Pappus occurs in compositae for

Options

A. Air pollution
B. Air dispersal
C. Insect pollination
D. Animal dispersal

Answer

### Step-by-Step Solution:

1. **Understanding Pappus**: The pappus is a specialized structure found in the family Compositae (Asteraceae). It is essentially a modified calyx that plays a crucial role in seed dispersal.

2. **Function of Pappus**: The primary function of the pappus is to facilitate air dispersal of seeds. The structure of the pappus resembles a tuft of hair or a parachute, which helps the seeds to be carried away by the wind.

3. **Mechanism of Dispersal**: When the seeds are released, the pappus opens up like an umbrella. This shape allows the seeds to catch the wind effectively, enabling them to travel over long distances.

4. **Analyzing the Options**:
- **Option A: Air Pollution** - This is unrelated to the function of pappus.
- **Option B: Air Dispersal** - This is the correct answer, as pappus is specifically adapted for wind dispersal.
- **Option C: Insect Pollination** - While insects do play a role in pollination, they are not involved in the dispersal mechanism of pappus.
- **Option D: Animal Dispersal** - This is also incorrect, as pappus does not facilitate seed dispersal by animals.

5. **Conclusion**: Based on the analysis, the correct answer is **Option B: Air Dispersal**, as the pappus is specifically adapted for this purpose in the Compositae family.