Answers for “Biological control of the pests” With explanations

Question 14-17:

14. B (para 1, last 3 lines: “proving to be counter-productive. Apart from engendering
widespread ecological disorders, pesticides have contributed to the emergence of a new
breed of chemical-resistant, highly lethal superbugs”)

15. A (para 2, first 2 lines: “According to a recent study by the Food and Agriculture
Organisation (FAO), more than 300 species of agricultural pests have developed
resistance to a wide range of potent chemicals”)

16. D (para 4, line 4-5: “agriculture, the farmers avidly took to pesticides as a sure measure to
boost crop yield. The insecticide was applied eight times a year in”)

17. D (para 5, first 4 lines: “By the mid-1960s, the situation took an alarming turn with the
outbreak of four more new pests, necessitating pesticide spraying to such an extent that
50% of the financial outlay on cotton production was accounted for by pesticides.”)

Question 18-21:


19. YES (para 2, last 3 lines: “resistance to a wide range of potent chemicals. Not to be left
behind are the disease-spreading pests, about 100 species of which have become immune
to a variety of insecticides now in use.”)

20. NO (para 3, last 3 lines: “Because of their tremendous breeding potential and genetic
diversity, many pests are known to withstand synthetic chemicals and bear offspring with
a built-in resistance to pesticides.”)

21. YES (para 7, last 2 lines: “When handled by experts, bio-control is safe, non—polluting
and self-dispersing.”)

Question 22- 26:

22. D (para 9, last 2 lines: “that prey on „disapene scale‟ insects — notorious defoliants of
fruit trees in the US and India”)

23. H (para 10, line 5-6: “predator indigenous to India, Neodumetia sangawani, was found
useful in controlling the Rhodes grass-scale insect that was devouring forage”)

24. C (para 10, line 2-3: “by the following examples. In The late 1960s, when Sri Lanka‟s
flourishing coconut groves were plagued by leaf-mining hispides, a larval parasite”)

25. E (para 9, line 5-6: “supported by CIBC, is now trying out an Argentinian weevil for the
eradication of water hyacinth, another dangerous weed”)

26. B (para 10, last 3 lines: “12-kilometre- long canal from the clutches of the weed Salvinia
molesta, popularly called „African Payal‟ in Kerala. About 30,000 hectares of rice fields
in Kerala are infested by this weed.”)

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