Select true statements -
(A) Phloem fibres are generally absent in the primary phloem.
(B) Root hairs help in absorption of water and minerals from the soil
(c ) Trichome help in preventing water loss due to transpiration.

Options

A. Only A and B
B. Only B and C
C. Only A and C
D. All A, B and C

Answer

To determine which statements are true, let's analyze each one step by step:

### Step 1: Analyze Statement A
**Statement A**: "Phloem fibres are generally absent in the primary phloem."

- **Explanation**: Primary phloem is formed during the early stages of plant growth. At this stage, the plant is still developing, and the need for support structures like phloem fibers is minimal. Phloem fibers are typically lignified and are dead cells that provide support rather than conducting nutrients. Therefore, they are generally absent in the primary phloem.
- **Conclusion**: This statement is **true**.

### Step 2: Analyze Statement B
**Statement B**: "Root hairs help in absorption of water and minerals from the soil."

- **Explanation**: Root hairs are extensions of root epidermal cells that increase the surface area of the root. This increased surface area allows for more efficient absorption of water and minerals from the soil. As the plant grows, the demand for water and nutrients increases, making root hairs essential for maximizing absorption.
- **Conclusion**: This statement is **true**.

### Step 3: Analyze Statement C
**Statement C**: "Trichomes help in preventing water loss due to transpiration."

- **Explanation**: Trichomes are hair-like structures on the epidermis of plants. They can serve various functions, including reducing water loss by creating a barrier that traps moisture and reducing air movement near the leaf surface. Some trichomes are glandular and can secrete substances that further help in reducing water loss. Thus, they play a significant role in minimizing transpiration.
- **Conclusion**: This statement is **true**.

### Final Conclusion
All three statements (A, B, and C) are true.