Official NEET UG 2011 (C1)

What happens during fertilisation in humans after
many sperms reach close to the ovum?

Cells of corona radiata trap all the sperms except one
Only two sperms nearest the ovum penetrate zona pellucida
Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida
All sperms except the one nearest to the ovum lose their tails

Which one of the following is a possibility for most
of us in regard to breathing, by making a
conscious effort ?

One can consciously breathe in and breathe out by moving the diaphragm alone, without moving the ribs at all
The lungs can be made fully empty by forcefully breathing out all air from them
One can breathe out air totally without oxygen
One can breathe out air through eustachian tubes by closing both the nose and the mouth

The logistic population growth is expressed by the
equation

\(\frac{dN}{dt}\)= rN
\(\frac{dN}{dt}= rN [\frac{{K}-{N}}{N}]\)
\(\frac{dt}{dN}= Nr [\frac{{K}-{N}}{K}]\)
\(\frac{dN}{dt}= rN [\frac{{K}-{N}}{K}]\)

Which one of the following is essential for photolysis of water?

Copper
Boron
Manganese
Zinc

Ureters act as urinogenital ducts in

Frog’s both males and females
Frog’s males
Human males
Human females

Test cross in plants or in Drosophila involves crossing

The F \(_1\) hybrid with a double recessive genotype
Between two genotypes with dominant trait
Between two F \(_1\) hybrids

The breakdown of detritus into smaller particles by earthworm is a process called

Mineralisation
Catabolism
Humification
Fragmentation

A thin prism of angle 15° made of glass of refractive index \(\mu_1\) = 1.5 is combined with another prism of glass of refractive index \(\mu_2\) = 1.75. The combination of the prisms produces dispersion without deviation. The angle of the second prism should be

12°
5°
7°
10°

The unit of rate constant for a zero order reaction is

\(L^2 mol^{–2} s^{–1}\)
\(s^{–1}\)
\(mol L{–1} s{–1}\)
\(L mol^{–1} s^{–1}\)

Bulk of carbon dioxide (CO2) released from body
tissues into the blood is present as

70% carbamino-haemoglobin and 30% as bicarbonate
Carbamino-haemoglobin in RBCs
Bicarbonate in blood plasma and RBCs
Free CO2 in blood plasma

Read the following four statements (A-D) about certain mistakes in two of them
(A) The first tranrgenic buffalo Rosie produced milk which was human alpha-lactalbumin enriched
(B) Restriction enzymes are used in isolation of DNA from other macro-molecules
(C) Downstream processing is one of the steps of R-DNA technology
(D) Disarmed pathogen vectors are also used in transfer of R-DNA into the host
Which are the two statements having mistakes?

Statements (A) and (C)
Statements (A) and (B)
Statements (B) and (C)
Statements (C) and (D)

About which day in a normal human menstrual
cycle does rapid secretion of LH (Popularly called
LH-surge) normally occurs

5th day
11th day
14th day
20th day

What happens during fertilisation in humans after many sperms reach close to the ovum?

Cells of corona radiata trap all the sperms except one
Only two sperms nearest the ovum penetrate zona pellucida
Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona pellucida
All sperms except the one nearest to the ovum lose their tails

Which one of the following is a possibility for most of us in regard to breathing, by making a conscious effort ?

One can consciously breathe in and breathe out by moving the diaphragm alone, without moving the ribs at all
The lungs can be made fully empty by forcefully breathing out all air from them
One can breathe out air totally without oxygen
One can breathe out air through eustachian tubes by closing both the nose and the mouth

The logistic population growth is expressed by the equation

dN/dt = rN
dN/dt = rN \( (\frac{N-K}{N}) \)
dt/dN = Nr \( (\frac{K-N}{K}) \)
dN/dt = rN \( (\frac{K-N}{K}) \)

A galvanometer of resistance, G is shunted by a resistance S ohm. To keep the main current in the circuit unchanged, the resistance to be put in series with the galvanometer is

\(\frac{G^2}{(S+G)}\)
\(\frac{G}{(S+G)}\)
\(\frac{S^2}{(S+G)}\)
\(\frac{SG}{(S+G)}\)

Two identical piano wires, kept under the same tension T have a fundamental frequency of 600 Hz. The fractional increase in the tension of one of the wires which will lead to occurrence of 6 beats /s when both the wires oscillate together would be

0.04
0.01
0.02
0.03

\( A solution contains Fe2+, Fe^{3+} and I^– ions. This solution was treated with iodine at 35°C. E° for Fe^{3+}/Fe^{2+} is +0.77 V and E° for I_2/2I– = 0.536 V. The favourable redox reaction is \)

\( I^– will be oxidised to I_2 \)
\( Fe^{2+} will be oxidised to Fe^{3+} \)
\( I_2 will be reduced to I^– \)
There will be no redox reaction

In mitochondria, protons accumulate in the

Intermembrane space
Matrix
Outer membrane
Inner membrane

The pathogen Microsporum responsible for
ringworm disease in humans belongs to the same
Kingdom of organisms as that of

Rhizopus, a mould
Ascaris, a round worm
Taenia, a tapeworm
Wuchereria, a filarial worm

In history of bilogy, human genome project led to
the development of?

