The molecules, in general, tend to move from a place of their higher concentration to lower concentration. This process is known as diffusion. The diffusion of water across a semipermeable membrane is called osmosis. It can be observed between the cytoplasm of cells and extracellular fluid.

SCIENCE TEXTBOOK FOR CLASS IX>Chapter 5 - The Fundamental Unit of Life>Exercises>Q 6

MEDIUM

9th CBSE

IMPORTANT

Earn 100

Where do the lipids and proteins constituting the cell membrane get synthesised?

Important Questions on The Fundamental Unit of Life

MEDIUM

9th CBSE

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS IX>Chapter 5 - The Fundamental Unit of Life>Exercises>Q 7

How does an Amoeba obtain its food?

EASY

9th CBSE

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS IX>Chapter 5 - The Fundamental Unit of Life>Exercises>Q 8

What is osmosis?

HARD

9th CBSE

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS IX>Chapter 5 - The Fundamental Unit of Life>Exercises>Q 9

Carry out the following osmosis experiment:
Take four peeled potato halves and scoop each one out to make potato cups. One of these potato cups should be made from a boiled potato. Put each potato cup in a trough containing water. Now,
(a) Keep cup A empty
(b) Put one teaspoon sugar in cup B
(c) Put one teaspoon salt in cup C
(d) Put one teaspoon sugar in the boiled potato cup D.
Keep these for two hours. Then observe the four potato cups and answer the following:
(i) Explain why water gathers in the hollowed portion of B and C.
(ii) Why is potato A necessary for this experiment?
(iii) Explain why water does not gather in the hollowed-out portions of A and D.

EASY

9th CBSE

IMPORTANT

SCIENCE TEXTBOOK FOR CLASS IX>Chapter 5 - The Fundamental Unit of Life>Exercises>Q 10

Which type of cell division is required for growth and repair of body and which type is involved in formation of gametes?