• INDIAN POLITY FOR CIVIL SERVICES EXAMINATIONS
  • Indian Culture for Prelims Preparation
  • Environment and Ecology
  • Economics
  • Geography
  • Science & Technology
  • Indian History
  • Current Affairs

Biology

  1. Structure and Organization of Cell
  2. Human Physiology
  3. Plant Physiology
  4. Human Diseases
  5. Vitamins , Minerals, and Proteins
  6. Biotechnology
  • NCERT- Science-  Class VIII- Chapter 8
  • NCERT _Biology- Class XI- Unit III- Chapters 8 and 10 ,Unit IV and V
  • NCERT _Biology- Class XII- Unit VII, VIII, IX

[2011 Prelims]

1)At present, scientists can determine the arrangement or relative positions of genes or DNA sequences on a chromosome. How does this knowledge benefit us? 

1. It is possible to know the pedigree of livestock. 
2. It is possible to understand the causes of all human diseases. 
3. It is possible to develop disease-resistant animal breeds, 

Which of the statements given above is/are correct? 

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

2)Aspartame is an artificial sweetener sold in the market. It consists of amino acids and provides calories like other amino acids. Yet, it is used as a low-calorie sweetening agent in food items. What is the basis of this use ?

(a) Aspartame is as sweet as table sugar, but unlike table sugar, it is not readily oxidized in the human body due to lack of requisite enzymes.

(b) When aspartame is used in food processing, the sweet taste remains, but it becomes resistant to oxidation.

(c) Aspartame is as sweet as sugar, but after ingestion into the body, it is converted into metabolites that yield no calories.

(d) Aspartame is several times sweeter than table sugar, hence, food items made with small quantities of aspartame yield fewer calories on oxidation.

3)A married couple adopted a male child. A few years later, twin boys were born to them. The blood group of the couple is AB positive and O negative. The blood group of the three sons is A positive, B positive , and O positive. The blood group of the adopted son is ?

(a)O positive .

(b)A positive.

(c)B positive .

(d)Cannot be determined on the basis of the given data.

4)When the bark of a tree is removed in a circular fashion all around near its base, it gradually dries up and dies because ?

(a)    Water from soil cannot rise to aerial parts.

(b)    Roots are starved of energy.

(c)    The tree is infected by soil microbes.

(d)    Roots do not receive oxygen for respiration.

5)Regular intake of fresh  fruits and vegetables is recommended in the diet since they are a good source of antioxidants. How do antioxidants  help a person maintain health and  promote longevity ?

(a)    They activate the enzymes necessary for vitamin synthesis in the body and help prevent vitamin deficiency.

(b)    They prevent excessive  oxidation of carbohydrates, fats and proteins in the body and help avoid unnecessary wastage of energy.

(c)    They neutralize the free radicals produced in the body during metabolism.

(d)    They activate certain genes in the cells of the body and help delay the ageing process.

6)A company marketing food products advertise that its items do not contain trans-fats. What does this campaign signify to the customers ?

  1. The food products are not made out of hydrogenated oils.
  2. The food products are not made out of animal fats/oils.
  3. The oils used are not likely to damage the cardiovascular health of the consumers.

Which of the statements given above is/are correct ?

(a)    1 only.

(b)    2 and 3 only.

(c)    1 and 3 only.

(d)    1,2 and 3.

[2012 Prelims]

1)Other than resistance to pests, what are the prospects for which genetically engineered plants have been created?

  1. To enable them to withstand drought
  2. To increase the nutritive value of the produce
  3. To enable them to grow and do photosynthesis in spaceships and space stations
  4. To increase their shelf life

Select the correct answer using the codes given below:

[A]1 & 2 Only

[B]3 & 4 Only

[C]1, 2 & 4 Only

[D]1, 2, 3 & 4

2)What are the reasons for the people’s resistance to the introduction of Bt brinjal in India?

  1. Bt brinjal has been created by inserting a gene from a soil fungus into its genome.
  2. The seeds of Bt brinjal are terminator seeds and therefore, the farmers have to buy the seeds before every season from the seed companies.
  3. There is an apprehension that the consumption of Bt brinjal may have an adverse impact on health.
  4. There is some concern that the introduction of Bt brinjal may have an adverse effect on the biodiversity.

Select the correct answer using the codes given below :

[A]1, 2 & 3 Only

[B]2 & 3 only

[C]3 & 4 only

[D]1,2,3 & 4

3)With reference to ‘stem cells’ frequently in the news, which of the following statements is / are correct?

  1. Stem cells can be derived from mammals only.
  2. Stem cells can be used for screening new drugs.
  3. Stem cells can be used for medical therapies.

Select the correct answer using the codes given below:

[A]1 & 2 Only

[B]2 & 3 Only

[C]3 Only

[D]1,2 and 3

4)Consider the following kinds of organisms:

  1. Bacteria 2. Fungi 3. Flowering plants

Some species of which of the above kinds of organisms are employed as biopesticides?

