Weedicides are chemicals that are sprayed on crop fields to remove weeds. A farmer wanted to test the effect of two different weedicides on wheat production. He sprayed each weedicide on two different fields. No weedicide was sprayed on field 3. The graph shows the production of wheat crop from each field over two years. The farmer’s friend suggested that the farmer should have tested Weedicide 1 on wheat field and Weedicide 2 on mustard field. Will this suggestion help improve the experiment? Explain your answer.

The undesirable plants that grow along with the crops are called weeds. These weeds feed on the nutrients provided to the crops and thus reduce the supply of nutrients to the crops, thereby hindering their growth. The growth of these weeds can be limited by applying weedicides. Weedicides are chemicals that are sprayed over the fields to get rid of weeds. Selective weedicides kill specific targets while leaving the desired crop relatively unharmed. The suggestion given by the farmer's friend about testing Weedicide 1 on wheat field and Weedicide 2 on mustard field will not help in improving the experiment. This is because the production of wheat and mustard vary. Hence, to compare the effect of two different weedicides, the crop should remain the same.

Soham investigates the water holding capacity of four different types of soils. He sets up an experiment for each type of soil as shown in the diagram. Soham records his observation in a table. Soil type Clay Loam Sand Silt Amount of water added to the soil (ml) 150 150 150 150 Amount of water collected in the measuring cylinder (ml) 30 60 105 50 Soham added the same amount of water to each type of soil. State one more thing that Soham needs to keep the same in his experiment.

Soil is the loose surface material that covers most land. Clay, loam, sand and silt are the different types of soil. They are differentiated based on the size of particles of soil. In the experiment conducted by Soham to check the soil water retention capacity of different soils, he adds same amount of water to each type of soil. Along with this, amount of each soil type on the filter paper must remain the same to get an accurate result.

HARD

8th CBSE

IMPORTANT

Earn 100

Weedicides are chemicals that are sprayed on crop fields to remove weeds. A farmer wanted to test the effect of two different weedicides on wheat production. He sprayed each weedicide on two different fields. No weedicide was sprayed on field 3.

Why did the farmer not spray any weedicide on Field 3?

Important Questions on Crop Production and Management

HARD

8th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class VIII>Chapter 1 - Crop Production and Management>Exercise>Q 2

Weedicides are chemicals that are sprayed on crop fields to remove weeds. A farmer wanted to test the effect of two different weedicides on wheat production. He sprayed each weedicide on two different fields. No weedicide was sprayed on field 3.

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The graph shows the production of wheat crop from each field over two years.

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What can the farmer conclude from his tests?

HARD

8th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class VIII>Chapter 1 - Crop Production and Management>Exercise>Q 3

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The graph shows the production of wheat crop from each field over two years.

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The farmer’s friend suggested that the farmer should have tested Weedicide 1 on wheat field and Weedicide 2 on mustard field. Will this suggestion help improve the experiment? Explain your answer.

MEDIUM

8th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class VIII>Chapter 1 - Crop Production and Management>Exercise>Q 4

Why are weedicides generally sprayed on weeds before they start producing flowers and seeds?

EASY

8th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class VIII>Chapter 1 - Crop Production and Management>Exercise>Q 5

A farmer wants to grow crops in his field between the months of June and July. The chart below shows a list of crops and different agricultural practices.

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Select two crops from the list that grow best during June and July.

MEDIUM

8th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class VIII>Chapter 1 - Crop Production and Management>Exercise>Q 6

The farmer prepared the soil in his field by turning and loosening the soil.

How does turning and loosening the soil help in growing plants?

MEDIUM

8th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class VIII>Chapter 1 - Crop Production and Management>Exercise>Q 7

The chart below shows a list of crops and different agricultural practices.

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Farmers follow a sequence of agricultural practices to grow crops. A part of the sequence is shown below. Choose an appropriate agricultural practice from the chart above to fill in the box.

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MEDIUM

8th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class VIII>Chapter 1 - Crop Production and Management>Exercise>Q 8

Soham investigates the water holding capacity of four different types of soils. He sets up an experiment for each type of soil as shown in the diagram. Soham records his observation in a table.

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	Soil type
	Clay	Loam	Sand	Silt
Amount of water added to the soil (ml)	$150$	$150$	$150$	$150$
Amount of water collected in the measuring cylinder (ml)	$30$	$60$	$105$	$50$

Which type of soil absorbs the most water?

MEDIUM

8th CBSE

IMPORTANT

Science Textbook of Competency Based Questions for Class VIII>Chapter 1 - Crop Production and Management>Exercise>Q 9

Soham investigates the water holding capacity of four different types of soils. He sets up an experiment for each type of soil as shown in the diagram. Soham records his observation in a table.

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	Soil type
	Clay	Loam	Sand	Silt
Amount of water added to the soil (ml)	$150$	$150$	$150$	$150$
Amount of water collected in the measuring cylinder (ml)	$30$	$60$	$105$	$50$

Soham added the same amount of water to each type of soil. State one more thing that Soham needs to keep the same in his experiment.

Important Questions on Crop Production and Management

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