STUDY POINT

Explain the terms: (i) Speciation (ii) Natural selection
Answer. (i) Speciation is the evolution of reproductive isolation among once-interbreeding populations, i.e. the development of one or more species from an existing species.
(ii) Natural selection is the process, according to Darwin, which brings about the evolution of new species of animals and plants.

The remains of dead plants and animals which were buried under the rocks millions of years ago are called fossils.
Fossils tell us about the process of evolution. The fossils of different organisms have some features similar to one species while some features are similar to the other species. In this way, they show the link between two species. They tell us that one species evolves from the other.

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"• ✓A mechanical tissue and provides mechanical support and elasticity to the stems of dicot plants.
• ✓Cells possess chloroplast, then it is involved in manufacturing sugar and starch.
• ✓Provides tensile strength and flexibility to the plant body."

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