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Nodule formation in leguminous plants oc...

Nodule formation in leguminous plants occur due to
(i) Cytokinins produced by invading bacteria
(i) Auxins produced by plant cell.
(iii) Auxins produced by invading bacteria.
(iv) Cytokinin produced by plant cell.
(a) (i) and (ii) only
(b) (i) and (iii) only
(c) (iii) and (iv) only
(d) (ii) and (iv) only

A

(i) and (ii) only

B

(i) and (iii) only

C

(iii) and (iv) only

D

(ii) and (iv) only

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding nodule formation in leguminous plants, we need to analyze the statements provided and understand the roles of different hormones involved in this process. ### Step-by-Step Solution: 1. **Understanding Nodule Formation**: - Nodule formation occurs in leguminous plants as a result of a symbiotic relationship with nitrogen-fixing bacteria, primarily Rhizobium. - This process involves the interaction between the plant and the bacteria, leading to the development of root nodules. 2. **Identifying the Hormones Involved**: - The two main phytohormones involved in nodule formation are **cytokinins** and **auxins**. - **Cytokinins** are hormones that promote cell division and are produced by the invading bacteria (Rhizobium). - **Auxins** are hormones that regulate plant growth and are produced by the plant cells themselves. 3. **Analyzing the Statements**: - (i) Cytokinins produced by invading bacteria: **True** (produced by Rhizobium). - (ii) Auxins produced by plant cell: **True** (produced by the plant). - (iii) Auxins produced by invading bacteria: **False** (auxins are not produced by Rhizobium). - (iv) Cytokinins produced by plant cell: **False** (cytokinins are produced by the bacteria, not the plant). 4. **Selecting the Correct Option**: - Since statements (i) and (ii) are true, the correct answer is option (a) (i) and (ii) only. ### Final Answer: **(a) (i) and (ii) only** ---
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