Biology I - Section A
1. Niche of an organism includes:
I: |
range of conditions that it can tolerate |
II: |
diversity in the resources it utilises |
III: |
its distinct functional role in the ecological system |
1. |
Only I |
2. |
Only III |
3. |
Only II and III |
4. |
I, II and III |
2. The outside of the epidermis in plant body is often covered with a waxy thick layer called the cuticle which:
I: prevents the loss of water.
II: is present in roots.
1. I is correct; II is correct
2. I is incorrect; II is correct
3. I is incorrect; II is incorrect
4. I is correct; II is incorrect
3. In the ‘Regeneration’ stage of the Calvin cycle:
1. |
Five G3P molecules produce three RuBP molecules, using up three molecules of ATP. |
2. |
Three G3P molecules produce five RuBP molecules, using up three molecules of ATP. |
3. |
Three G3P molecules produce five RuBP molecules, using up five molecules of ATP. |
4. |
Five G3P molecules produce three RuBP molecules, using up five molecules of ATP. |
4. All the following are floral characteristics of plants belonging to the Gramineae family except:
1. Flowers are characteristically arranged in spikelets
2. The flowers are usually unisexual
3. The perianth is reduced to two scales, called lodicules
4. The fruit is a caryopsis
5. The detritus food chain:
I: |
begins with dead organic matter |
II: |
is the major conduit of energy flow in aquatic ecosystem. |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
6. The site of production of NADPH and ATP in a plant cell is:
1. matrix of the mitochondria
2. cristae of the mitochondria
3. stroma of the chloroplast
4. thylakoid membranes of the chloroplast
7. Glomus is:
1. |
the genus of fungus, the members of which help symbiont plants get phosphorus |
2. |
the genus of fungus, the members of which help symbiont plants get nitrogen |
3. |
the genus of plants, the members of which are symbionts of mycorrhizae |
4. |
the genus of fungus, the members of which help processing of certain varieties of cheese |
