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6 Which of the following cropping methods maintains soil fertility?
(i) Mixed farming
(ii) Crop rotation
(iii) Mono cropping

(a) Only (i)
(b) (i) and (ii)
(c) (ii) and (iii)
(d) (i), (ii) and (iii)
7 Which of the following is a micronutrient required by plants?
(a) Sulphur
(b) Manganese
(c) Calcium
(d) Potassium

8 Which of these is/are the advantages of crop rotation?
(a) It prevents the depletion of selective nutrients.
(b) It prevents the building up of diseases and pests of a particular crop.
(c) It enhances the production by increasing the soil fertility.
(d) All the above

9 Which of these is made by using chemicals?
(a) Organic manure
(b) Biofertilizers
(c) Natural insecticides
(d) Pesticides

10 Chemical fertilizers should be replaced by bio fertilizers, because ……………..
(a) they are less expensive
(b) they are the source of soil and water pollution
(c) they are non-biodegradable
(d) they are biodegradable

Subjective

SN Questions Marks Level
1. Write an example each of inter cropping and mixed cropping. 1 E
2. State two disadvantages of fertilizers. 1 E

3. (a) What is green manure? 3 Av
(b) Arrange these statements in correct sequence of
preparation of green manure.
(i) Green plants are decomposed in soil.
(ii) Green plants are cultivated for preparing manure or
crop plant parts are used.
(iii) Plants are ploughed and mixed into the soil.
(iv) After decomposition it becomes green manure.