Assertion (A): Darwin preferred pea plants for his experiments on genetics as it is a unisexual plant.

Reason (R): Pea plants are normally self-pollinated.

1. (A) is true and (R) is false.
2. (A) is false and (R) is true.
3. Both (A) and (R) are true.
4. Both (A) and (R) are false.

Anup participated in a marathon race and felt dehydrated by the end of the race. The human body has mechanisms to conserve water and prevent dehydration. Which part of the nephron is primarily responsible for the reabsorption of water to prevent dehydration?

1. Glomerulus
2. Proximal Convoluted Tubule
3. Loop of Henle
4. Distal Convoluted Tubule

(a) 3

(b) 2 and 3

(c) 1, 2 and 3

(d) 2, 3 and 4

Assertion (A): Blood flows from the left atrium to the left ventricle of the heart.

Reason (R): The tricuspid valve separates the left atrium from the left ventricle.

1. (A) is true and (R) is false.
2. (A) is false and (R) is true.
3. Both (A) and (R) are true.
4. Both (A) and (R) are false.

Which adaptation is NOT associated with desert plants to minimise water loss through transpiration?

1. Reduced number of stomata
2. Thick, waxy cuticle
3. Deep root systems
4. Increased leaf surface area