Question

The different steps in a nodule formation are given below –

I. A matured nodule establishes a direct vascular connection with the host for exchange of nutrients

II. Root hair curls and the bacteria invade the root hair

III. Rhizobium bacteria contact a susceptile root hair, divide near it

IV. The infection thread is produced carring the bacteria and grows into the cortex of the root

V. The bacteria get modified into rod-shaped bacteroids and cause inner cortical layer and pericycle to divide to form nodule.

The correct sequence is –

• A. III, II, IV, I, V
• B. III, II, IV, V, I
• C. IV, V, III, II, I
• D. I, III, V, II, IV

Answer 1

Answer: (B)

III, II, IV, V, I