9F) Biology (Prelims PYQs)

1] Which one of the following statements best describes the role of B cells and T cells in the human body?  [2022]

a) They protect the body from environmental allergens.
b) They alleviate the body’s pain and inflammation
c) They act as immunosuppressants in the body.
d) They protect the body from diseases caused by pathogens.

2] Consider the following statements in respect of probiotics: [2022]
1. Probiotics are made of both bacteria and yeast.
2. The organisms in probiotics are found in foods we ingest but they do not naturally occur in our gut.
3. Probiotics help in the digestion of milk sugars.
Which of the statements given above is/are correct?

a) 1 only
b) 2 only
c) 1 and 3
d) 2 and 3

3] Consider the following: [2021]
1) Bacteria
2) Fungi
3) Virus
Which of the above can be cultured in artificial/synthetic medium?

a) 1 and 2 only
b) 2 and 3 only
c) 1 and 3 only
d) 1, 2 and 3

4] In the nature, which of the following is/are most likely to be found surviving on a surface without soil? [2021]
1) Fern
2) Lichen
3) Moss
4) Mushroom
Select the correct answer using the code given below.

a) 1 and 4 only
b) 2 only
c) 2 and 3
d) 1, 3 and 4

5] Consider the following statements: [2021]
1) Adenoviruses have single-stranded DNA genomes whereas retroviruses have double-stranded DNA genomes.
2) Common cold is sometime caused by an adenovirus whereas AIDS is caused by a retrovirus.
Which of the statements given above is/are correct?

a) 1 only
b) 2 only
c) Both 1 and 2
d) Neither 1 nor 2

6] Which of the following statements are correct regarding the general difference between plant and animal cells? [2020]
1. Plant cells have cellulose cell walls whilst animal cells do not.
2. Plant cells do not have plasma membranes unlike animal cells which do.
3. Mature plant cell has one large vacuole whilst an animal cell has many small vacuoles.
Select the correct answer using the code given below:

a) 1 and 2 only
b) 2 and 3 only
c) 1 and 3 only
d) 1, 2 and 3

7] Which of the following are the reasons for the occurrence of multi-drug resistance in microbial pathogens in India? [2019]
1. Genetic predisposition of some people
2. Taking incorrect doses of antibiotics to cure diseases
3. Using antibiotics in livestock farming
4. Multiple chronic diseases in some people
Select the correct answer using the code given below.

a) 1 and 2
b) 2 and 3 only
c) 1, 3 and 4
d) 2, 3 and 4

8] Consider the following: [2018]
1. Birds
2. Dust blowing
3. Rain
4. Wind blowing
Which of the above spread plant diseases:

a) 1 and 3 only
b) 3 and 4 only
c) 1, 2 and 4 only
d) 1, 2, 3 and 4

9] Which of the following statements is/are correct? [2016]
Viruses can infect:
1. Bacteria
2. Fungi
3. Plants
Select the correct answer using the code given below.

a) 1 and 2 only
b) 3 only
c) 1 and 3 only
d) 1, 2 and 3

10] Which one of the following is the process involved in photosynthesis? [2014]

a) Potential energy is released to form free energy.
b) Free energy is converted into potential energy and stored.
c) Food is oxidized to release carbon dioxide and water.
d) Oxygen is taken, and carbon dioxide and water vapour are given out.

11] Among the following organisms, which one does not belong to the class of other three? [2014]

a) Crab
b) Mite
c) Scorpion
d) Spider

12] Which of the following statements is/are correct regarding vegetative propagation of plants? [2014]
1. Vegetative propagation produces clonal population.
2. Vegetative propagation helps in eliminating the virus.
3. Vegetative propagation can be practiced most of the year.
Select the correct answer using the code given below.

a) 1 only
b) 2 and 3 only
c) 1 and 3 only
d) 1, 2 and 3

13] With reference to the usefulness of the by-products of sugar industry, which of the following statements is/are correct? [2013]
1. Bagasse can be used as biomass fuel for the generation of energy.
2. Molasses can be used as one of the feedstock for the production of synthetic chemical fertilizers.
3. Molasses can be used for the production of ethanol.
Select the correct answer using the codes given below.

a) 1 only
b) 2 and 3 only
c) 1 and 3 only
d) 1, 2 and 3

14] Improper handling and storage of cereal grains and oilseeds result in the production of toxins known as aflatoxin which are not generally destroyed by normal cooking process. Aflatoxin are produced by? [2013]

a) Bacteria
b) Protozoa
c) Moulds
d) Viruses

15] Consider the following minerals: [2013]
1. Calcium
2. Iron
3. Sodium
Which of the minerals given above is/are required by human body for the contraction of muscles?

a) 1 only
b) 2 and 3 only
c) 1 and 3 only
d) 1, 2 and 3

16] Consider the following animals: [2013]
1. Sea cow
2. Sea horse
3. Sea lion
Which of the above is/are mammal/ mammals?

a) 1 only
b) 1 and 3 only
c) 2 and 3 only
d) 1, 2 and 3

17] Many transplanted seedlings do not grow because? [2013]

a) The new soil does not contain favourable minerals
b) Most of the root hairs grip the new soil too hard
c) Most of the root hairs are lost during transplantation
d) Leaves get damaged during transplantation

18] Which of the following statements is/are correct? [2013]
1. Viruses lack enzymes necessary for the generation of energy.
2. Viruses can be cultured in any synthetic medium.
3. Viruses are transmitted from one organism to another by biological vectors only.
Select the correct answer using the codes given below.

a) 1 only
b) 2 and 3 only
c) 1 and 3 only
d) 1, 2 and 3

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