Agriculture MCQs with Answers – Practice Online – Page 47

Question 921 Water Management

In levelling, what is a reference point on the ground whose position is accurately known called?

Correct answer C. Control point

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Question 922 Plant Breeding and Genetics

What are organisms called that can make all their organic substances from simple inorganic molecules?

Correct answer D. Autotrophic

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Question 923 Soil Science

Lower leaves turn yellow and may dry as if short of water; growth is stunted, leaves and fruits shed and the whole plant yellows. These are deficiency symptoms of which nutrient?

Correct answer B. Nitrogen

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Question 924 Water Management

What is a line drawn on a map joining points of equal level or head called?

Correct answer C. Contour line

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Question 925 Plant Breeding and Genetics

Where are the giant chromosomes of Drosophila found?

Correct answer C. Salivary glands

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Question 926 Soil Science

Which items are needed for green leaves to make plant food by photosynthesis?

Correct answer D. All of the above

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Question 927 Water Management

What is the water lost by transpiration from crops plus evaporation from the adjacent soil called?

Correct answer D. A & B are correct

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Question 928 Plant Breeding and Genetics

In which organism was the role of the nucleus in controlling plant form discovered?

Correct answer D. Acetabularia

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Question 929 Soil Science

Nitrogen and sulphur oxides released by vehicles and industry dissolve in atmospheric water vapour to form nitric and sulphuric acids. In what form does this water reach and contaminate the soil?

Correct answer A. Acid rain

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Question 930 Water Management

What is the disposal of sewage by letting it flow over and soak into specially levelled farmland for cultivation called?

Correct answer C. Broad irrigation

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Question 931 Soil Science

Which of the following are moderately toxic compounds?

Correct answer D. All of the above

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Question 932 Water Management

Delta is the total depth of water a crop needs up to maturity. What is the delta of wheat?

Correct answer B. 40 cm

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Question 933 Plant Breeding and Genetics

What is a mutant bacterium that cannot grow on minimal medium but can when a particular growth factor is added called?

Correct answer D. Auxotroph

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Question 934 Soil Science

Soils can be contaminated by inorganic compounds that are highly toxic to humans and other animals. Which of these does this include?

Correct answer D. Both A and B

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Question 935 Water Management

Delta is the total depth of water a crop consumes up to maturity. What is the delta of cotton?

Correct answer A. 50 cm

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Question 936 Plant Breeding and Genetics

Why are harmful mutations not removed from the gene pool?

Correct answer D. They are recessive and carried by heterozygous individuals

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Question 937 Water Management

What is an impermeable formation that neither holds nor transmits water called?

Correct answer B. Aquifuge

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Question 938 Soil Science

Chemicals used to control diseases of crops, fruits and vegetables are , and chemicals made to control insect pests are . Which pair completes this?

Correct answer A. Fungicides, insecticides

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Question 939 Plant Breeding and Genetics

Which feature is not shared by all living organisms?

Correct answer C. Types of protein occurring in the body

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Question 940 Soil Science

Which of these can result from soil pollution?

Correct answer D. All of the above

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