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Everyday Science

Description: Questions on science for class 4 Danger of DeforestationConstruction of Electric Cell and Electric Bulb
Number of Questions: 15
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Tags: Questions on science for class 4 Danger of Deforestation Construction of Electric Cell and Electric Bulb
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Which of the following is true?

  1. Cutting down of trees prevents soil erosion.

  2. Strong winds and heavy rain keep the soil in its place.

  3. Ploughing on hill slope makes the soil strong.

  4. Sub soil is more fertile than top soil.

  5. Overgrazing by animals causes soil erosion.


Correct Option: E
Explanation:

Yes, overgrazing by animals causes soil erosion. So this is the correct statement.

Which of the following is the wrong statement?

  1. Erosion is the transfer of soil from one place to another.

  2. Erosion is caused by natural forces like wind water and rain.

  3. People and animal do not cause soil erosion.

  4. Cutting down of trees causes soil erosion.

  5. Erosion carries away the fertile topsoil.


Correct Option: C
Explanation:

No,  people and animal also cause soil erosion. People cause it by cutting down of trees and animals cause it by over grazing the fields. So this is a wrong statement.

Which of the following cannot be a harmful effect of soil erosion?

  1. Fertility of top soil decreases.

  2. Land slowly turns barren.

  3. Soil losses its moisture, minerals and nutrients.

  4. Crop yielding capacity of the soil deteriorates.

  5. Soil erosion does not changes the shape and size of the land.


Correct Option: E
Explanation:

No, erosion can change the shape and size of the land, it can destroy land surface, leading to landslides. So this a wrong statement.

Which of the following is not a human activity which results in soil erosion?

  1. Cutting down of trees.

  2. Following wrong methods of farming.

  3. Landslides due to erosion.

  4. Let the animals overgraze the fields.

  5. Mining actvities.


Correct Option: C
Explanation:

Landslides due to soil erosion is not a human activity. It occurs due to natural forces. So this is the right answer.

Match the following.

 
1. Terrace farming A. Deposition of top soil in rivers and lakes
2. Afforestation B. Steps on hill sides
3. Deforestation C. Planting new trees
4. Silting D. Cutting down trees
  1. 1 - B, 2 - D, 3 - C, 4 - A

  2. 1 - B, 2 - C, 3 - A, 4 - D

  3. 1 - B, 2 - C, 3 - D, 4 - A

  4. 1 - D, 2 - C, 3 - D, 4 - A

  5. 1 - C, 2 - A, 3 - B, 4 - D


Correct Option: C
Explanation:

This is the right answer. As terrace farming is done by cutting the hill slopes into steps or terraces. Afforestation is planting new trees. Deforestation is cutting down of the trees and deposition of top soil in rivers and lakes is called silting.

Which of the following activities should not be done to preserve natural resources?

  1. Recycling materials such as paper and metals.

  2. Using organic manure to maintain the fertility of soil.

  3. Using fertilizers and pesticides excessively in farms.

  4. We should conserve natural resources like water and plants.

  5. Use public transport instead of using cars.


Correct Option: C
Explanation:

No, we should avoid using fertilizers and pesticides. Over use of fertilizers and pesticides causes pollution and food safety problems. It also has harmful effects on the soil organisms too.

Match the following.

 
1. Soil Conservation A. Sliding away of loose rocks down the slope of a hill
2. Land slide B. Deposition of topsoil into rivers and lakes
3. Soil erosion C. Protecting the soil
4. Silting D. Removing of top soil
  1. 1 - C, 2 - A, 3 - D, 4 - B

  2. 1 - C, 2 - A, 3 - B, 4 - D

  3. 1 - C, 2 - B, 3 - A, 4 - D

  4. 1 - D, 2 - A, 3 - B, 4 - C

  5. 1 - B, 2 - A, 3 - C, 4 - D


Correct Option: A
Explanation:

This is a right answer. Soil conservation is protecting the soil from erosion.  Land slide is the sliding away of loose rocks down the slope of a hill. Soil erosion is the removal of top soil by natural forces like wind water and rain and deposition of top soil into rivers and lakes is called silting.