8. Identify the incorrectly matched pair:
|
Bio-control agent |
Pest controlled |
1. |
Lady bird |
Aphids |
2. |
Dragon fly |
Mosquito |
3. |
Trichoderma |
Fungi |
4. |
Baculoviruses |
Nematodes |
9. Ubiquinone receives reducing equivalents via:
I. Complex I |
II. Complex II |
III. Complex III |
1. |
Only I |
2. |
Only I and II |
3. |
Only I and III |
4. |
I, II and III |
10. Wind-pollinated flowers are characterized by the following, except:
1. |
Light and non-sticky pollen grains |
2. |
Well-exposed stamens |
3. |
Many ovules in each ovary |
4. |
Large, often-feathery stigma |
11. Identify the correct statements regarding G1 phase of the cell cycle:
I: |
It is the post-mitotic gap phase |
II: |
The cell is metabolically active and grows continuously |
III: |
Cell replicates its DNA |
1. |
Only II |
2. |
I and II only |
3. |
Only I |
4. |
I, II and III |
12. When a threatened plant needs urgent measures to save it from extinction, the desirable approach is:
1. |
in-situ conservation |
2. |
ex-situ conservation |
3. |
cryopreservation |
4. |
biopreservation |
13. The central dogma of molecular biology was proposed by:
1. |
Francis Crick |
2. |
James Watson |
3. |
Rosalind Franklin |
4. |
Erwin Chargaff |
14. Identify the incorrect statement/s:
Statement I: |
Stamens are epipetalous in the flowers of lily. |
Statement II: |
Diadelphous stamen are seen in citrus. |
Statement III: |
A sterile stamen is called as staminate. |
1. |
Only Statement I and Statement II |
2. |
Only Statement III |
3. |
Statement I, Statement II and Statement III |
4. |
Only Statement I and Statement III |
15. Scutellum is:
1. |
shield shaped cotyledon in monocotyledons |
2. |
protein layer in the outer endosperm in monocotyledons |
3. |
starchy endosperm of dicotyledons |
4. |
stony hard seed coat in some seeds |
16. Fruit juices can be clarified with the use of:
1. |
Lipases |
2. |
Papain |
3. |
Pectinase and protease |
4. |
Glucoamylase |
17. The work of which of the following scientists led to the establishment of the discipline of modern biotechnology?
1. |
Banting and Best |
2. |
Bolivar and Rodriguez |
3. |
Hershey and Chase |
4. |
Cohen and Boyer |
18. C. B. van Niel proved that:
1. |
Plants produce glucose when they grow. |
2. |
Blue and red light are effective for photosynthesis. |
3. |
It is only the green parts of the plants that could release oxygen. |
4. |
Hydrogen from a suitable oxidizable compound reduces carbon dioxide to carbohydrates. |
19. Phloem fibers [bast fibers] are:
1. |
made up of collenchyma and generally not seen in primary phloem |
2. |
made up of collenchyma and generally not seen in secondary phloem |
3. |
made up of sclerenchyma and generally not seen in primary phloem |
4. |
made up of sclerenchyma and generally not seen in secondary phloem |
20. Consider the given two statements:
Statement 1: |
Certain amino acids are essential for our health. |
Statement 2: |
Only such amino acids are used to make proteins in our body according to our own genetic code. |
1. |
Both Statement 1 and Statement 2 are correct and Statement 2 correctly explains Statement 1 |
2. |
Both Statement 1 and Statement 2 are correct but Statement 2 does not correctly explain Statement 1 |
3. |
Statement 1 is correct but Statement 2 is incorrect |
4. |
Statement 1 is incorrect but Statement 2 is correct |
21. Which of the following does not relate to heterotrophic bacteria?
1. |
They are important decomposers. |
2. |
They are helpful in making curd from milk, production of antibiotics and fixing nitrogen in legume roots. |
3. |
Some are pathogens causing damage to human beings, crops, farm animals and pets. |
4. |
Almost all help in recycling nutrients like nitrogen, phosphorus, iron and sulphur. |
22. The number of correct statements from the given statements is:
a. Wheat belongs to the Order ‘Sapindales’.
b. Housefly belongs to the Order ‘Hymenoptera’.
c. Mango belongs to the Class ‘Monocotyledonae’.
d. Man belongs to the Family ‘Primata’.
1. 0
2. 1
3. 3
4. 4
23. Regarding Marchantia:
I: |
The thallus is dorsi-ventral and closely appressed to the substrate. |
II: |
The plant is monoecious. |
1. |
Both I and II are incorrect |
2. |
Only I is incorrect |
3. |
Only I is correct |
4. |
Both I and II are correct |
24. Bacillus thuringiensis (Bt) strains have been used to design novel:
1. |
Biofertilizers |
2. |
Biometallurgic techniques |
3. |
Biomineralization processes |
4. |
Bioinsecticidal plants |
25. Regarding the gradients of biodiversity:
I: |
As we move from poles to the equator, broadly speaking, biodiversity decreases. |
II: |
There is an increase in species diversity from lower to higher altitudes. |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
26. Identify the incorrectly matched pair:
1. |
Golden rice |
Vitamin B12 enriched rice |
2. |
Rosie |
First transgenic cow |
3. |
Bt Cotton |
Genetically modified pest resistant plant cotton variety |
4. |
Basmati controversy |
Biopiracy |
27. In the anaerobic sludge digesters during sewage water treatment:
1. |
The primary sludge is treated with aerobic microbes and activated sludge is created |
2. |
The primary sludge is treated with anaerobic microbes and activated sludge is created |
3. |
The activated sludge is digested by anaerobic microbes producing biogas during the process |
4. |
The activated sludge is digested by aerobic microbes producing biogas during the process |
