English, asked by gbfgrhdffh, 8 months ago

1. which is not a method for the conservation of natural resources? encourage the use of organic fertilizers to avoid wastage of energy take part in deforestation 2. name the term that can collectively refer to consist of all living and non-living things that surround an organism resource environment value 3. from the following which one can be described as the best example for having an economical value a beautiful sunset good weather resources like iron and manganese

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Answered by giriaishik123
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Answer:

12. Seed drill, because it is a modern agricultural implement unlike

the others which are all traditional tools.

13. The field will be watered, tilled and ploughed before sowing seeds.

14. (i) False: Apart from good quality seeds, using appropriate

agricultural practices are important for getting higher

yield.

(ii) False: It actually enriches the soil.

(iii) False: Some crop plants need transplantation.

(iv) False: Rhizobium (bacteria) present in the cells of root

nodules of leguminous, plants fix nitrogen.

(v) True.

15. October to March.

16. Loosening the soil/maintaining high moisture levels in soil.

SHORT ANSWER QUESTIONS

17. Kharif : Rice or Soyabean, Rabi : Pea or Wheat.

Pea/Soyabean are legumes that will fix nitrogen with the help of

Rhizobium.

Answers

12/04/18

ANSWERS 111

18. (i)-c; (ii)-a; (iii)-b; (iv)-d

19. Crops cultivated without using any chemicals like fertilisers,

pesticides, weedicides etc. are called organic foods.

20.

Living : Seed, Earthworm, Rhizobium, Microbes, Ox

Non living: Plough, Urea, NPK, Manure, Hoe

21. (a) Seed drill.

(b) The advantages are,

(i) seeds are sown at a uniform distance and depth to avoid

over crowding.

(ii) after sowing, seeds are covered by soil which prevent them

from being eaten by birds.

(iii) It saves time and labour.

22. (a) Animal husbandry.

(b) Animals are provided with proper food, shelter and care.

23. Khariff : Maize , Paddy, Groundnut, Cotton.

Rabi : Mustard, Pea, Wheat, Gram.

12/04/18

112 EXEMPLAR PROBLEMS

LONG ANSWER QUESTIONS

24. (i) He did not use good quality seeds.

(ii) His field was not well irrigated.

(iii) Manures/fertilisers were not properly applied.

(iv) Weeds were not removed. More can be added to the list.

25. The following items are required – seeds and seedlings of vegetable

plants from nursery, kitchen waste, water.

Steps for raising the garden:

1. Kitchen waste will be collected and composted in a pit.

2. A patch of land will be identified for the garden.

3. Soil will be dug up and levelled with the help of a spade.

4. Sowing of seeds / transplanting of seedlings.

5. Select seeds/seedlings as per the season. Water the plants

regularly with a water-can.

6. Compost will be applied.

7. Weeds will be removed periodically with the help of Khurpi.

26. (a) Rainy season

(b) Seeds are first grown in a nursery and later seedlings are

transplanted in the field.

(c) Grains are sun dried to reduce the moisture content and

later stored in jute bags or grain silos.

27. (i) SILOS (ii) THRESHING (iii) IRRIGATION (iv) RIVER

Activity carried out in fields after maturation of crop-Harvesting

28. (i) Use of fertilisers and weedicides are hazardous to

environment. Tractor causes air pollution.

(ii) Modern agricultural implements saves on both time and

labour as compared to traditional equipments.

(iii) An example of a weedicide is 2, 4–D. Farmers should cover

their mouth and nose while spraying weedicides as they

can cause health hazards.

29. Students may come up with practical solutions during the course

of discussion.

30. Tilling and ploughing, sowing, manuring, irrigation, de–weeding,

harvesting.

12/04/18

ANSWERS 113

Chapter 2

MULTIPLE CHOICE QUESTIONS

1. b 2. b 3. c 4. d

5. b 6. b 7. b

VERY SHORT ANSWER QUESTIONS

8. (a) antibodies (c) Anthrax

(b) tuberculosis (d) fermentation

9. (a) Preservatives (c) Carrier/vector

(b) Rhizobium (d) Antibiotics

10. (a)-(iii); (b) (ii); (c)-(iv); (d)-(i)

11. Baking bread/manufacture of alcoholic drinks

12. Fermentation

13. Nitrogen

14. Tuberculosis is an air-borne disease which easily spreads when

the infected person coughs.

15. If the child is suffering from diarrhoea, the orally given vaccine

may be excreted out because of frequent motions.

16. Oil prevents bacteria from attacking the pickle and spoiling it.

SHORT ANSWER QUESTIONS

17. (a)-(iv), (b)-(iii), (c)-(i), (d)-(ii)

18. Friendly Harmful

Yeast Malarial parasite

Lactobacillus Bread mould

Rhizobium Bacillus anthracis

12/04/18

114 EXEMPLAR PROBLEMS

19. The probable reason is that the chaat was contaminated by

pathogenic microbes due to unhygienic conditions near the shop

or the utensil used for serving could have contaminated.

20. The ‘unused kneaded flour’, if left in warm conditions, gets

infected by microbes which cause fermentation and spoils the

flour. The pooris would remain in relatively good condition

because they were deep fried in heated oil that kills microbes.

21. (a) Polio/Chicken Pox/Influenza

(b) Virus can reproduce only inside the cells of host.

LONG ANSWER QUESTIONS

22. (a) Yellow vein mosaic of lady’s finger/okra

(b) Virus

(c) The disease spreads from one plant to another through

insects.

(d) (i) Citrus canker caused by bacteria (ii) Rust of wheat caused

by fungus or any other disease

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