[A]1 Only

[B]2 & 3 Only

[C]1 & 3 Only

[D]1,2 & 3

[2013 Prelims]

1)Fruits stored in cold chamber exhibit long storage life because ___:

  1. Exposure to sunlight is prevented
  2. Concentration of Carbon dioxide in the environment is increased
  3. Rate of respiration is decreased
  4. There is an increase in humidity

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

[A]Bacteria

[B]Protozoa

[C]Moulds

[D]Viruses

3)Consider the following organisms :

  1. Agaricus
  2. Nostoc
  3. Spirogyra

Which of the above is/are used as biofertilizer/ biofertilizers?

[A]1 and 2

[B]2 only

[C]2 and 3

[D]3 only

4)Consider the following minerals:

  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

5)With reference to the usefulness of the by-products of the sugar industry, which of the following statements is/are correct ?

  1. Bagasse can be used as biomass fuel for the generation of energy.
  2. Molasses can be used as one of the feedstocks 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

6)Many transplanted seedlings do not grow because?

[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

7)Which of the following statements is/are correct ?

  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

8)Which of the following leaf modifications occurs/occur in desert areas to inhibit water loss ?

  1. Hard and waxy leaves
  2. Tiny leaves or no leaves
  3. Thorns instead of leaves

Select the correct answer using the codes given below.

[A]1 and 2 only

[B]2 only

[C]1 and 3 only

[D]1, 2 and 3

9)Mycorrhizal biotechnology has been used in rehabilitating degraded sites because mycorrhiza enables the plants to?

  1. Resist drought and increase absorptive area
  2. Tolerate extremes of ph
  3. Resist disease infestation

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

[2014 Prelims]

1)Which of the following statements is / are correct regarding vegetative propagation of plants?

  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

2) Which of the following statements is / are correct regarding vegetative propagation of plants?

  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

3)Consider the following pairs:     

Vitamin                   Deficiency disease

  1. Vitamin C        Scurvy
  2. Vitamin D       Rickets
  3. Vitamin E        Night blindness

Which of the pairs given above is/are correctly matched?

(a) 1 and 2 only

(b) 3 only

(c) 1, 2 and 3

(d) None

4)In India, cluster bean (Guar) is traditionally used as a vegetable or animal feed, but recently the cultivation of this has assumed significance. Which one of the following statements is correct in this context?

(a) The oil extracted from seeds is used in the manufacture of biodegradable plastics

(b) The gum made from its seeds is used in the extraction of shale gas

(c) The leaf extract of this plant has the properties of anti-histamines

(d) It is a source of high quality biodiesel

5)With reference to Neem tree, consider the following statements:

  1. Neem oil can be used as a pesticide to control the proliferation of some species of insects and mites.
  2. Neem seeds are used in the manufacture of biofuels and hospital detergents.
  3. Neem oil has applications in pharmaceutical industry.

Which of the statements given above is/are correct?

(a) 1 and 2 only

(b) 3 only

(c) 1 and 3 only

(d) 1, 2 and 3

6)Which one of the following is the process involved in photosynthesis?

(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

7)Consider the following techniques/phenomena:

  1. Budding and grafting in fruit plants
  2. Cytoplasmic male sterility
  3. Gene silencing

Which of the above is/are used to create transgenic crops?

(a) 1 only

(b) 2 and 3

(c) 1 and 3

(d) None

8)Consider the following statements:

  1. Maize can be used for the production of starch.
  2. Oil extracted from maize can be a feedstock for biodiesel.
  3. Alcoholic beverages can be produced by using maize.

Which of the statements given above is/are correct?

(a) 1 only

(b) 1 and 2 only

(c) 2 and 3 only

(d) 1, 2 and 3

9)Among the following organisms, which one does not belong to the class of other three?

(a) Crab

(b) Mite

(c) Scorpion

(d) Spider

10)Consider the following diseases

  1. Diphtheria
  2. Chickenpox
  3. Smallpox

Which of the above diseases has/have been eradicated in India?

(a) 1 and 2 only

(b) 3 only

(c) 1, 2 and 3

(d) None

[2015 Prelims]

1)Among the following, which were frequently mentioned in the news for the outbreak of Ebola virus recently?

(a) Syria and Jordan

(b) Guinea, Sierra Leone and Liberia

(c) Philippines and Papua New Guinea

(d) Jamaica, Haiti and Surinam

2)H1N1 virus is sometimes mentioned in the news with reference to which one of the following diseases?

(a) AIDS

(b) Bird Flu

(c) Dengue

(d) Swine Flu

[2017 Prelims]

1) With reference to agriculture in India, how can the technique of `genome sequencing’, often seen in the news, be used in the immediate future?

  1. Genome sequencing can be used to identify genetic markers for disease resistance and drought tolerance in various crop plants.
  2. This technique helps in reducing the time required to develop new varieties of crop plants.
  3. It can be used to decipher the host-pathogen relationships in crops.

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

Answer: D

2) What is the application of Somatic Cell Nuclear Transfer Technology?

(a) Production of biolarvicides

(b) Manufacture of biodegradable plastics

(c) Reproductive cloning of animals

(d) Production of organisms free of diseases

Answer : C