Select the CORRECT statements from the following :
(P) In monocots , leaf base expands into sheath covering the stem partially or wholly
(Q) In all leguminous plants, the leaf base may become swollen , which is called the pulvinus
(R) The lamina or leaf blade is green expanded part of the leaf with vein and veinlets
(S) veins provide rigidity to leaf blade.
(a) P and Q only
(b) R and S only
(c) All except Q
(d) All

Options

A. P and Q only
B. R and S only
C. All except Q
D. All

Answer

To solve the question, we need to evaluate each of the provided statements (P, Q, R, S) and determine their correctness.

### Step-by-Step Solution:

1. **Evaluate Statement P**:
- Statement: "In monocots, leaf base expands into sheath covering the stem partially or wholly."
- Analysis: This statement is correct. In monocot plants, the leaf base does indeed expand to form a sheath that can cover the stem either partially or completely.

2. **Evaluate Statement Q**:
- Statement: "In all leguminous plants, the leaf base may become swollen, which is called the pulvinus."
- Analysis: This statement is also correct. In many leguminous plants, the leaf base can swell to form a structure known as the pulvinus, which is involved in leaf movement.

3. **Evaluate Statement R**:
- Statement: "The lamina or leaf blade is the green expanded part of the leaf with vein and veinlets."
- Analysis: This statement is correct. The lamina (or leaf blade) is indeed the flattened, green part of the leaf that contains veins and veinlets, which are essential for the transport of nutrients and water.

4. **Evaluate Statement S**:
- Statement: "Veins provide rigidity to the leaf blade."
- Analysis: This statement is correct. The veins in the leaf provide structural support and rigidity to the leaf blade, allowing it to maintain its shape.

### Conclusion:
All statements (P, Q, R, S) are correct. Therefore, the correct answer is (d) All.