The correct option is
All three pairs
Explanation
Seed dispersal is the transport of seeds away from the parent plant to ensure better survival and reduced competition. Plants have evolved specific morphological adaptations to utilize agents such as wind (anemochory) and animals (zoochory) for effective dispersal.
Pair 1: Correct
Maple seeds are equipped with wing-like membranous outgrowths. These structures are aerodynamic adaptations that allow the seeds to be caught by the wind and carried away from the parent tree. This type of seed is often referred to as a samara.
Pair 2: Correct
Aak (Madar/Calotropis) seeds possess a tuft of fine, light hairs (coma). These hairs act like a parachute, enabling the seeds to float in the air and be dispersed by wind currents over long distances.
Pair 3: Correct
Urena seeds (and fruits like Xanthium) are covered with spines or hooks. These structures are adaptations for zoochory (dispersal by animals). The hooks allow the seeds to attach to the fur of passing animals or the clothing of humans, facilitating transport to new locations.
Key Takeaway:
Wind-dispersed seeds typically feature wings (e.g., Maple, Drumstick) or hair (e.g., Madar, Cotton), whereas animal-dispersed seeds often possess hooks or spines (e.g., Xanthium, Urena) for attachment.