Bioinformatics
Biosystematics
Biotechnology
Biomonitoring

Bulk of carbon dioxide (CO \(_2\)) released from body tissues into the blood is present as

70% carbamino-haemoglobin and 30% as bicarbonate
Carbamino-haemoglobin in RBCs
Bicarbonate in blood plasma and RBCs
Free CO[mathjax] [latex]_2[/latex] in blood plasma

Read the following four statements (A-D) about certain mistakes in two of them

(A) The first tranrgenic buffalo Rosie produced milk which was human alpha-lactalbumin enriched
(B) Restriction enzymes are used in isolation of DNA from other macro-molecules
(C) Downstream processing is one of the steps of R-DNA technology
(D) Disarmed pathogen vectors are also used in transfer of R-DNA into the host
Which are the two statements having mistakes?

Statements (A) and (C)
Statements (A) and (B)
Statements (B) and (C)
Statements (C) and (D)

About which day in a normal human menstrual cycle does rapid secretion of LH (Popularly called LH-surge) normally occurs

5th day
11th day
14th day
20th day

A particle covers half of its total distance with speed v1 and the rest half distance with speed v2. Its average speed during the complete journey is

[mathjax] [latex]\frac{v^2_1v_2^2}{v^2_1 + v_2^2}[/latex]
[mathjax] [latex]\frac{v_1 + v_2}{2}[/latex]
[mathjax] [latex] \frac{v_1 v_2}{v_1 + v_2} [/latex]
[mathjax] [latex] \frac{2v_1 v_2}{v_1 + v_2} [/latex]

The electric potential V at any, point (x, y, z), in meters in space is given by V = 4x \(^2\) volt. The electric field at the point (1, 0, 2) in volt/meter, is

16 along positive X-axis
8 along negative X-axis
8 along positive X-axis
16 along negative X-axis

\( 200 mL of an aqueous solution of a protein contains its 1.26 g. The Osmotic pressure of this
solution at 300 K is found to be 2.57 × 10^{–3} bar. The molar mass of protein will be (R = 0.083 L bar mol^{–1} K^{–1}) \)

31011 g mol \(^{-1}\)
61038 g mol \(^{-1}\)
51022 g mol \(^{-1}\)
122044 g mol \(^{-1}\)

The unequivocal proof of DNA as the genetic
material came from the studies on a

Viroid
Bacterial virus
Bacterium
Fungus

Which one of the following techniques made it
possible to genetically engineer living organisms?

Heavier isotope labelling
Hybridization
Recombinant DNA techniques
X-ray diffraction

Which one of the following correctly represents the
normal adult human dental formula?

\(\frac{2}{2},\frac{1}{1},\frac{2}{2},\frac{3}{3}\)
\(\frac{3}{3},\frac{1}{1},\frac{3}{3},\frac{3}{3}\)
\(\frac{3}{3},\frac{1}{1},\frac{3}{2},\frac{1}{1}\)
\(\frac{2}{2},\frac{1}{1},\frac{3}{2},\frac{3}{3}\)

In mitochondria, protons accumulate in the

Intermembrane space
Matrix
Outer membrane
Inner membrane

The pathogen Microsporum responsible for ringworm disease in humans belongs to the same Kingdom of organisms as that of

Rhizopus, a mould
Ascaris, a round worm
Taenia, a tapeworm
Wuchereria, a filarial worm

In history of bilogy, human genome project led to the development of?

Bioinformatics
Biosystematics
Biotechnology
Biomonitoring

A thermocouple of negligible resistance produces an e.m.f. of 40 \( \mu \)V/°C in the linear range of temperature. A galvanometer of resistance 10 ohm whose sensitivity is 1 \( \mu\)A/div, is employed with the thermocouple. The smallest value of temperature difference that can be detected by the system will be

0.1°C
0.25°C
0.5°C
1°C

A particle of mass m is thrown upwards from the surface of the earth, with a velocity u. The mass and the radius of the earth are, respectively, M and R.G is gravitational constant and g is acceleration due to gravity on the surface of the earth. The minimum value of u so that the particle does not return back to earth, is

