NCERT Solutions for Class 7 Science Chapter 12
Important NCERT Questions
7th Chapter 12 Reproduction in Plants
NCERT Books for Session 2022-2023
CBSE Board and State Board
Questions No: 8
Describe the various ways by which seeds are dispersed.
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Following are the various methods of seed dispersal:
• Dispersal by Wind: Seeds of some plants are light-weight and some hair-like or wing-like structures are present on them. Such seeds float on air and are thus dispersed by wind. Example: Dandelion, maple, drumstick, etc.
• Dispersal by Water: Dispersal by water takes place in some aquatic plants and in some which grow near a water body. Seeds of water lily float and thus dispersed by water. The coconut seed has a tough fibrous covering which has plenty of air inside. This helps the coconut seeds in floating on water.
• Dispersal by Animals: Some seeds have spine like structures on them. They get stuck to the fur of animals and thus get spread to different places. Examples; Beggar tick, Xanthium, etc. Some seeds are swallowed by birds and animals along with fruits. These seeds get dispersed with bird or animal droppings.
• Dispersal by Bursting: Some fruits burst open when they mature. The force of bursting is enough to spread the seeds. Examples; Ladyfinger, castor, balsam, etc.
• Dispersal by Humans: Human beings also help in dispersal of seeds, especially during farming.
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Seeds disperse in several ways: Wind dispersal happens when lightweight seeds equipped with structures like wings or parachutes are carried by the wind, enabling them to travel far. Water dispersal occurs as buoyant seeds float on water, aiding their spread. Some seeds attach to animals or are ingested and dispersed through animal droppings. Others burst open to scatter seeds forcefully, while heavy seeds fall close to the parent plant. These methods help seeds reach new places for growth and survival.