| W Surrounded by tiny hair |
| X Thick coat of fibres |
| Y Presence of hooks or spines |
| Z Enclosed in a fruit that bursts open when mature |
A)
Seed
Agent of dispersal
W - Dandelion
Water
B)
Seed
Agent of dispersal
X - Coconut
Explosion
C)
Seed
Agent of dispersal
Y - Xanthium
Air
D)
Seed
Agent of dispersal
Z - Cotton
Explosion
Correct Answer: B
Solution :
The coconut seed has a thick coat of fibre that enables it to float in water and thus dispersed by water (Water dispersal). Seeds of cotton and dandelion have tiny hair surrounding them, which help the seeds to be carried by wind (Wind dispersal). Some seeds such as Xanthium have hooks or spines which help them to stick to the fur of animals or to our clothes and get carried away (Animal dispersal). Fruits of some legumes such as pea and castor burst open forcibly after drying, so that their seeds get scattered in all directions.
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