Describe the structure of the seed which helps it to float.​


Describe the structure of the seed which helps it to float.​

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Emma 3 months 2021-07-17T13:14:03+00:00 2 Answers 0 views 0

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    Ncert solutions

    Grade 7



    Chapters in NCERT Solutions – Science , Class 7

    Exercises in Reproduction in Plants

    Question 8

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


    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.



    The seed consists of three components: embryo, endosperm (sometimes perisperm), and seed-coat. Both endosperm and embryo are the products of double fertilization, whereas the seed-coat develops from the maternal, ovular tissues. The seed habit is a significant advancement in the evolution of higher plants.


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