I am a chemical, I get sprayed in fields to kill natural enemies. I am harmful to the natural enemies but not to crops and humans, but my overuse may destroy the crop and harmful to humans too. Who am I?

  1. Compost

  2. Manure

  3. Bio fertilizers

  4. Pesticides

  5. Organic fertilizers


Correct Option: D
Explanation:

Pesticides are chemicals, get sprayed in fields to kill natural enemies like insects.  It is harmful to the natural enemies but not to crops and humans. Its over use may destroy the crop and can also be harmful to humans too.  So this is the correct answer.

Growing different types of crops in a piece of land in different seasons is called ___________.

  1. mono culture

  2. irrigation

  3. crop rotation

  4. manuring

  5. intercropping


Correct Option: C
Explanation:

Crop rotation is planting different crops each year on a piece of land to keep the soil productivity, control the soil erosion, and to decrease the pest and diseases. So this is the right answer.

Which of the following is not a natural resource?

  1. Soil

  2. Iron

  3. Plants

  4. Petroleum

  5. Paper


Correct Option: E
Explanation:

Paper is not a natural resource as it is made up of wood.

Which of the following is the correct statement?

  1. Metals, minerals and petroleum are artificial resources.

  2. Water and soil are not essential for plant and animals.

  3. Thick growth of plants and trees is called desert.

  4. Use of manure and fertilizers increases the crop yield.

  5. Plants need average soil to grow.


Correct Option: D
Explanation:

Yes, use of manure and fertilizers increases the crop yield. This is the correct statement.

Which of the following is not the correct statement?

  1. Ploughing makes the soil loose.

  2. Poor soil will give poor crops.

  3. Animals and plants cannot live without soil.

  4. Allowing the soil from being washed away is called soil erosion.

  5. Formation of soil takes lot of time.


Correct Option: D
Explanation:

No, protecting the soil from being washed away is called soil erosion.This is the incorrect statement.

Match the following.

 
1. Soil A. Coal, gold,copper
2. Forest B. Fruits, vegetables, crops
3. Mines C. Wood, herbs, wild animals
  1. 1 - A, 2 - B, 3 - C

  2. 1 - B, 2 - A, 3 - C

  3. 1 - B, 2 - C, 3 - A

  4. 1 - C, 2 - B, 3 - A

  5. 1 - C, 2 - A, 3 - B


Correct Option: C
Explanation:

This is the right answer. Soil grows fruits, vegetable and crops. In forest we get wood, herbs, and wild animals and  in mines we get coal, gold, and copper.

Match the following.

 
1. Fossil fuel A. Tree planting festival
2. Natural resource B. Coal and petroleum
3. Crop rotation C. Land, water, forest
4. Van mahotsav D. Helps in maintaining the soil mineral content
  1. 1 - C, 2 - B, 3 - D, 4 - A

  2. 1 - B, 2 - C, 3 - A, 4 - D

  3. 1 - B, 2 - C, 3 - D, 4 - A

  4. 1 - C, 2 - B, 3 - A, 4 - D

  5. 1 - A, 2 - C, 3 - D, 4 - B


Correct Option: C
Explanation:

This is the correct answer.Coal and petroleum are fossil fuels.Land water and forest are our natural resources.Crop rotation helps in maintaining the soil mineral content.Van Mahotsav is a tree planting festival started by the government for the conservation of forest and soil.

Match the following.

 
1. Purify the air we breathe A. Granite
2. An agent of soil erosion B. Plants
3. Used to make kitchen counter C. Nitrogen
4. A component in fertilizer D. Wind
  1. 1 - B, 2 - D, 3 - C, 4 - A

  2. 1 - B, 2 - D, 3 - A, 4 - C

  3. 1 - C, 2 - B, 3 - A, 4 - C

  4. 1 - B, 2 - C, 3 - D, 4 - A

  5. 1 - C, 2 - A, 3 - D, 4 - B


Correct Option: B
Explanation:

This is the correct answer. Plants purify the air we breathe. Wind is an agent of soil erosion. The topsoil blown away by strong winds leaving behind the land barren.Granite is a kind of stone used to make kitchen counter and nitrogen is one of the component of fertilizer.

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