Primary tissues of a plant

Options

A. Add to the length of roots and shoots
B. Add to the diameter of existing roots and shoots
C. Are found only in the embryo
D. Are found only in the seedling

Answer

**Step-by-Step Solution:**

1. **Understanding Primary Tissues**: Primary tissues in plants are the initial tissues that develop from the apical meristems. They are responsible for the growth in length (primary growth) of roots and shoots.

2. **Types of Primary Tissues**: The primary tissues of a plant can be categorized into three main types:
- **Parenchyma**: These are the most common type of plant cells, characterized by thin walls and large vacuoles. They are involved in storage, photosynthesis, and tissue repair.
- **Collenchyma**: These cells have thicker cell walls and provide support to the plant while allowing for flexibility. They are typically found in young stems and leaf petioles.
- **Sclerenchyma**: These cells have very thick walls and are usually dead at maturity. They provide structural support and strength to the plant.

3. **Function of Primary Tissues**:
- **Parenchyma**: Functions in storage, photosynthesis, and healing.
- **Collenchyma**: Provides support while allowing for growth.
- **Sclerenchyma**: Offers rigidity and strength to withstand various stresses.

4. **Growth Contribution**: Primary tissues contribute to the overall growth of the plant by adding to the length of roots and shoots through the activity of the apical meristems, which are regions of actively dividing cells.

5. **Summary**: In summary, the primary tissues of a plant include parenchyma, collenchyma, and sclerenchyma, each playing a vital role in the plant's growth and development.

---