Balsam
Explanation
Seed dispersal is the biological process by which seeds are transported away from the parent plant to ensure germination in favorable environments and minimize competition. Plants utilize various agents for this purpose, including wind (anemochory), water (hydrochory), animals (zoochory), and self-dispersal through mechanical force (autochory).
Option Analysis:
- Balsam (Correct): Balsam (Impatiens) employs an explosive mechanism for seed dispersal. As the fruit pod matures and dries, tension builds up in its walls. When the pod is fully ripe or touched, it bursts open with a sudden jerk, mechanically propelling the seeds to a considerable distance.
- Maple (Incorrect): Maple seeds possess wing-like extensions (samaras) that allow them to spin and be carried by the wind. They do not disperse via bursting.
- Grass (Incorrect): Grass seeds are typically light and small, adapted for dispersal by wind or by adhering to animal fur. They do not exhibit an explosive mechanism.
- Aak (Madar) (Incorrect): The seeds of Aak (Calotropis) are equipped with a tuft of silky hair (coma). This adaptation acts as a parachute, facilitating dispersal by wind.
Key Takeaway:
Balsam, Castor, and Pea plants disperse their seeds through an explosive mechanism (bursting with a jerk), whereas plants like Maple and Aak rely on wind adaptations.