\(\sqrt{2gR^2}\)
\(\sqrt{\frac{2GM}{R^2}}\)
\(\sqrt{\frac{2GM}{R}}\)
\(\sqrt{\frac{2gM}{R^2}}\)

\( The half-life of a substance in a certain enzyme – catalysed reaction is 138 s. The time required for the concentration of the substance to fall from 1.28 mg L^{–1} to 0.04 mg L^{–1} is \)

690 s
276 s
414 s
552 s

Whorled simple leaves with reticulate venation are
present in

China Rose
Alstonia
Calotropis
Neem

“Good ozone” is found in the

Stratosphere
Ionosphere
Mesorphere
Troposphere

The type of muscles present in our

Thigh are striated and voluntary
Upper arm are smooth muscle fibres fusiform in shape
Heart are involuntary and unstriated smooth muscles
Intestine are striated and involuntary

The unequivocal proof of DNA as the genetic material came from the studies on a

Viroid
Bacterial virus
Bacterium
Fungus

Which one of the following techniques made it possible to genetically engineer living organisms?

Heavier isotope labelling
Hybridization
Recombinant DNA techniques
X-ray diffraction

Which one of the following correctly represents the normal adult human dental formula?

\(\frac{2}{2}\frac{1}{1}\frac{2}{2}\frac{3}{3}\)
\(\frac{3}{3}\frac{1}{1}\frac{3}{2}\frac{1}{1}\)
\(\frac{3}{3}\frac{1}{1}\frac{3}{3}\frac{3}{3}\)
\(\frac{2}{2}\frac{1}{1}\frac{3}{2}\frac{3}{3}\)

A mass m moving horizontally (along the x-axis) with velocity v collides and sticks to a mass of 3m moving vertically upward (along the y-axis) with velocity 2v. The final velocity of the combination is

\(\frac{2}{3}v\hat{i}+\frac{1}{3}v\hat{j}\)
\(\frac{3}{2}v\hat{i}+\frac{1}{4}v\hat{j}\)
\(\frac{1}{4}v\hat{i}+\frac{3}{2}v\hat{j}\)
\(\frac{1}{3}v\hat{i}+\frac{2}{3}v\hat{j}\)

A projectile is fired at an angle of 45° with the horizontal. Elevation angle of the projectile at its highest point as seen from the point of projection is

\(tan^- (\frac{\sqrt{3}}{2})\)
45°
60°
\(tan^{-1}\frac{1}{2}\)

Which of the following complex compounds will exhibit highest paramagnetic behaviour?

\( [Co(NH_3)_6]^{3+} \)
\( [Zn(NH_3)_6]^{2+} \)
\( [Ti(NH_3)_6]^{3+} \)
\( [Cr(NH_3)_6]^{3+} \)

What is common between vegetative reproduction
and Apomixis?

Both occur round the year
Both produces progeny identical to the parent
Both are applicable to only dicot plants
Both bypass the flowering phase

Guttation is the result of

Osmosis
Root pressure
Diffusion
Transpiration

Which one of the following is not an essential mineral element for plants while the remaining three are?

Cadmium
Phosphorus
Iron
Manganese

Whorled simple leaves with reticulate venation are present in

China Rose
Alstonia
Calotropis
Neem

“Good ozone” is found in the

Stratosphere
Ionosphere
Mesorphere
Troposphere

The type of muscles present in our

Thigh are striated and voluntary
Upper arm are smooth muscle fibres fusiform in shape
Heart are involuntary and unstriated smooth muscles
Intestine are striated and involuntary

A converging beam of rays is incident on a diverging lens. Having passed through the lens the rays intersect at a point 15 cm from the lens on the opposite side. If the lens is removed the point where the rays meet will move 5 cm closer to the lens. The focal length of the lens is

–30 cm
5 cm
–10 cm
20 cm

A coil has resistances 30 ohm and inductive reactance 20 Ohm at 50 Hz frequency. If an ac source, of 200 volt, 100 Hz is connected across the coil, the current in the coil will be

2.0 A
3.0 A
4.0 A
8.0 A

A solid compound XY has NaCl structure. If the radius of the cation is 100 pm, the radius of the anion (Y \(^-\)) will be

241.5 pm
165.7 pm
275.1 pm
322.5 pm

Which one of the following conditions of the zygotic
cell would lead to the birth of a normal human
female child?

