MCQ
1) We can protect soil from erosion and maintain its quality by following this.
i) Cutting down trees
ii) Planting more trees
iii) Using fertilizers
iv) Planting same crops again and again
ii) Planting more trees
1) Assertion: Animals are useful to us only because they give us food .
Reason: Animals help us in farm and household work and also provide materials like wool and leather.
A is false but R is true.
1) Write any two uses of soil.
Ans: 1) Soil provides nutrients , air and water to help plants grow.
2) Soil is also home for many animals like rabbits, snakes, rats etc.
1) In Riya’s area, many trees were cut to build new houses. Soon, the weather became hotter and birds disappeared. The people then planted new trees.
a) What human activity caused the problem?
Ans: Cutting down trees caused the problem.
2) Which of the following is not a gemstone.
i) Diamond
ii) Mica
iii) Emerald
iv) Ruby
ii) Mica
2) Assertion: The carrying away of topsoil is called soil erosion.
Reason: Deforestation can cause soil erosion.
Both A and R are true and R is the correct explanation of A.
2) Defines deforestation.
Clearing down of forest is called deforestation.
b) What step was taken to improve the situation?
Ans: Planting new trees was the step taken to improve the situation.
3) Van Mahotsav is celebrated for a week in month of _______ every year.
a) June b) April c) July d) December
a) June
3) Assertion:Minerals are found on the surface of the Earth.
Reason: Minerals are used to make jewellery and tools.
A is false and R is true
3) Why soil erosion increases when trees are cut down?
1) Trees roots hold the soil by their roots. 2) If trees are cut down, soil will flow away with heavy rain or wind which causes increase in soil erosion
c) Mention one benefit of planting trees.
4) _________ is celebrated on 5 June.
a) Earth day
b) Water Day
c) World environment day
d) Van Mohatsav
c) World environment day
4) Assertion : Plants are natural resources.
Reason: We get food and oxygen from plants.
A and R are true and R is correct explanation of A
4) What do you mean by humus?
Ans: Humus is the layer mixed with topsoil which is formed by dead and decayed plant and animal matter. This layer makes soil fertile.
4) What would happen if they did not plant trees again?
Ans: Weather would become more hotter, there would be no rain and it will harm all living beings