28. The correct sequence of flow of electrons in the light reaction is
1. |
PSII, plastoquinone, cytochromes, PS I, ferredoxin |
2. |
PSI, plastoquinone, cytochromes, PS II, ferredoxin |
3. |
PSI, ferredoxin, PS II, |
4. |
PSI, plastoquinone, cytochromes, PS II, ferredoxin |
29. What radioactive isotope was used by Meselson and Stahl to label DNA in their experiment?
1. |
35S |
2. |
15N |
3. |
32P |
4. |
None |
30. A polysome is:
1. |
several mRNA molecules attached to a ribosome |
2. |
several ribosomes attached to a single mRNA |
3. |
the three major types of cellular RNAs attached to an mRNA molecule |
4. |
many ribosomes attached to the surface of endoplasmic reticulum |
31. Callus from internodal segments of tobacco stem gets proliferated only if in addition to one of the following – extracts of vascular tissues, yeast extract, coconut milk or DNA, the nutrient medium also contains:
1. Auxins |
2. Gibberellins |
3. ABA |
4. Ethylene |
32. Which of the following is the correct description of an anther?
1. |
Pollen sac |
2. |
The pollen-producing reproductive organ of a flower |
3. |
The male gametophyte of angiosperms |
4. |
The part of a stamen that contains the pollen |
33. A plant, on repeated self-pollination, preserves the trait expressed for many generations. Such a plant is said to be:
1. |
Panmictic |
2. |
Homologous |
3. |
Apomictic |
4. |
Pure line |
34. In a fertilised embryo sac, the haploid, diploid, and triploid structures are:
1. |
Synergid, zygote, and primary endosperm nucleus |
2. |
Synergid, antipodal and polar nuclei |
3. |
Antipodal, synergid, and primary endosperm nucleus |
4. |
Synergid, polar nuclei and zygote. |
35. Identify the incorrectly matched pair:
|
Population interaction
|
Species A
|
Species B
|
1.
|
Mutualism
|
+
|
+
|
2.
|
Predation
|
+
|
-
|
3.
|
Parasitism
|
-
|
-
|
4.
|
Commensalism
|
+
|
0
|
Biology I - Section B
36. Consider the given two statements:
Statement I: |
In Cycas, the pinnate leaves persist for a few years. |
Statement II: |
In conifers, the needle-like leaves reduce the surface area helping to reduce water loss. |
1.
Statement I is correct but
Statement II is incorrect
2.
Statement I is incorrect but
Statement II is correct
3.
Statement I and
Statement II are correct
4.
Statement I and
Statement II are incorrect
37. What is the direct source of energy for the production of ATP by ATP synthase?
1. |
the electron transport chain |
2. |
the proton gradient |
3. |
substrate-level phosphorylation |
4. |
the oxidation reactions occurring during respiration |
38. In Hatch and Slack pathway:
I: |
The C4 acid OAA is formed in the mesophyll cells. |
II: |
Malic acid or aspartic acid are transported to the bundle sheath cells. |
III: |
C4 acids are broken down to release carbon dioxide and a 3 carbon molecule in mesophyll cells. |
IV: |
The 3 carbon molecule is transported back to the bundle sheath cell where it is converted to PEP again. |
1. Only
I and
II are correct
2.
II,
III and
IV are incorrect
3. Only
I,
II and
III are correct
4.
I,
II,
III and
IV are correct
39. Given below are two statements : one is labelled as Assertion
(A) and the other is labelled as Reason
(R).
Assertion (A): |
Saprophytes play a vital role in the ecosystem. |
Reason (R): |
Saprophytes are accorded the highest trophic level in a food chain or a food web. |
In the light of the above statements, choose the most appropriate answer from the options given below :
1. |
Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. |
Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. |
(A) is True but (R) is False. |
4. |
Both (A) and (R) are False. |
40. The term used to refer to the use of bio-resources by multinational companies and other organisations without proper authorisation from the countries and people concerned without compensatory payment is:
1. Bioprospecting
2. Biopiracy
3. Biomagnification
4. Bioaccumulation
41. Identify the incorrect statement regarding the use of RNAi for creating transgenic tobacco plants resistant to Meloidogyne incognita:
1. |
Agrobacterium tumefaciens was used to transform the plant cells |
2. |
Double-stranded RNA was introduced into the plant cells |
3. |
Double-stranded RNA was formed in the plant cells that initiated RNAi |
4. |
A specific mRNA of the nematode was silenced with the help of dsRNA |
42. Match each item in Column I [Protist] with one in Column II [Characteristic] and select the correct option:
Protist |
Characteristic |
A. Chrysophytes |
P. Plasmodium |
B. Dinoflagellates |
Q. Chief producers in the ocean |
C. Euglenoids |
R. Stiff cellulose plates in cell wall on outer surface |
D. Slime moulds |
S. Two flagella, one long and one short |
Codes:
|
A |
B |
C |
D |
1. |
R |
Q |
S |
P |
2. |
Q |
S |
P |
R |
3. |
Q |
R |
S |
P |
4. |
R |
S |
Q |
P |
43. Auxins:
I: |
promote flowering in pineapples |
II: |
induce parthenocarpy in tomatoes |
III: |
like 2,4-D kill monocot weeds |
IV: |
control xylem differentiation |
1. Only I and II are correct
2. Only III is incorrect
3. I, II, III and IV are correct
4. Only I and IV are incorrect
44. Given below are two statements : one is labelled as Assertion
(A) and the other is labelled as Reason
(R).