Only one X chromosome
One X and one Y chromosome
Two X chromosome
Only one Y chromosome

Biodiversity of a geographical region represents

Genetic diversity present in the dominant species of the region
Species endemic to the region
Endangered species found in the region
The diversity in the organisms living in the region

Consider the following four statements whether they are correct or wrong?
(A) The sporophyte in liverworts is more elaborate than that in mosses
(B) Salvinia is heterosporous
(C) The life-cycle in all seed bearing plants is diplontic
(D) In Pinus male and female cones are borne on different treesConsider the following four statements whether they are correct or wrong?
The two wrong statements together are

Statements (B) and (C)
Statements (A) and (B)
Statements (A) and (C)
Statements (A) and (D)

Three of the following pairs of the human skeletal parts are correctly matched with their respective inclusive skeletal category and one pair is not matched. Identify the non-matching pair.

Sort elements

Pelvic girdle
Axial skeleton

Clavicle and Glenoid cavity
Sternum and Ribs

Guttation is the result of

Osmosis
Root pressure
Diffusion
Transpiration

Consider the following four statements whether they are correct or wrong?

(A) The sporophyte in liverworts is more elaborate than that in mosses
(B) Salvinia is heterosporous
(C) The life-cycle in all seed bearing plants is diplontic
(D) In Pinus male and female cones are borne on different trees
The two wrong statements together are

Statements (B) and (C)
Statements (A) and (B)
Statements (A) and (C)
Statements (A) and (D)

The threshold frequency for a photosensitive metal is 3.3 × 1014 Hz. If light of frequency 8.2 × 1014 Hz is incident on this metal, the cut-off voltage for the photoelectric emission is nearly

5 V
1 V
2 V
3 V

The density of a material in CGS system of units is 4 g/cm \(^3\). In a system of units in which unit of length is 10 cm and unit of mass is 100 g, the value of density of material will be

400
0.04
0.4
40

Which of the following is not a fat soluble vitamin?

Vitamin E
Vitamin A
Vitamin B complex
Vitamin D

The 24 hour (diurnal) rhythm of our body such as
the sleep-wake cycle is regulated by the hormone.

Adrenaline
Melatonin
Calcitonin
Prolactin

At metaphase, chromosomes are attached to the
spindle fibres by their

Kinetochores
Centromere
Satellites
Secondary constrictions

Consider the following four statements (A-D) related to the common from Rana tigrina, and select the correct option stating which ones are true (T) and which ones are false (F).Statements:(A) One dry land it would die due to lack of O2 if its mouth is forcibly kept closed for a few days.(B) It has four chambered heart.(C) On dry land it turns uricotelic from ureotelic.(D) Its life history is carried out in pond water.
Options

(A) F (B) F (C) T (D) T
(A) F (B) T (C) T (D) F
(A) T (B) F (C) F (D) T (C) (D)
(A) T (B) T (C) F (D) F

What is common between vegetative reproduction and Apomixis?

Both occur round the year
Both produces progeny identical to the parent
Both are applicable to only dicot plants
Both bypass the flowering phase

Biodiversity of a geographical region represents

Genetic diversity present in the dominant species of the region
Species endemic to the region
Endangered species found in the region
The diversity in the organisms living in the region

Which one of the following is not an essential mineral element for plants while the remaining three are?

Cadmium
Phosphorus
Iron
Manganese

An electron in the hydrogen atom jumps from excited state n to the ground state. The wavelength so emitted illuminates a photosensitive material having work function 2.75 eV. If the stopping potential of the photoelectron is 10 V, then the value of n is

5
2
3
4

Match the composition of substances and select the correct answer using the code given below the lists

Sort elements

\(CaSO_4\frac{1}{2}H_2O\)
\(MgSO_4 7 H_2O\)
\(MgSO_4 H_2O\)
\(CaSO_4 2 H_2O\)

Plaster of paris
Epsomite
Kieserite
Gypsum

Which has the maximum number of molecules among the following?

8 g H \(_2\)
64 g SO \(_2\)
44 g CO \(_2\)
48 g O \(_3\)

Which one of the following pairs is wrongly
matched while the remaining three are correct?

Bryophyllum – Leaf buds
Agave – Bulbils
Penicillium – Conidia
Water hyacinth – Runner

Which one of the following is a wrong matching of
a microbe and its industrial product, while the
remaining three are correct?

