Plant growth is
(a) Limited
(b) Unlimited
(c) Diffused
(b) Both a and b

Options

A. Limited
B. Unlimited
C. Diffused
D. Both (1) and (2)

Answer

To solve the question "Plant growth is," we will analyze each option provided and determine the correct answer step by step.

### Step-by-Step Solution:

1. **Understanding Plant Growth**:
- Plant growth refers to the irreversible increase in size or mass of the plant or its parts (like leaves, stems, roots).
- Growth is a permanent change and cannot be reversed.

**Hint**: Consider what defines growth in biological terms.

2. **Analyzing the Options**:
- **(a) Limited**: This implies that plant growth has a maximum size or limit. While some plants may have limitations based on environmental factors, growth in plants can continue as long as conditions are favorable.
- **(b) Unlimited**: This suggests that plants can grow indefinitely. Many plants can continue to grow throughout their life due to the presence of meristems, which are regions of active cell division.
- **(c) Diffused**: This term does not accurately describe plant growth. Growth is typically localized in specific areas (like meristems) rather than being diffused.
- **(d) Both a and b**: This option suggests that plant growth can be both limited and unlimited, which can be true in different contexts.

**Hint**: Think about the characteristics of plant growth and how they relate to the options.

3. **Evaluating Meristems**:
- Meristems are regions in plants where cells can divide and differentiate, allowing for continuous growth. This is why many plants can grow indefinitely.
- However, environmental factors (like nutrient availability, water, light, etc.) can limit growth at certain times.

**Hint**: Reflect on the role of meristems in plant growth.

4. **Conclusion**:
- Given that plants can exhibit both unlimited growth (due to meristems) and can be limited by environmental conditions, the most accurate answer is **(d) Both a and b**.

**Final Answer**: (d) Both a and b