CBSE Class 8 Science Chapter Wise Question Bank Set E

1. Fill in the blanks:

1. The two main crop seasons are __________season and _________ season.

2. __________ crops are grown during the rainy season. (June to September)

3. ___________ crops are grown during the winter season.(October to March)

4. Paddy is a ___________ crop.

5. Wheat and mustard are ______________ crops.

6. _____________ is a crop that is grown in standing water.

7. _____________________ is the first step before growing a crop.

8. ___________ and ___________organisms are called the friends of farmers which help in loosening the soil and adding humus to the soil.

9. ______________ and ____________ are the tools used in ploughing or tilling.

10. Dry soil has to be ______________ before ploughing.

11. _______ and _________tool can be used simultaneously for weeding and loosening the soil.

12. A tractor driven implement used for ploughing a field is called __________

13. Soil can be replenished through methods like ______________ and ______

14. Transplantation of plantlets into the field is done in the cultivation of the crops like ______________________.

15. The practice of leaving the field uncultivated is called __________________

16. _______________ is an organic substance obtained from the decomposition of plant or animal waste.

17. _____________ provides a lot of humus to soil.

18. ________________ are the chemical substances rich in particular nutrients.

19. _________system is a type of irrigation more useful on the uneven land and sandy soil.

20. Freshly harvested grains are sundried to remove ____________________.

21. Large scale storage of grains is done in ____________, _____________and __________.

I. Name the following:

1. The plant nutrients found in fertilizers: ______________________________

2. Any three sources of irrigation : ___________________________________

3. The nitrogen fixing bacteria found in the root nodules of leguminous plants: _______

4. The method of separating the grains from the chaff: __________________

5. The type of irrigation in which wastage of water is less: ________________

6. An example of weedicide: ________________________

7. Two weeding tools : ____________________________________________

8. Any two harvest festivals of India: _________________________________

9. Any two traditional methods of irrigation: ___________________________

10. A machine used for harvesting as well as threshing: ___________________

11. The science dealing with the study of food, shelter and health care of domestic animals:

2 MICRORGANISMS : FRIEND AND FOE

I. Fill in the blanks:

1. The pathogens are ____________ causing organisms.

2. The antibiotic first discovered By Alexander Fleming is called ___________.

3. _____________mosquito acts as the carrier of malaria causing parasite.

4. The most commonly used algae as fertilizers is ___________________.

5. Yeast cells produce alcohol and carbon dioxide by the process called ________

6. ________________ is the carrier of dengue virus.

II. Name the following:

1. Two single celled micro-organisms: ________________________________

2. Two multicellular micro-organisms: ________________________________

3. Two diseases caused by virus: ____________________________________

4. Two diseases caused by protozoa: ________________________________

5. Some diseases caused by bacteria: _________________________________

6. Two groups of micro-organisms that live in colonies: __________________

7. The micro-organism which promote curd formation: __________________

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