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Role of Bt Bacterium as Biocontrol Agent

Which of the ...

Question

Which of the following chemical is used to kill insects that damage crops?

(a) Insecticide
(b) Manure
(c) Antiseptic
(d) Fertiliser

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Solution

The correct answer is (a) Insecticide.

Insecticides are chemicals that are sprayed over crops to kill insects.

Some examples of insecticides are D.D.T. and B.H.C.

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Similar questions

Q. After treatment sludge is used as _______________.
(a) food for animals
(b) insecticide
(c) poison to kill microbes
(d) fertiliser

Match items in column A with those in column B.

	A		B
(i)	Kharif crops	(a)	Food for cattle
(ii)	Rabi crops	(b)	Urea and super phosphate
(iii)	Chemical fertilisers	(c)	Animal excreta, cow dung, urine and plant waste
(iv)	Organic manure	(d)	Wheat, gram, pea
		(e)	Paddy and maize

What will happen if −

(a) Forests, scrub and other vegetation is reduced.

(b) Sewage carrying dangerous chemicals enters rivers.

(c) Birds eat insects which have been killed by insecticides.

(d) Poisonous substances are overused to prevent insects from destroying a crop.

(e) A dam is built in a famine-prone region.

Q. Which of the following are responsible for extinction of a species?
A. loss of habitat
B. excessive use of chemical fertilisers and pesticides
C. providing habitats for animals in zoos
D. clearing of land to plant crops and build roads

(a) all the above
(b) A, B and D
(c) both A and D
(d) only C

Q. Which method, according to you, can lead to maximum increase in crop produce in our country in future?
(a) increasing land under cultivation
(b) using more manures and fertilisers
(c) less wastage in storage
(d) using better varieties of crop plants

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Role of Bt Bacterium as Biocontrol Agent

Standard XII Biology

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