Assertion (A): |
A piece of DNA if needed to be propagated during recombinant DNA procedures requires a vector. |
Reason (R): |
The vectors provide the origin of replication. |
In the light of the above statements, choose the most appropriate answer from the options given below :
1. |
Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. |
Both (A) and (R) are False. |
3. |
Both (A) and (R) are True but (R) is not the correct explanation of (A). |
4. |
(A) is True but (R) is False. |
45. Phellogen cuts cells on both sides where:
1. |
outer cells differentiate into cork or phelloderm and inner cells differentiate into secondary cortex or phellem |
2. |
inner cells differentiate into cork or phelloderm and outer cells differentiate into secondary cortex or phellem |
3. |
outer cells differentiate into cork or phellem and inner cells differentiate into secondary cortex or phelloderm |
4. |
inner cells differentiate into cork or phellem and outer cells differentiate into secondary cortex or phelloderm |
46. How many of the given statements regarding various modifications in leaves are correct?
I. |
Leaves are modified into tendrils for climbing as in pea. |
II. |
Leaves are modified into spines for defence as in cacti. |
III. |
The leaves of onion and garlic store food. |
IV. |
In Australian acacia, petioles expand, become green and synthesize food. |
V. |
The trapping structure of venus fly trap and pitcher of pitcher plant are modified leaves. |
47. Identify the incorrect statement regarding the floral characters of family Liliaceae:
1. |
Flower is bisexual; zygomorphic |
2. |
Perianth tepal six (3+3), often united into a tube; valvate aestivation |
3. |
Androecium: stamen six, 3+3, epitepalous |
4. |
Gynoecium: tri carpellary, syncarpous, ovary superior, trilocular with many ovules |
48. From the statements given below, choose the option that is true for a typical female gametophyte of a flowering plant:
i. |
It is 8-nucleate and 7-celled at maturity |
ii. |
It is free-nuclear during the development |
iii. |
It is situated inside the integument but outside the nucellus |
iv. |
It has an egg apparatus situated at the chalazal end |
1. | i and iv | 2. | ii and iii |
3. | i and ii | 4. | ii and iv
|
49. Consider the two statements:
Statement I: |
The respiratory pathway is better regarded as an amphibolic pathway rather than only a catabolic pathway. |
Statement II: |
The respiratory pathway is involved in both anabolism and catabolism. |
1. |
Both Statement I and Statement II are correct and Statement II explains Statement I |
2. |
Both Statement I and Statement II are correct but Statement II does not explain Statement I |
3. |
Statement I is correct but Statement II is incorrect |
4. |
Statement I is incorrect but Statement II is correct |
50. Consider the two statements:
I: |
It is desirable to use restriction enzymes produce 'sticky ends' for cloning experiments in genetic engineering. |
II: |
If the donor DNA and the vector DNA are cut by such same restriction endonuclease, ligation of the two is easy. |
1. |
Both I and II are correct and II explains I |
2. |
Both I and II are correct but II does not explain I |
3. |
Only I is correct |
4. |
Both I and II are incorrect |
Biology II - Section A
51. In the ‘test–tube baby’ procedure:
1. |
Fertilization is in-vitro but embryo development is in-vivo |
2. |
Fertilization is in-vivo but embryo development is in-vitro |
3. |
Both fertilization and embryo development are in-vitro |
4. |
Both fertilization and embryo development are in-vivo |
52. In Ctenophora:
a: |
body bears eight external rows of ciliated comb plates, which help in locomotion. |
b: |
reproduction takes place only by asexual means. |
c: |
digestion is both extracellular and intracellular. |
d: |
sexes are separate. |
The correct statements are:
1. |
a and c only |
2. |
b and d only |
3. |
a, b and c only |
4. |
a, b and d only |
