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CBSE Class 7 Answered

Describe the verious ways by which seeds are dispersed .
Asked by purnimabiswas384 | 27 Jun, 2021, 09:04: AM
Expert Answer

Method of Seed Dispersal:

 Dispersal by Wind

Seeds dispersed by wind are usually light and small.

When mature and dry, the fruit opens and releases seeds which are dispersed by wind. Examples: Moringa (drum stick).

Dispersal by Animals

Certain birds eat fruits along with their seeds. On the ground, these seeds germinate to give rise to a new plant. Examples: Tomato, guava and chilli Some fruits cling to the bodies of passing animals or to the clothing of humans and get transported over great distances. Examples: Urena and Xanthium.

Dispersal by Water

Plants which grow along the coastal regions produce fruits which can float in water, and thereby, get transported by waves. Example: Coconut.

Dispersal by Gravitational Force

Fruits of certain plants fall on the ground due to gravitational force and the seeds are flown with the fruit. Example: Mango, Berries.

Dispersal by Internal Force

Pods of some plants burst due to evaporation of water; the seeds are blown away and dispersal takes place. Example- Black gram, Peas

 
Answered by Sheetal Kolte | 28 Jun, 2021, 12:20: PM

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