The rate of growth of any organism follows
Or
Typical growth curve in plants is

Options

A. linear
B. stair-steps shaped
C. parabolic
D. sigmoid

Answer

### Step-by-Step Solution:

1. **Understanding Growth Curves**:
- The growth of organisms, including plants, can be represented graphically. The typical growth curve shows how the size or weight of an organism changes over time.

2. **Identifying the Shape of the Growth Curve**:
- The most common shape of a growth curve in plants is the sigmoid curve, which is S-shaped. This curve indicates different phases of growth.

3. **Phases of the Sigmoid Growth Curve**:
- **Lag Phase**: This is the initial phase where growth is slow as the organism acclimatizes to its environment.
- **Exponential (Log) Phase**: In this phase, the growth rate increases rapidly, leading to significant size or weight gain in a short period.
- **Diminishing Phase**: Growth begins to slow down as resources become limited or the organism reaches a certain size.
- **Stationary Phase**: Growth levels off, and the organism reaches a steady state where growth stops.

4. **Comparison with Other Growth Curves**:
- Other types of growth curves include linear (straight line), parabolic (curved but not S-shaped), and stair-step (discrete growth stages). However, these do not accurately represent the typical growth pattern seen in plants.

5. **Conclusion**:
- The correct answer to the question regarding the typical growth curve in plants is that it follows a sigmoid curve.