Clostridium butylicum – lactic acid
Aspergillus niger – citric acid
Yeast – statins
Acetobacter aceti – acetic acid

In angiosperms, functional megaspore develops into

Endosperm
Pollen sac
Embryo sac
Ovule

Read the following statement having two blanks (A and B)
“A drug used for _______(A) patients is obtained from a species of the organism _______(B) .” The one correct option for the two blanks is

Swine flu Monascus
AIDS Pseudomonas
Heart Penicillium
Organ-transplant Trichoderma

At metaphase, chromosomes are attached to the spindle fibres by their

Kinetochores
Centromere
Satellites
Secondary constrictions

Consider the following four statements (A-D) related to the common from Rana tigrina, and select the correct option stating which ones are true (T) and which ones are false (F). Statements:
(A) One dry land it would die due to lack of O2 if its mouth is forcibly kept closed for a few days.
(B) It has four chambered heart.
(C) On dry land it turns uricotelic from ureotelic.
(D) Its life history is carried out in pond water. Options :

F F T T
F T T F
T F F T
T T F F

A particle of mass M is situated at the centre of a spherical shell of same mass and radius a. The magnitude of the gravitational potential at a point situated at a/2 distance from the centre, will be

\( \frac{4GM}{a}\)
\( \frac{GM}{a}\)
\( \frac{2GM}{a}\)
\( \frac{3GM}{a}\)

Which of the following statements is incorrect?

Aluminium reacts with excess NaOH to give Al(OH) \(_3\)
NaHCO \(_3\) on heating gives Na \(_2\)CO \(_3\)
Pure sodium metal dissolves in liquid ammonia to give blue solution
NaOH reacts with glass to give sodium silicate

Match the compounds

Sort elements

Benzoin condensation
Phenolphthalein
Fries rearrangement
Oil of wintergreen

Benzaldehyde
Phthalic anhydride
Phenyl benzoate
Methyl salicylate

Read the following statement having two blanks
(A and B)
“A drug used for (A) patients is obtained
from a species of the organism (B) .”
The one correct option for the two blanks is

Blank-A Swine flu Blank-B Monascus
Blank-A AIDS Blank-B Pseudomonas
Blank-A Hearz Blank-B Penicillium
Blank-A Organ-transplant Blank-B Trichoderma

Silencing of mRNA has been used in producing
tranrgenic plants resistant to

White rusts
Bacterial blights
Bollworms
Bollworms

Which one of the following aspects is an exclusive characteristic of living things?

Perception of events happening in the environment and their memory
Increase in mass by accumulation of material both on surface as well as internally
Isolated metabolic reactions occur in vitro
Increase in mass from inside only

Which one of the following conditions of the zygotic cell would lead to the birth of a normal human female child?

Only one X chromosome
One X and one Y chromosome
Two X chromosome
Only one Y chromosome

Which one of the following is a wrong matching of a microbe and its industrial product, while the remaining three are correct?

Clostridium butylicum – lactic acid
Aspergillus niger – citric acid
Yeast – statins
Acetobacter aceti – acetic acid

In angiosperms, functional megaspore develops into

Endosperm
Pollen sac
Embryo sac
Ovule

Two particles are oscillating along two close parallel straight lines side by side, with the same frequency and amplitudes. They pass each other, moving in opposite directions when their displacement is half of the amplitude. The mean positions of the two particles lie on a straight line perpendicular to the paths of the two particles. The phase difference is

\(\pi\)
\(\frac{\pi}{6}\)
0
\(\frac{2 \pi}{3}\)

Which of the statements about “Denaturation” given below are correct?
Statements :
(a) Denaturation of proteins causes loss of secondary and tertiary structures of the protein
(b) Denaturation leads to the conversion of double strand of DNA into single strand
(c) Denaturation affects primary structure which gets distorted

(a) and (b)
(a), (b) and (c)
(b) and (c)
(a) and (c)

\( What is the value of electron gain enthalpy of Na^+ if IE_1 of Na = 5.1 eV? \)

+2.55 eV
+10.2 eV
–5.1 eV
–10.2 eV

The cells lining the blood vessels belong to the category of

Columnar epithelium
Connective tissue
Smooth muscle tissue
Squamous epithelium

15. Read the following statement having two blanks
(A and B)
“A drug used for (A) patients is obtained
from a species of the organism (B) .”
The one correct option for the two blanks is

Blank-A Swine flu Blank-B Monascus
Blank-A AIDS Blank-B Pseudomonas
Blank-A Heart Blank-B Penicillium
Blank-A Organ-transplant Blank-B Trichoderma

Which one of the following statements is totally
wrong about the occurrence of notochord while the
other three are correct

It is absent throughtout life in humans from the very beginning
It is present througout life in Amphioxus
It is present only in larval tail in Ascidians
It is replaced by a vertebral column in adult frog

Some vascular bundles are described as open because these

Possess conjunctive tissue between xylem and phloem
Are not surrounded by pericycle
Are surrounded by pericycle but no endodermis
Are capable of producing secondary xylem and phloem

The 24 hour (diurnal) rhythm of our body such as the sleep-wake cycle is regulated by the hormone.

Adrenaline
Melatonin
Calcitonin
Prolactin

Silencing of mRNA has been used in producing tranrgenic plants resistant to

White rusts
Bacterial blights
Bollworms
Nematodes

Which one of the following aspects is an exclusive characteristic of living things?

