Class 8 science chapter 1 question 70-76

70 A. Question
What is irrigation? Why is irrigation necessary?
Answer
The supply of water to crops at right time is called irrigation. All the
crop plants need water for their growth. Water is important for proper
growth and development of ϐlowers, fruits and seeds of plants.
Irrigation is necessary for the absorption of nutrients by plants from
the soil. Water is absorbed by the plant roots. Along with water,
minerals and fertilizers are also absorbed.
Irrigation is necessary to provide moisture for gemination of seeds
because germination of seeds does not take place under dry conditions.
Irrigation is also necessary for healthy crop growth so as to get good
yield. Nutrients dissolved in water get transported to each part of the
plant. Water also protects the crop from both frost and hot air currents.
70 B. Question
Name the various sources of irrigation in our country.
Answer
The various sources of irrigation in our country are- wells, tubewells,
ponds, lakes, rivers, dams and canals.
Multiple Choice Questions (MCQs)
71. Question
Which of the following crops would enrich the soil with nitrogen?
A. apple
B. pea
C. paddy
D. potato
Answer
The nitrogen-ϐixing bacteria present in root nodules of leguminous
plants is rhizobium bacteria. Rotation of crops (leguminous and non￾leguminous crops) in the same ϐield replenishes the soil with nitrogen
naturally and increases the soil fertility.
72. Question
Which of the following is not a kharif crop?
A. paddy
B. mustard
C. maize
D. groundnut
Answer
The crops which are sown in the rainy season are called kharif crops.
The rainy season in India is generally from June to September. Example￾paddy, maize.
73. Question
In agriculture, broadcasting is used for:
A. ploughing the ϐields
B. rotating the crops
C. Removing the weeds
D. sowing the seeds
Answer
The sowing of seeds by hand is called broadcasting.
74. Question
Fish liver oil is rich in :
(A) Vitamin A (B) Vitamin B
(C) Vitamin C (D) Vitamin D
A. A and B
B. B and C
C. A and D
D. only D
Answer
Fish liver oil is rich in both vitamin A and vitamin D. Note: (If you
have to choose just one answer, select Vitamin D like in case of
MCQs)
75. Question
Which of the following is not grown by transplantation?
A. chillies
B. tomatoes
C. peas
D. paddy
Answer
The process of transferring the seedlings from the nursery to the main
ϐield by hand is called transplanting or transplantation. Some crops like
paddy and many vegetables like tomatoes and chillies, the seeds are not
directly sown in the ϐield’s soil.
76. Question
Which of the following is not a rabi crop?
A. soyabean
B. peas
C. wheat
D. linseed
Answer
The crops grown in winter season are called rabi crops. Examples￾wheat, gram, etc.


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