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Assertion and reason type questions:
1. Origin of earth:
| Assertion: | A galaxy is a complex structure made up of millions or billions of stars, as well as gas and dust. |
| Reason: | Galaxies are formed by the organization of hydrogen and other nuclei. |
2. Acquired characters of
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| Assertion: | Wings of an insect and wings of the bat are examples of analogous organs. |
| Reason: | Analogous organs have different origin and structural organisation but the same function. |
3. Homologous and analogous organs
| Assertion: | Speciation is a process in which new species are formed from pre-existing ones. |
| Reason: | Mutation is a process that plays a role in speciation. |
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