Diversity In Living Organisms — Science STD 9 — Question

Name a few alternative sources of energy other than conventional fossil fuels.

From where do the plants get carbon, oxygen and hydrogen?

Who is the father of Taxonomy? Name the book written by him.

Why is it difficult to develop vaccines for some diseases?

What name is given to the persistence of sound in a big hall or auditorium?

Name the organ of locomotion in Mollusca.

Out of solids, liquids and gases, which one has: Maximum movement of particles?

When an incense stick (agarbatti) is lighted in one corner of a room, its fragrance spreads in the whole room quickly. Which characteristic of the particles of matter is illustrated by this observation?

Name the organ of locomotion in Mollusca.

In the following Questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:
Assertion: Medicine are easily absorbed by our body in colloidal form.
Reason: It is because they have large surface area and therefore, absorbed easily.