53. The cell junctions in animal tissues that perform the function of cementing to keep neighbouring cells together are known as:
1. Tight junctions
2. Adhering junctions
3. Gap junctions
4. Desmosomes
54. Given below are two statements:
Assertion (A): |
Most cancers are treated by a combination of surgery, radiotherapy, and chemotherapy |
Reason (R): |
Combination therapy is curative for all types of cancers |
1. |
Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. |
Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. |
(A) is True but (R) is False. |
4. |
Both (A) and (R) are False. |
55. In a resting axonal membrane:
1. |
The outer surface possesses a positive charge while its inner surface becomes negatively charged. |
2. |
The outer surface possesses a negative charge while its inner surface becomes positively charged. |
3. |
Both the outer and the inner surface are positively charged. |
4. |
Both the outer and the inner surface are negatively charged. |
56. FSH:
1. |
Acts on Sertoli cells and stimulates secretion of some factors that help in spermiogenesis |
2. |
Acts on Sertoli cells and inhibits secretion of some factors that help in spermiogenesis |
3. |
Acts on Leydig cells and stimulates secretion of some factors that help in spermiogenesis |
4. |
Acts on Leydig cells and inhibits secretion of some factors that help in spermiogenesis |
57. Histones are rich in amino acids:
1. |
Arginine and Lysine |
2. |
Arginine and Leucine |
3. |
Arginine and Isoleucine |
4. |
Aspartate and Glutamate |
58. A glenoid cavity is:
1. |
seen in scapula and articulates with head of humerus |
2. |
seen in coxal bone and articulates with head of femur |
3. |
seen in clavicle and articulates with sternum |
4. |
seen in femur and articulates with patella |
59. In animal cells, steroidal hormones are synthesized in the:
1. |
Rough endoplasmic reticulum |
2. |
Smooth endoplasmic reticulum |
3. |
Golgi apparatus |
4. |
Lysosomes |
60. Which of the following diseases is/are correctly matched with their modes of transmission?
|
Disease/Infection
|
Mode of transmission
|
I.
|
Ascariasis
|
Contaminated food and water
|
II.
|
Elephantiasis
|
Vector-borne
|
III.
|
Ringworm
|
Direct contact
|
Options:
1. |
Only I and II |
2. |
Only I and III |
3. |
Only II and III |
4. |
I, II and III |
61. Organisms prefer sexual mode of reproduction in adverse conditions because:
1. |
It leads to a rapid proliferation of numbers |
2. |
It requires two individuals that can support the progeny |
3. |
It is less energy consuming than the asexual mode of reproduction |
4. |
It provides protection and increases variations that may help progeny to survive |
62. The first amino acid in the primary structure of a protein is termed as:
1. |
C – terminus amino acid |
2. |
N – terminus amino acid |
3. |
An imino acid |
4. |
Alpha amino acid |
63. Identify the correct statements from the following:
I: |
ANF is secreted by the right atrium of heart and causes vasodilation |
II: |
Erythropoietin is secreted by kidney and stimulates bone marrow to produce RBC |
III: |
Insulin-like growth factors are secreted by liver and play an important role in childhood growth, and has anabolic effects in adults |
1. |
Only I and II |
2. |
Only I and III |
3. |
Only II and III |
4. |
I, II and III |
64. In general, with every 10oC rise in the temperature [in the range 0oC to 40oC], the rate of enzyme catalyzed reaction:
1. Becomes half
2. Gets doubled
3. Remains same
4. There is no such correlation in general
65. Consider three sample areas with the following composition:
Sample area I: |
has three species of birds, two are represented by one individual each and the third by four individuals |
Sample area II: |
has three species of birds, each represented by two individuals |
Sample area III: |
has a species of insects, a species of mammals and a species of birds, each with two individuals |
Which area will be considered as the most diverse?
