CBSE Class VIII Biology Assignments : CROP PRODUCTION AND ITS MANAGEMENT
(III) Choose the correct answer:
1. A Rabi crop: a) Rice b) Maize c) Wheat
2. A chemical fertilizer: a) Compost b) Bark of neem c) NPK
3. An implement used weeding: a) Axe b) Cultivator c) Trowel
4. Which of the following is not a method to maintain the fertility of soil?
a) Crop rotation b) Multiple cropping c) Fallow method
5. Which one of the following is not true about ploughing: a) Loosens the soil b) Aerates the soil c) Makes the soil hard
(IV) Answer the following –
1. Why is it necessary to sow seeds at an appropriate depth?
2. What are the two main crop seasons? Give few examples of crops grown in each season.
3. What are manures and fertilisers? Give exmples of types of fertilisers.
4. Give a brief account on storage of grains.
5. Why is drip irrigation considered as good method of watering plants?
6. Write the necessity of weeding, How it is done?
7. It is recommended to use manure instead of chemical fertilisers. Why?
8. Define agriculture and agricultural practices.
9. What are rabi crops?
10. Write agricultural practices required for growing crops.
11. What is soil made up of ?
12. Write short note on ”SOWING”and “SEED DRILL”.
13. What is crop production?
14. What is manuring? Why is it important?
15. How do farmers prepare manure?
16. What are the advantages of manure?
17. Why is overuse of fertilizer harmful?
18. How do leguminous plants help in increasing the nitrogen content of the soil?
19. Define irrigation. How is it done ?
20. Why is the minimum use of pesticides advised?
21. What is harvesting? What are its different methods?
22. What is winnowing? How is it done?
23. Why do we sundried the grains before storing?
24. What is green revolution?
25. Why were Mexican wheat introduced in India?
26.Define – Hybridization , Emasculation .
27. Why is cross breeding done?
28. Where is hybridization done?
29. How can we provide food to a large number of people in our country?
30. Why can paddy not be grown in the winter season?
31. Why do some plants grow better than others?
32. Explain how fertilizers and manures are different from each other.
33. Give two differences between
(I) Fill in the blanks –
1.BHC and malathion are ______________.
2.Big pieces of soil formed after ploughing are _____________.
3.Raising crops by providing organic manure and applying biological control is _____________
4. Rabi crops are the crops sown in __________ season.
5.The practice of sowing seeds by hand is known as _____________.
6.__________ crops are generally planted in November.
7. Plough and cultivator are the example of agricultural___________.
8.___________ is the process of placing seeds in the soil.
9.Animals that damage crops are called___________
10.________are the undesirable plants that grow alongside the crop.
11. Excess water on the fields may cause a condition called___________.
12.____________ bacteria in the root nodules of leguminous plants helps in fixing atmospheric nitrogen.
13. Bulk storage of grains is done in granaries and ___________.
II. Arrange the following agricultural practices in a proper sequence in the form of a flow chart –
1. Wheat crop in a field
1.BHC and malathion are ______________.
2.Big pieces of soil formed after ploughing are _____________.
3.Raising crops by providing organic manure and applying biological control is _____________
4. Rabi crops are the crops sown in __________ season.
5.The practice of sowing seeds by hand is known as _____________.
6.__________ crops are generally planted in November.
7. Plough and cultivator are the example of agricultural___________.
8.___________ is the process of placing seeds in the soil.
9.Animals that damage crops are called___________
10.________are the undesirable plants that grow alongside the crop.
11. Excess water on the fields may cause a condition called___________.
12.____________ bacteria in the root nodules of leguminous plants helps in fixing atmospheric nitrogen.
13. Bulk storage of grains is done in granaries and ___________.
II. Arrange the following agricultural practices in a proper sequence in the form of a flow chart –
1. Wheat crop in a field
2. Manuring
3. Preparation of soil
4. Ploughing
5. Harvesting
6. Winnowing
7. Weeding
8. Irrigation
9. Sowing
10. Storage
(III) Choose the correct answer:
1. A Rabi crop: a) Rice b) Maize c) Wheat
2. A chemical fertilizer: a) Compost b) Bark of neem c) NPK
3. An implement used weeding: a) Axe b) Cultivator c) Trowel
4. Which of the following is not a method to maintain the fertility of soil?
a) Crop rotation b) Multiple cropping c) Fallow method
5. Which one of the following is not true about ploughing: a) Loosens the soil b) Aerates the soil c) Makes the soil hard
(IV) Answer the following –
1. Why is it necessary to sow seeds at an appropriate depth?
2. What are the two main crop seasons? Give few examples of crops grown in each season.
3. What are manures and fertilisers? Give exmples of types of fertilisers.
4. Give a brief account on storage of grains.
5. Why is drip irrigation considered as good method of watering plants?
6. Write the necessity of weeding, How it is done?
7. It is recommended to use manure instead of chemical fertilisers. Why?
8. Define agriculture and agricultural practices.
9. What are rabi crops?
10. Write agricultural practices required for growing crops.
11. What is soil made up of ?
12. Write short note on ”SOWING”and “SEED DRILL”.
13. What is crop production?
14. What is manuring? Why is it important?
15. How do farmers prepare manure?
16. What are the advantages of manure?
17. Why is overuse of fertilizer harmful?
18. How do leguminous plants help in increasing the nitrogen content of the soil?
19. Define irrigation. How is it done ?
20. Why is the minimum use of pesticides advised?
21. What is harvesting? What are its different methods?
22. What is winnowing? How is it done?
23. Why do we sundried the grains before storing?
24. What is green revolution?
25. Why were Mexican wheat introduced in India?
26.Define – Hybridization , Emasculation .
27. Why is cross breeding done?
28. Where is hybridization done?
29. How can we provide food to a large number of people in our country?
30. Why can paddy not be grown in the winter season?
31. Why do some plants grow better than others?
32. Explain how fertilizers and manures are different from each other.
33. Give two differences between
(a) Threshing and winnowing.(b) Fertiliser and manure. (c) Rabi crop and Kharif crop
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