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

The diagram given below represents a nephron. Ultrafiltration of blood occurs in:

1. Bowman’s capsule
2. Glomerulus
3. Proximal Convoluted Tubule
4. Loop of Henle

Which of the following statements are correct?

P — Night blindness is caused by the deficiency of Vitamin A.

Q — Utriculus gives dynamic balance to the body.

R — Neuron is a single cell.

S — Fossil fuels are inexhaustible sources of energy.

1. Q and S
2. R and S
3. P and Q
4. P and R