1. Sample area I
2. Sample area II
3. Sample area III
4. Sample area II and Sample area III are equally diverse
66. In humans, the sex of the baby is determined:
1. |
At the time of fertilization and by the father |
2. |
At the time of fertilization and by the mother |
3. |
At the time of implantation and by the father |
4. |
At the time of implantation and by the mother |
67. The first drug produced using recombinant DNA technology is used to treat:
1. |
haemophilia |
2. |
dwarfism |
3. |
immunodeficiency |
4. |
diabetes |
68. The type of natural selection that operates to eliminate intermediate phenotypes in a population is known as:
1. | Directional selection | 2. | Disruptive selection |
3. | Stabilizing selection | 4. | Reverse selection
|
69. Match each item in Column I with one in Column II and select the correct match from the codes given:
|
Column I
[Organism] |
|
Column II
[Osmoregulatory and excretory structure] |
A |
Flatworms, rotifers, Amphioxus |
P |
Protonephridia |
B |
Earthworm |
Q |
Nephridia |
C |
Insects |
R |
Malpighian tubule |
D |
Prawn |
S |
Green gland or antennal gland |
Codes:
|
A |
B |
C |
D |
1. |
P |
Q |
R |
S |
2. |
Q |
R |
S |
P |
3. |
R |
S |
P |
Q |
4. |
S |
P |
Q |
R |
70. The principal solute, dissolved in the plasma portion of the blood as well as the extracellular fluid (ECF), amongst the following, will be:
1. haemoglobin
2. Na+
3. K+
4. albumin
71. Which of the following equations regarding the calculation of pulmonary capacities would be correct?
1. IC = IRV – TV |
2. EC = VC – IRV |
3. VC = ERV + IRV |
4. TLC = VC – RV |
72. Both heart rate and stroke volume in a human get doubled during exercise. His cardiac output will:
1. |
double |
2. |
become four times |
3. |
become eight times |
4. |
remain the same |
73. The number of autosomes in a human egg would be:
74. Match each item in Column I [zones of adrenal cortex] with one in Column II [hormone produced] and select your answer from the codes given:
|
Column I
|
|
Column II
|
A.
|
Zona glomerulosa
|
a.
|
Aldosterone
|
B.
|
Zona fasciculata
|
b.
|
Cortisol
|
C.
|
Zona reticularis
|
c.
|
Adrenal androgens
|
Codes
|
A |
B |
C |
1. |
a |
b |
c |
2. |
a |
c |
b |
3. |
b |
a |
c |
4. |
b |
c |
a |
75. Which of the following is not a characteristic of Amphibians?
1. |
Most have two pairs of limbs and tail is present in some. |
2. |
Alimentary canal, urinary and reproductive tracts open into a common chamber called cloaca which opens to the exterior. |
3. |
Respiration is by gills, lungs and through skin. |
4. |
The heart is two chambered with one atrium and one ventricle. |
76. RNA interference:
I: |
involves silencing of a specific mRNA due to a complementary dsRNA molecule that binds to and prevents translation of the mRNA (silencing). |
II: |
has been used to create transgenic tobacco plants resistant to nematode Meloidogyne incognita |
1. |
Only I is correct |
2. |
Only II is correct |
3. |
Both I and II are correct |
4. |
Both I and II are incorrect |
77. Similar biological structures or sequences in different taxa are homologous if they:
1. |
always perform the same function |
2. |
result from convergent evolution |
3. |
do not serve any known function |
4. |
are derived from a common ancestor |
78. DNA is structurally and chemically more stable than RNA because of the following except:
1. |
It has thymine instead of uracil |
2. |
2’ –OH is absent in DNA |
3. |
It replicates itself based on complementary base pairing |
4. |
It does not have any catalytic role |
79. The combination pill is taken by a female:
1. |
Daily, for a period of 21 days beginning within the first 5 days of the menstrual cycle |
2. |
On alternate days, for a period of 21 days beginning within the first 5 days of the menstrual cycle |
3. |
Daily, for a period of 21 days beginning after the end of the menstrual flow |
4. |
Daily, for a period of 7 days beginning after the end of the menstrual flow |
80. Match the plasma proteins in Column I with their function in Column II and select the correct answer from the codes given:
