English Medium कक्षा ९ - CBSE Question Bank Solutions

The best evidence for the existence and movement of particles in liquids was provided by :

The best evidence for the existence and movement of particles in liquids was provided by :

Bromine and air take about 15 minutes to diffuse completely but bromine diffuses into a vacuum very rapidly. Why is this so?

Bromine and air take about 15 minutes to diffuse completely but bromine diffuses into a vacuum very rapidly. Why is this so?

Explain why, osmosis can be considered to be a special kind of diffusion. Classify the following into

(i) osmosis, and (ii) diffusion  :

1. swelling up of a raisin on keeping in water
2. spreading of virus on sneezing
3. earthworm dying on coming in contact with common salt
4. shrinking of grapes kept in thick sugar syrup
5. preserving of pickles in salt
6. spreading of smell of cake being baked in the kitchen
7. aquatic animals using oxygen dissolved in water during respiration

Explain why, osmosis can be considered to be a special kind of diffusion. Classify the following into

(i) osmosis, and (ii) diffusion  :

1. swelling up of a raisin on keeping in water
2. spreading of virus on sneezing
3. earthworm dying on coming in contact with common salt
4. shrinking of grapes kept in thick sugar syrup
5. preserving of pickles in salt
6. spreading of smell of cake being baked in the kitchen
7. aquatic animals using oxygen dissolved in water during respiration

An inflated balloon full of air goes down slowly (becomes smaller and smaller slowly) even though the knot at the mouth of the balloon is airtight. And after a week all the air has escaped from the balloon. Explain how the air particles got out of the balloon.

An inflated balloon full of air goes down slowly (becomes smaller and smaller slowly) even though the knot at the mouth of the balloon is airtight. And after a week all the air has escaped from the balloon. Explain how the air particles got out of the balloon.

When extremely small particles X derived from the anther of a flower were suspended in a liquid Y and observed through a microscope, it was found that the particles X were moving throughout the liquid Y in a very zig-zag way. It was also observed that warmer the liquid Y, faster the particles X moved on its surface.

1. What could particles X be ?
2. What do you think liquid Y is ?
3. What is the zig-zag movement of X known as ?
4. What is causing the zig-zag movement of particles X ?
5. Name the scientist who discovered this phenomenon.
6. What does this experiment tell us about the nature of liquid Y?

When extremely small particles X derived from the anther of a flower were suspended in a liquid Y and observed through a microscope, it was found that the particles X were moving throughout the liquid Y in a very zig-zag way. It was also observed that warmer the liquid Y, faster the particles X moved on its surface.

1. What could particles X be ?
2. What do you think liquid Y is ?
3. What is the zig-zag movement of X known as ?
4. What is causing the zig-zag movement of particles X ?
5. Name the scientist who discovered this phenomenon.
6. What does this experiment tell us about the nature of liquid Y?

What is the importance of tissues?

Why do plants and animals possess different types of tissues?

Tabulate differences between plants and animal tissues.

Write down names of different types of plant tissues.

During respiration, glucose and oxygen enter our body cells and waste products carbon dioxide and water leave the body cells by the process of :

During respiration, glucose and oxygen enter our body cells and waste products carbon dioxide and water leave the body cells by the process of :

In Which Tissue is Found Anyone of the Following Structures : Neuron, Dendrite, Cilia, Collagen Fibres, Elastin Fibre.

What are the different tissues in animals.

Which of the following is a mixture ?

Salt, Air, Water, Alum, Sugar

Which of the following is a mixture ?

Salt, Air, Water, Alum, Sugar