English Medium इयत्ता ९ - CBSE Question Bank Solutions for Science

Why is excess use of fertilizers detrimental to the environment?

Growing wheat and groundnut on the same field is called ______.

Planting soybean and maize in alternate rows in the same field is called ______.

Growing different crops on a piece of land in pre-planned succession is known as ______.

Define the terms hybridization and photoperiod.

Photoperiod affect the ______.

Define Vermicompost

Define Green manure

Across

1. Oil yielding plant (9)

3. Crop is grown in the winter season (4)

5. Fixed by Rhizobium (8)

9. Common honey bee (4)

Downward

2. Animal feed (6)

4. A micronutrient (5)

6. Unwanted plant in crop fields (4)

7. An exotic breed of chicken(7)

8. Bottom feeders in the fish pond(7)

10. A marine fish (4)

Which of the following are matter?

Chair, air, love, smell, hate, almonds, thought, cold, lemon water, smell of perfume.

Give reasons for the following observation:

The smell of hot sizzling food reaches you several metres away, but to get the smell from cold food you have to go close.

A diver is able to cut through water in a swimming pool. Which property of matter does this observation show?

What are the characteristics of particles of matter?

What are canal rays?

If an atom contains one electron and one proton, will it carry any charge or not?

Who discovered cells and how?

Make a comparison and write down ways in which plant cells are different from animal cells.

What is osmosis?

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,

1. Keep cup A empty
2. Put one teaspoon of sugar in cup B
3. Put one teaspoon salt in cup C
4. 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:

1. Explain why water gathers in the hollowed portion of B and C.
2. Why is potato A necessary for this experiment?
3. Explain why water does not gather in the hollowed-out portions of A and D.

Write the answer of the question with reference to laws of gravitation.

State the universal law of gravitation.