Perception of events happening in the environment and their memory
Increase in mass by accumulation of material both on surface as well as internally
Isolated metabolic reactions occur in vitro
Increase in mass from inside only

A conveyor belt is moving at a constant speed of 2 m/s. A box is gently dropped on it. The coefficient of friction between them is \(\mu\) = 0.5. The distance that the box will move relative to belt before coming to rest on it, taking g = 10 ms \(^{-2}\), is

Zero
0.4 m
1.2 m
0.6 m

Which of the following oxide is amphoteric?

SiO \(_2\)
CO \(_2\)
SnO \(_2\)
CaO

Which of the following carbonyls will have the strongest C – O bond?

V(CO) \(^-_6\)
Fe(CO) \(_5\)
Mn(CO) \(^(6+)\)
Cr(CO) \(_6\)

Consider the following statements (A-D) about organic farming
A. Utilizes genetically modified crops like Bt cotton
B. Uses only naturally produced inputs like compost
C. Does not use pesticides and urea
D. Produces vegetables rich in vitamins and minerals
Which of the above statements are correct?

(1) (B) and (C) only
(A) and (B) only
(3) (B), (C) and (D)
(4) (C) and (D) only

Function of companion cells is

Loading of sucrose into sieve elements by passive transport
Loading of sucrose into sieve elements
Providing energy to sieve elements for active transport
Providing water to phloem

The technique called gamete intrafallopian transfer
(GIFT) is recommended for those females

Whore cervical canal is too narrow to allow passage for the sperms
Who cannot provide suitable environment for fertilisation
Who cannot produce an ovum
Who cannot retain the foetus inside uterus

The cells lining the blood vessels belong to the category of

Columnar epithelium
Connective tissue
Smooth muscle tissue
Squamous epithelium

Which one of the following pairs is wrongly matched while the remaining three are correct?

Bryophyllum – Leaf buds
Agave – Bulbils
Penicillium – Conidia
Water hyacinth – Runner

Which one of the following statements is totally wrong about the occurrence of notochord while the other three are correct

It is absent throughtout life in humans from the very beginning
It is present througout life in Amphioxus
It is present only in larval tail in Ascidians
It is replaced by a vertebral column in adult frog

Some vascular bundles are described as open because these

Possess conjunctive tissue between xylem and phloem
Are not surrounded by pericycle
Are surrounded by pericycle but no endodermis
Are capable of producing secondary xylem and phloem

A mass of diatomic gas ( = 1.4) at a pressure of 2 atmospheres is compressed adiabatically so that its temperature rises from 27°C to 927°C. The pressure of the gas in the final state is

256 atm
8 atm
28 atm
68.7 atm

A bubble of air is underwater at temperature 15°C and the pressure 1.5 bar. If the bubble rises to the surface where the temperature is 25°C and the pressure is 1.0 bar what will happen to the volume of the bubble?

Volume will become smaller by a factor of 0.70
Volume will become greater by a factor of 2.5
Volume will become greater by a factor of 1.6
Volume will become greater by a factor of 1.1

The pairs of species of oxygen and their magnetic behaviours are noted below. Which of the following presents the correct description?

Sort elements

Both paramagnetic
Both diamagnetic
Both paramagnetic
Both paramagnetic

\( O_2^+, O_2 \)
\( O, O_2^{2–} \)
\( O_2^–, O_2^{2–} \)
\( O^+, O_2^{2+} \)

Select the correct statement with respect to
diseases and immunisation

(1) Certain protozoans have been used to mass produce hepatitis B vaccine
(2) Injection of snake antivenom against snake bite is an example of active immunisation
(3) If due to some reason B-and T-lymphocytes are damaged, the body will not produce antibodies against a pathogen
(4) Injection of dead / inactivated pathogens causes passive immunity

Which one of the following is not considered as a
part of the endomembrane system?

Vacuole
Lysosome
Golgi complex
Peroxisome

Common cold is not cured by antibiotics because it
is

Caused by a Gram-negative bacterium
Not an infectious disease
Caused by a virus
Caused by a Gram-positive bacterium

Consider the following statements (A-D) about organic farming
A. Utilizes genetically modified crops like Bt cotton
B. Uses only naturally produced inputs like compost
C. Does not use pesticides and urea
D. Produces vegetables rich in vitamins and minerals
Which of the above statements are correct?

