91Ó°ÊÓ

Seeds are the protective covering that encloses the developing embryo. It is formed by the ovule after fertilization takes place.

• Flower is the reproductive organ of angiosperms which consist of the female and male reproductive parts.
• Leaves are the green flattened outgrowth from the stem of vascular plants that are specialized for photosynthesis. The chloroplast is found in the leaves.
• Roots are the parts of vascular plants that is located below the ground that helps absorb water and nutrients from the ground.

• Seeds are the protective covering within which the embryo is contained and protected.
• Evolution of seeds in plants allowed plants to reproduce in absence of water.
• Several tissues in seeds prevent desiccation and reduce the dependency on constant supply of water.
• This helped plants to expand into dry lands and survive dry conditions.
• Seeds are dispersed easily by wind or animals.

Thus seeds helped widen the geographic range of a plant species and are an agent of dispersal.