|
Column I |
|
Column II |
A. |
Albumins |
a. |
Hemostasis |
B. |
Globulins |
b. |
Transport carriers and immunity |
C. |
Fibrinogen |
c. |
Colloid osmotic pressure |
Codes
|
A |
B |
C |
1. |
a |
b |
c |
2. |
a |
c |
b |
3. |
b |
a |
c |
4. |
c |
b |
a |
81. As the distance from Z line to Z line decreases, which bands shorten in a sarcomere?
1. |
the I band and H band |
2. |
the I band and A band |
3. |
the A band and H band |
4. |
all bands shorten |
82. Eicchornia crassipes,
Parthenium hysterophorus, and
Lantana camara are:
1. |
native species of India |
2. |
critically endangered plants of India |
3. |
invasive plant species |
4. |
medicinal plants |
83. A foetus receiving some antibodies from mother through placenta is an example of:
1. |
Naturally acquired active immunity |
2. |
Artificially acquired active immunity |
3. |
Artificially acquired passive immunity |
4. |
Naturally acquired passive immunity |
84. The underlying basis of the Polymerase Chain Reaction is:
1. |
DNA synthesis and hence amplification can occur in a template independent manner. |
2. |
DNA, being thermostable, can be amplified during the thermal cycle in PCR. |
3. |
DNA polymerase I can synthesize large amounts of DNA. |
4. |
PCR allows the direct amplification of DNA even if it is present in minute quantities. |
85. The mode of inheritance of the Mendelian disorder shown in the given pedigree chart is most likely:
1. |
Autosomal recessive |
2. |
Autosomal dominant |
3. |
Sex-linked recessive |
4. |
Sex-linked dominant |
Biology II - Section B
86. Match each item in Column I with one in Column II and select the correct match from the codes given:
|
Column I |
|
Column II |
A |
Myasthenia gravis |
P |
Auto-immune |
B |
Arthritis |
Q |
Inflammation of joints |
C |
Tetany |
R |
Low calcium in body fluids |
D |
Osteoporosis |
S |
Low levels of oestrogen |
Codes:
|
A |
B |
C |
D |
1. |
P |
Q |
R |
S |
2. |
Q |
R |
S |
P |
3. |
R |
S |
P |
Q |
4. |
S |
P |
Q |
R |
87. Identify the incorrect statement regarding
Bacillus thuringiensis?
1. |
forms protein crystals during a particular phase of their growth which contains a toxic insecticidal protein. |
2. |
The Bt toxin protein exists as an inactive protoxin that is converted into an active form by an alkaline pH in the insect's gut. |
3. |
Activated toxin binds to the surface of midgut epithelial cells, creates pores, causes cell swelling and lysis and eventually death of the insect. |
4. |
Proteins encoded by the genes cryIAc and cryIIAb control the corn borer, that of cryIAb controls cotton bollworms. |
