Physiology Of Animals And Plants PYQs — 30 UPSC CSE Previous Year Questions

Question 1

Which of the following organisms perform waggle dance for others of their kin to indicate the direction and the distance to a source of their food?

Accepted Answer

C. Honeybees

Question 2

Which of the following are nitrogen-fixing plants? Alfalfa Amaranth Chickpea Clover Purslane (Kulfa) Spinach Select the correct answer using the code given below:

Accepted Answer

A. 1, 3 and 4 only

Question 3

Consider the following statements : Some species of turtles are herbivores. Some species of fish are herbivores. Some species of marine mammals are herbivores. Some species of snakes are viviparous. Which of the statements given above are correct?

Accepted Answer

D. 1, 2, 3 and 4

Question 4

Consider the following: Bats Bears Rodents The phenomenon of hibernation can be observed in which of the above kinds of animals?

Accepted Answer

C. 1, 2 and 3

Question 5

Some species of plants are insectivorous. Why?

Accepted Answer

B. They are adapted to grow in nitrogen deficient soils and thus depend on insects for sufficient nitrogenous nutrition.

Question 6

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

Accepted Answer

C. 7.35–7.45

Question 7

Assertion (A) : In human body, liver has important role in fat digestion. Reason (R) : Liver produces two important fat-digesting enzymes.

Accepted Answer

C. A is true but R is –false

Question 8

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

Accepted Answer

D. Ileum - Jejunum–Duodenum

Question 9

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

Accepted Answer

B. Urea

Question 10

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

Accepted Answer

A. The large intestine

Question 11

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

Accepted Answer

B. Gastrin

Question 12

In human body, which one of the following hormones regulates blood calcium and phosphate?

Accepted Answer

C. Parathyroid hormone

Question 13

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

Accepted Answer

C. Medulla oblongata

Question 14

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

Accepted Answer

B. Blue and red

Question 15

Consider the following statements with reference to the human body:

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

Which of the statements given above is / are correct?

Accepted Answer

B. 2 only

Question 16

Assertion (A) : The person with Diabetes insipidus feels thirsty. Reason (R) : A person with Diabetes insipidus suffers from excess secretion of vasopressin.

Accepted Answer

C. A is true but R is false

Question 17

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

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

Which of these statements is/are correct?

Accepted Answer

C. Both 1 and 2

Question 18

Which one of the following statements is not correct?

Accepted Answer

A. All echinoderms are viviparous.

Question 19

Assertion (A) : Drinking of whisky increases the frequency of urination. Reason (R) : Alcohol intake speeds up the secretion of vasopressin in the body.

Accepted Answer

C. A is true but R is false

Question 20

With reference to the human body, consider the following statements:

The production of somatotropin goes up when a person exercises.
Men's testes produce progesterone.
Women's adrenal glands secrete testosterone.
Stress causes the adrenals to release very less amount of cortisol than usual.

Which of these statements are correct?

Accepted Answer

D. 1 & 4

Question 21

Match List-I with List-H and select the correct answer using the codes given below the lists

	List-I (Substance)		List-II (Physiological role)
A.	Ptyalin	1.	Converts angiotensinogen in blood into angiotensin
B.	Pepsin	2.	Digests starch
C.	Renin.	3.	Digests proteins
D.	Oxytocin	4.	Hydrolyses fats
		5.	Induces contraction of smooth muscles -

Accepted Answer

A. 2315

Question 22

The sensation of fatigue in the muscles after prolonged strenuous physical work is caused by

Accepted Answer

D. the accumulation of lactic acid

Question 23

Match List I (Endocrine glands) with List II (Hormones secreted) and select the correct answer using the codes given below the Lists: List I List II I. Gonads A) Insulin II. Pituitary B) Progesterone III. Pancreas C) Growth hormones IV. Adrenal D) Cortisone

Accepted Answer

C. I­B, II­C, III­A, IV­D

Question 24

The blood glucose level is commonly expressed as

Accepted Answer

B. milligram per decilitre

Question 25

Match the hormones in List-I with items in List-II and select the correct answer using the codes given below:

	List- I		List-II
A.	Adrenaline	1.	Anger, fear, danger
B.	Estrogen	2.	Attracting partners through sense of smell
C.	Insulin	3.	Females
D.	Pheromones	4	Glucose

Codes:
ABCD

Accepted Answer

C. 1342

Question 26

In eye donation, which one of the following parts of donor's eye is utilized?

Accepted Answer

C. Cornea

Question 27

For which one of the following is capillarity not the reason?

Accepted Answer

B. Rising of underground water

Question 28

The pituitary gland by virtue of its tropic hormones controls the secretaoy activity of other endocrine glands. Which one of the following endocrine gland can function independent of the pituitary gland?

Accepted Answer

D. Parathyroid

Question 29

Fat present below the skin surface in our body, acts as a barrier against

Accepted Answer

A. Loss of heat from the body

Question 30

Which one of the following is not an essential micronutrient for plants?

Accepted Answer

C. Sodium

List I	List II
I. Gonads	A) Insulin
II. Pituitary	B) Progesterone
III. Pancreas	C) Growth hormones
IV. Adrenal	D) Cortisone