(B) and (C) only
(A) and (B) only
(B), (C) and (D)
(C) and (D) only

Function of companion cells is

Loading of sucrose into sieve elements by passive transport
Loading of sucrose into sieve elements
Providing energy to sieve elements for active transport
Providing water to phloem

The technique called gamete intrafallopian transfer (GIFT) is recommended for those females

Whore cervical canal is too narrow to allow passage for the sperms
Who cannot provide suitable environment for fertilisation
Who cannot produce an ovum
Who cannot retain the foetus inside uterus

Bacillus thuringiensis forms protein crystals which contain insecticidal protein.
This protein :

Is activated by acid pH of the foregut of the insect pest
Does not kill the carrier bacterium which is itself resistant to this toxin
Binds with epithelial cells of midgut of the insect pest ultimately killing it
Is coded by several genes including the gene cry

Charge q is uniformly spread on a thin ring of radius R. The ring rotates about its axis with a uniform frequency f Hz. The magnitude of magnetic induction at the center of the ring is :

\(\frac{\mu_0 q}{2\pi fR}\)
\(\frac{\mu_0 qf}{2\pi R}\)
\(\frac{\mu_0 qf}{2 fR}\)
\(\frac{\mu_0 qf}{2R}\)

Consider the following process

\(\Delta\)H(kJ/mol)

\(\frac{1}{2}A \to B\) + 150

\(3B \to 2C + D \) – 125

\(E + A \to 2D\) + 350

\(For B + D \to E + 2, \Delta H will be\)

– 325 kJ/mol
325 kJ/mol
525 kJ/mol
– 175 kJ/mol

According to the Bohr Theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon?

n = 6 to n = 5
n = 5 to n = 3
n = 6 to n = 1
n = 5 to n = 4

Selaginella and Salvinia are considered to represent
a significant step toward evolution of seed habit
because

Megaspores possess endosperm and embryo surrounded by seed coat
Embryo develops in female gametophyte which is retained on parent sporophyte
Female gametophyte is free and gets dispersed like seeds
Female gametophyte lacks archegonia

In Kranz anatomy, the bundle sheath cells have

Thin walls, no intercellular spaces and several chloroplasts
Thick walls, many intercellular spaces and few chloroplasts
Thin walls, many intercellular spaces and no chloroplasts
Thick walls, no intercellular spaces and large number of chloroplasts

Which one of the following options gives the
correct matching of a disease with its causative
organism and mode of infection

Desease : Elephantiasis Causative Organisms : Wuchereria bancrofti Mode of Ifection : With infected water and food
Desease : Malaria Causative Organisms : Plasmodium vivax Mode of Ifection : Bite of male Anopheles mosquito
Desease :Typhoid Causative Organisms :Salmonella typhi Mode of Ifection :With inspired air
Desease :Pneumonia Causative Organisms :Streptococcus Pneumoniae Mode of Ifection :Droplet infection

Select the correct statement with respect to diseases and immunisation

Certain protozoans have been used to mass produce hepatitis B vaccine
Injection of snake antivenom against snake bite is an example of active immunisation
If due to some reason B-and T-lymphocytes are damaged, the body will not produce antibodies against a pathogen
Injection of dead / inactivated pathogens causes passive immunity

Which one of the following is not considered as a part of the endomembrane system?

Vacuole
Lysosome
Golgi complex
Peroxisome

Common cold is not cured by antibiotics because it is

Caused by a Gram-negative bacterium
Not an infectious disease
Caused by a virus
Caused by a Gram-positive bacterium

One of the constituents of the pancreatic juice while poured into the duodenum in humans is

Trypsin
Enterokinase
Trypsinogen
Chymotrypsin

Out of the following which one is not a possible energy for a photon to be emitted by hydrogen atom according to Bohr’s atomic model?

13.6 eV
0.65 eV
1.9 eV
11.1 eV

A 0.1 molal aqueous solution of a weak acid is 30% ionized. If Kf for water is 1.86°C/m, the freezing point of the solution will be

– 0.36°C
– 0.24°C
– 0.18°C
– 0.54°C

Consider the reactions :

\( (CH_3)_2 CH – CH_2 Br\xrightarrow{C_2H_5 OH} (CH_3)_2 CH – CH_2 OC_2 H_5 -HBr \)

\( (CH_3)_2 CH – CH_2 Br\xrightarrow{C_2H_5 O^-} (CH_3)_2 CH – CH_2 OC_2 H_5 + Br^- \)

The mechanisms of reactions (i) and (ii) are respectively

\( S_N2 and S_N2 \)
\( S_N2 and S_N1 \)
\( S_N1 and S_N2 \)
\( S_N1 and S_N1 \)

5. Which one of the following animals may occupy
more than one trophic levels in the same ecosystem
at the same time?

(1) Goat
(2) Frog
(3) Sparrow
(4) Lion

Sweet potato is homologous to

Ginger
Turnip
Potato
Colocasia

Frogs differ from humans in possessing

Nucleated red blood cells
Thyroid as well as parathyroid
Paired cerebral hemispheres
Hepatic portal system