88. The nervous system of a frog is organised into:
I: |
central nervous system |
brain and spinal cord |
II: |
peripheral nervous system |
cranial and spinal nerves |
III: |
autonomic nervous system |
sympathetic and parasympathetic |
1. |
Only I and II |
2. |
Only I and III |
3. |
Only II and III |
4. |
I, II and III |
89. Which part of the human hindbrain consists of fibre tracts that interconnect different regions of the brain?
1. pons
2. cerebellum
3. medulla oblongata
4. corpora quadrigemina
90. Identify the incorrect statement regarding antidiuretic hormone (ADH):
1. |
It is synthesized by the neurons of the hypothalamus and stored and released from the neurohypophysis. |
2. |
It binds to receptors on the collecting duct cells and activates a cAMP second messenger system. |
3. |
It is released during body dehydration conditions and acts on the collecting duct. |
4. |
ADH is released when osmoreceptors in the hypothalamus sense a decrease in the blood osmolality. |
91. Occasionally, a single gene may express more than one effect. The phenomenon is called:
1. |
multiple allelism |
2. |
mosaicism |
3. |
pleiotropy |
4. |
polygeny |
92. Consider the given two statements:
I: |
SA node is the natural pacemaker of the human heart. |
II: |
SA node is the only part of that nodal musculature that is auto-excitable. |
1. |
Only I is correct |
2. |
Only II is correct |
3. |
Both I and II are correct |
4. |
Both I and II are incorrect |
93. The number of correct statements regarding hemichordates from the given is:
I. |
A stomochord is present in the collar region |
II. |
Circulation is of open type |
III. |
Excretory organ is proboscis gland |
IV. |
Development is indirect |
94. Which of the following is incorrect regarding emphysema?
1. |
Alveolar walls are damaged |
2. |
There is an increase in the respiratory surface |
3. |
Major cause is cigarette smoking |
4. |
Can be caused by deficiency of Alpha-1-antitrypsin enzyme |
95. Given below are two statements : one is labelled as Assertion
(A) and the other is labelled as Reason
(R).
Assertion (A): |
An adapter molecule, that on one hand can read the genetic code and on the other hand can bind to specific amino acids, is required for the translation of proteins. |
Reason (R): |
Amino acids have no structural specialties to read the code uniquely. |
In the light of the above statements, choose the most appropriate answer from the options given below :
1. |
Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. |
Both (A) and (R) are False. |
3. |
Both (A) and (R) are True but (R) is not the correct explanation of (A). |
4. |
(A) is True but (R) is False. |
96. Given the following statements about activities in the early earth:
I: |
Water vapour, methane, carbon dioxide, and ammonia released from molten mass covered the surface. |
II: |
The UV rays from the sun broke up water into Hydrogen and Oxygen and the lighter H2 escaped. |
III: |
Oxygen combined with ammonia and methane to form water, CO2, and other gases. |
IV: |
As it cooled, the water vapour fell as rain, filling all the depressions and forming oceans. |
Select the correct statements:
1. Only
I,
II and
III are correct
2. Only
I,
II and
IV are correct
3. Only
II,
III and
IV are correct
4. All are correct
97. If any protein-encoding gene is expressed in a heterologous host, the protein formed is called:
1. |
Recombinant protein |
2. |
Native protein |
3. |
Pro-protein |
4. |
Exotic protein |
98. The number of correct statements amongst the given is:
Statement I: |
Parasitism has evolved in many taxonomic groups from plants to higher vertebrates. |
Statement II: |
Many parasites have evolved to be host-specific and both tend to co-evolve. |
Statement III: |
All parasites have only one primary and one intermediate host. |
Statement IV: |
Only a few of the parasites harm their hosts. |
99. In the schematic representation of gametogenesis in humans, what will be the correct description for A- E?
|
A |
B |
C |
D |
E |
1. |
First meiotic division |
Second Meiotic division |
23 |
First polar body |
Second polar body |
2. |
Mitosis and differentiation |
First meiotic division |
23 |
First polar body |
Secondary polar body |
3. |
First meiotic division |
Second Meiotic division |
46 |
First polar body |
Second polar body |
4. |
Mitosis and differentiation |
First meiotic division |
46 |
First polar body |
Secondary polar body |
100. What is not correct regarding the pathogenesis of AIDS in humans?
I: |
HIV first enters into the macrophages. |
II: |
Macrophages are used by HIV as a factory to produce more virus particles. |
III: |
The viral cDNA does not get integrated into any cells in the human body. |
IV: |
HIV also enters the T-helper cells and destroys them. |
V: |
The anti-retroviral treatment for AIDS is completely curative. |
1. |
All except V |
2. |
Only III and V |
3. |
Only I, III and IV |
4. |
All |
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