Biology - PYQ

Question 1

Front

Answer 1

Back

Question 2

Expand the following biological abbreviations: (i) ABA

Answer 2

Abscisic Acid

Question 3

Expand the following biological abbreviations: (ii) IAA

Answer 3

Indole-3-acetic Acid

Question 4

Expand the following biological abbreviations: (iii) ATP

Answer 4

Adenosine Triphosphate

Question 5

Expand the following biological abbreviations: (iv) DNA

Answer 5

Deoxyribonucleic Acid

Question 6

Expand the following biological abbreviations: (v) TSH

Answer 6

Thyroid Stimulating Hormone

Question 7

Cretinism

Answer 7

(b) Hyposecretion of Thyroxine

Question 8

Diabetes Insipidus

Answer 8

(d) Hyposecretion of Vasopressin

Question 9

Exophthalmic Goitre

Answer 9

(g) Hypersecretion of Thyroxine

Question 10

Adrenal Virilism

Answer 10

(a) Hypersecretion of Adrenal Cortex

Question 11

Dwarfism

Answer 11

(c) Hyposecretion of Growth Hormone

Question 12

Sacculus

Answer 12

Static body balance

Question 13

Birth rate

Answer 13

Natality

Question 14

DNA and histones

Answer 14

Nucleosome

Question 15

Euro norms

Answer 15

Vehicular standards

Question 16

Diabetes mellitus

Answer 16

Hyperglycemia

Question 17

The part of the brain that carries impulses from one hemisphere of the cerebellum to the other.

Answer 17

Pons

Question 18

A plant cell may burst when:

Answer 18

“(B) Turgor pressure exceeds wall pressure”

Question 19

The individual flattened stacks of membranous structures inside the chloroplasts are known as:

Answer 19

“(C) Thylakoids”

Question 20

The nephrons discharge their urine at the:

Answer 20

“(C) Renal pelvis”

Question 21

Gigantism and Acromegaly are due to:

Answer 21

“(D) Hypersecretion of Growth hormone”

Question 22

The mineral ion needed for the formation of blood clot is:

Answer 22

“(C) Calcium”

Question 23

Complete stoppage of menstrual cycle in females.

Answer 23

Menopause

Question 24

Pigment providing colour to urine.

Answer 24

Urochrome

Question 25

The fluid present in the middle chamber of cochlea.

Answer 25

Endolymph

Question 26

The structure that maintains dynamic equilibrium.

Answer 26

"Semicircular canals (or specifically, the cristae ampullaris within the semicircular canals)"

Question 27

Colour blindness is more common in men than in women.

Answer 27

Colour blindness is a sex-linked recessive trait carried on the X chromosome. Males only have one X chromosome, so if they inherit the affected allele, they will be colour blind. Females have two X chromosomes and need to inherit the affected allele on *both* chromosomes to be colour blind, making it less common.

Question 28

Injury to medulla oblongata leads to death.

Answer 28

The medulla oblongata controls essential involuntary functions like breathing, heart rate, and blood pressure. Damage to this area can disrupt these vital functions, leading to death.

Question 29

When an ovum gets fertilized, the menstrual cycle stops temporarily in a woman.

Answer 29

After fertilization, the corpus luteum (which develops from the ruptured follicle) starts secreting progesterone. Progesterone maintains the thickened endometrium (lining of the uterus) necessary for pregnancy. This prevents the shedding of the uterine lining, which is what menstruation is.

Question 30

Mature erythrocytes in humans lack a nucleus and mitochondria.

Answer 30

Mature red blood cells (erythrocytes) lose their nucleus to create more space for hemoglobin, maximizing their oxygen-carrying capacity. They lack mitochondria to avoid consuming the oxygen they carry and to rely on glycolysis for energy production.

Question 31

Blood flows in arteries in spurts and is under pressure.

Answer 31

The left ventricle of the heart pumps blood into the arteries with force during systole (contraction). This creates pressure and pulsatile flow (spurts) in the arteries. The elasticity of the artery walls helps maintain the pressure between heartbeats.