The seeds of which of the following plants are not dispersed by wind ?

Question

Accepted Answer

The correct answer is Option 3: Coconut. Here's a detailed explanation justifying why this option is correct and why the other options are incorrect:

1. **Coconut (Option 3)**:
   - Coconuts are primarily dispersed by water, not by wind. The coconut fruit is buoyant and can float on water, allowing it to travel long distances across oceans and seas. This method of dispersal is known as hydrochory. The fibrous husk of the coconut enables it to remain afloat and protects the seed inside until it reaches a suitable location for germination. This adaptation is particularly beneficial for coconut trees, which often grow in coastal areas.

2. **Calotropis (Option 1)**:
   - Calotropis seeds are dispersed by wind. The seeds are equipped with tufts of silky hairs, known as pappus, which act like parachutes. These hairs catch the wind, allowing the seeds to be carried over long distances. This method of dispersal is known as anemochory, which is typical for plants that produce lightweight seeds with structures that facilitate wind transport.

3. **Cotton (Option 2)**:
   - Similar to Calotropis, cotton seeds are also dispersed by wind. The seeds are surrounded by fluffy fibers that help them to be carried by the wind. These fibers increase the surface area of the seeds, making them light enough to be transported by air currents. This adaptation helps cotton plants to spread their seeds over a wide area.

4. **Drumstick (Moringa) (Option 4)**:
   - Drumstick seeds are dispersed by wind as well. The seeds are encased in long, slender pods that can split open, releasing the seeds. The seeds themselves have wing-like structures that enable them to be carried by the wind. This adaptation allows the seeds to travel away from the parent plant, reducing competition and increasing the chances of successful germination in a new location.

In conclusion, the correct answer is Option 3: Coconut, because coconuts are dispersed by water, not by wind, unlike the other options listed.