Is Matter Around Us Pure? — Science STD 9 — Question

1. What are the two ways of obtaining fish?
2. What is the major problem faced in fish farming? How can it be overcome.

The values of g at six distances A, B, C, D, E and F from the surface of the earth are found to be 3.08m/s², 9.2.3m/s², 0.57m/s², 7.34m/s², 0.30m/s² and 1.49m/s², respectively.

1. Arrange these values of g according to the increasing distances from the surface of the earth (keeping the value of g nearest to the surface of the earth first).
2. If the value of distance F be 10000km from the surface of the earth, state whether this distance is deep inside the earth or high up in the sky. Give reason for your answer.

Discuss how do personal and community issues affect health?

Give an example of diffusion across plasma membrane.

Name three physical agents which cause weathering of rocks.

Cytoplasmic bridges between adjacent plant cells are called?