Gravitation — Science STD 9 — Question

Which chemical is deposited at the corner of cells in collenchymas?

Is plasma membrane living or dead?

Mention different aspects of fish culture.

What name is given to the repetition of sound caused by the reflection of sound waves?

When sugar is dissolved in water, there is no increase in the volume. Which characteristic of matter is illustrated by this observation?

What can you say about the motion of a body if its speed-time graph is a straight line parallel to the time axis?

What percent of moisture should be present in the food grains at the time of storage?

In the following questions, a statement of Assertion is given by the corresponding statement of Reason. Of the statements, mark the correct answer as:

1. If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
2. If both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
3. If Assertion is true, but Reason is false.
4. If Assertion is false, but Reason is true.
5. If Assertion and Reason both are false.

Assertion: A change in the pressure of water bodies is water pollution. Reason: It is one of the most serious environmental problems in the world.

Name the animal and its respective phylum having parapodia for locomotion.

In the following questions, a statement of Assertion is given by the corresponding statement of Reason. Of the statements, mark the correct answer as:
Assertion: In crop rotation, two or more crops are grown together on same land.
Reason: It ensures maximum utilisation of nutrients supplied.