Question

During nodule formation in leguminous plants, an infection thread is produced carrying the (i) into the (ii) of the root, where they initiate the nodule formation in the (iii) of the root.
Fill up the blanks by choosing the correct option.

• A. (i) - Cyanobacteria, (ii) - Pericycle, (iii) - Cortex
• B. (i) - Bacteria, (ii) - Cortex, (iii) - Cortex
• C. (i) - Cyanobacteria, (ii) - Cortex , (iii) - Pericycle
• D. (i) - Bacteria, (ii) - Pericycle, (iii) - Pericycle

Answer 1

The correct option is B (i) - Bacteria, (ii) - Cortex, (iii) - Cortex

After the bacteria (Rhizobium) evade the root hair needle. They travel up till cortex region of root where they change their shape and turn into bacteriods and start fixing atmospheric nitrogen in cortex cell of plant roots.

Thus, the correct answer is '(i) - bacteria, (ii) - cortex, (iii) - cortex.'