Selaginella and Salvinia are considered to represent a significant step toward evolution of seed habit because

Megaspores possess endosperm and embryo surrounded by seed coat
Embryo develops in female gametophyte which is retained on parent sporophyte
Female gametophyte is free and gets dispersed like seeds
Female gametophyte lacks archegonia

In Kranz anatomy, the bundle sheath cells have

Thin walls, no intercellular spaces and several chloroplasts
Thick walls, many intercellular spaces and few chloroplasts
Thin walls, many intercellular spaces and no chloroplasts
Thick walls, no intercellular spaces and large number of chloroplasts

Which one of the following options gives the correct matching of a disease with its causative organism and mode of infection

Elephan-tiasis Wuchereria bancrofti With infected water and food
Pneumonia Streptococcus Pneumoniae Droplet infection

Which one of the following structures in Pheretima is correctly matched with its function?

Setae-defence against predators
Typhlosole – storage of extra nutrients
Clitellum – secretes cocoon
Gizzard – absorbs digested food

Two radioactive nuclei P and Q in a given sample decay into a stable nucleus R. At time t = 0, number of P species are 4N \(_0\) and that of Q are N \(_0\). Half-life of P (for conversion to R) is 1 minute whereas that of Q is 2 minutes. Initially there are no nuclei of R present in the sample. When number of nuclei of P and Q are equal the number of nuclei of R present in the sample would be :

\(\frac{5N_0}{2}\)
\(\frac{9N_0}{2}\)
\(2N_0\)
\(3N_0\)

The following reactions take place in the blast furnace in the preparation of impure iron. Identify the reaction pertaining to the formation of the slag.

\(CaO(s) + SiO_2(s) \to CaSiO_3(s)\)
\( 2C(s) + O_2(g) \to 2CO(g)\)
\( Fe_2O_3(s) + 3CO(g) \to 2Fe(l) + 3CO_2(g)\)
\( CaCO_3(s) \to CaO(s) + CO_2(g) \)

Which one of the following is essential for
photolysis of water?

Copper
Boron
Manganese
Zinc

Ureters act as urinogenital ducts in

Frog’s both males and females
Frog’s males
Human males
Human females

Test cross in plants or in Drosophila involves crossing

The F1 hybrid with a double recessive genotype
Between two genotypes with dominant trait
Between two genotypes with recessive trait
Between two F1 hybrids

Which one of the following animals may occupy more than one trophic levels in the same ecosystem at the same time?

Goat
Frog
Sparrow
Lion

Sweet potato is homologous to

Ginger
Turnip
Potato
Colocasia

Frogs differ from humans in possessing

Nucleated red blood cells
Thyroid as well as parathyroid
Paired cerebral hemispheres
Hepatic portal system

Both, hydrarch and xerarch successions lead to

Highly dry conditions
Excessive wet conditions
Medium water conditions
Xeric conditions

\(Pure Si at 500 K has equal number of electron (n_e) and hole (n_h) concentrations of 1.5 × 10^{16}m^{–3}. Doping by indium increases nh to 4.5 × 10^{22} m^{–3}. The doped semiconductor is of : \)

n-type with electron concentration \(n_e = 2.5 × 10^{23} m^{–3} \)
p-type having electron concentrations \(n_e = 5 × 10^{9} m^{–3} \)
p-type with electron concentration \(n_e = 2.5 × 10^{22} m^{–3} \)
n-type with electron concentration \(n_e = 2.5 × 10^{10} m^{–3} \)

\( In qualitative analysis, the metals of group I can be separated from other ions by precipitating them as chloride salts. A solution initially contains Ag^+ and Pb^{2+} at a concentration is 0.10 M. Aqueous HCl is added to this solution until the Cl^– concentration is 0.10 M. What will the concentration of Ag^+ and Pb^{2+} be at equilibrium? (K_{sp} for AgCl = 1.8 × 10^{–10}, K_{sp} for PbCl_2 = 1.7 × 10^{–5}) \)

\( [Ag^+] = 1.8 × 10^{–9} M \)
\( [Pb^{2+}] = 1.7 × 10^{–3} M \)
\( [Ag^+] = 1.8 × 10^{–7} M \)
\( [Pb^{2+}] = 1.7 × 10^{–4} M \)
\( [Ag^+] = 1.8 × 10^{–11} M \)
\( [Pb^{2+}] = 1.7 × 10^{–4} M \)
\( [Ag^+] = 1.8 × 10^{–11} M \)
\( [Pb^{2+}] = 1.7 × 10^{–5} M \)