Question

Oral Questions
Name the parts of a seed. S
How does water disperse the seeds?
cience Quiz:
Name a plant that grows from leaves.
Name a plant whose seeds are disperse
k() the correct options:​

Answer 1

Answer:

Ncert solutions

Grade 7

Mathematics

Science

Chapters in NCERT Solutions - Science , Class 7

Exercises in Reproduction in Plants

Question 8

Q8) Describe the various ways by which seeds are dispersed.

Solution:

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.
• Not all plants are suitable, but many popular ones are, including African Violets and large-leaved rhizomatous Begonias. One mature plant can provide as many new plants as you are likely to want, but taking leaf cuttings is so enjoyable that you may want to grow some extra for friends.