Science & Technology › Biology – UPSC Prelims PYQs

Which one of the following is synthesised in human body that dilates blood vessels and increases blood flow ?

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

Which of the following have species that can establish symbiotic relationship with other organisms?

1. Cnidarians
2. Fungi
3. Protozoa

Select the correct answer using the code given below.

Which of the following statements are correct regarding the general difference between plant and animal cells ?

1. Plant cells have cellulose cell walls whilst animal cells do not.
2. Plant cells do not have plasma membrane unlike animal cells which do.
3. Mature plant cell has one large vacuole whilst animal cell has many small vacuoles.

Select the correct answer using the code given below :

The word 'Denisovan' is sometimes mentioned in media in reference to

Which of the following phenomena might have influenced the evolution of organisms?

1. Continental drift
2. Glacial cycles

Select the correct answer using the code given below.

Consider the following :

1. Bats
2. Bears
3. Rodents The phenomenon of hibernation can be observed in which of the above kinds of animals?

Lichens, which are capable of initiating ecological succession even on a bare rock, are actually a symbiotic association of

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

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?

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

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?

Fruits stored in a cold chamber exhibit longer storage life because

Many transplanted seedlings do not grow because

Which one of the following sets of elements was primarily responsible for the origin of life on the Earth?

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

Which one of the following processes in the bodies of living organisms is a digestive process ?

From the point of view of evolution of living organisms, which one of the following is the correct sequence of evolution ?

Consider the following statements:

1. Sweet orange plant is propagated by grafting technique.
2. Jasmine plant is propagated by layering technique.

Which of the statements given above is/are correct?

Consider the following :

1. Camphor
2. Chicory
3. Vanilla

Which of the above is/are plant product(s) ?

In the context of Indian wild life, the flying fox is a

In making the saffron spice, which one of the following parts of the plant is used ?

With reference to the evolution of living organisms, which one of the following sequences is correct?

In which one of the following kinds of organisms is the phenomenon found wherein the female kills the male after copulation?

Which one of the following is an insectivorous plant?

What is the pH level of blood of a normal person?

Norman Ernest Borlaug who is regarded as the father of the Green Revolution in India is from which country?

Assertion (A): In human body, liver has an important role in fat digestion.

Reason (R): Liver produces two important fat-digesting enzymes.

Among the following, which one lays eggs and does not produce young ones directly?

Which one of the following parts of the pitcher plant becomes modified into a pitcher?

In the human body, to which structure is the appendix attached?

In the human body

which one of the following hormones regulates blood calcium and phosphate?

How do most insects respire?

Which one of the following parts of the human brain is the regulating centre for swallowing and vomiting?

Production

of which one of the following is a function of the liver?

Which of the following is not a digestive enzyme in the human system?

Which of the following light types of light are strongly absorbed by plants:

In human beings, normally

in which one of the following parts does the sperm fertilize the ovum?

Which on the following is the correct sequence in order of decreasing length of the three structural parts given below of small intestine in the human body?

What is the name of the vessel that delivers the nutrient-rich blood from the stomach and small intestine to the liver?

Consider the following statements with reference to the human body:

1. The common bile duct releases its contents into the stomach.
2. The pancreatic duct releases its contents into the duodenum.

Which of the statements given above is/are correct?

What is the order of magnitude of electric resistance of the human body (dry)?

Consider the following statements :

1. During the process of osmosis, the solvent travels from the concentrated solution to the dilute solution.
2. In the reverse osmosis, external pressure is applied to the dilute solution.

Which of the statements given above is/are correct?

Assertion (A): All the proteins in our food are digested in small intestine only.

Reason (R): The protein-digesting enzymes from pancreas are released into small intestine.

Assertion (A): Amoeba reproduces by fission.

Reason (R): All unicellular organisms reproduce by asexual methods.

The hormone insulin is a

In which organ of the human body are the lymphocyte cells formed?

With reference to the work of human kidney, consider the following statements:

1. After the waste is removed in the kidney, the cleaner blood is sent back through renal artery.
2. From Bowman’s capsule, the filtered liquid passes through tiny tubes where much of the glucose is reabsorbed and sent back to the blood in the renal vein.

Which of these statements is/are correct?

Octopus is

With reference to normal human beings, consider the following statements:

1. In response to the presence of HCl, secretin is produced from the duodenum
2. Enterogastrone is produced in the small intestine in response to the presence of fatty acids

Which of these statements is/are correct?