Class 8 science chapter 1 question 18-20

18. Question
State one advantages of growing a leguminous crop between two cereals
crops.
Answer
Rotation of crops (leguminous and non-leguminous crops) in the same
field replenishes the soil with nitrogen naturally and increases the soil
fertility.
19. Question
Name the nitrogen-fixing bacteria present in root nodules of
leguminous plants.
Answer
The nitrogen-fixing bacteria present in root nodules of leguminous
plants is rhizobium bacteria.
20. Question
Which agricultural practice comes first: harvesting or weeding?
Answer
Agricultural practice weeding comes first .

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