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Microbes in Human Welfare — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYMicrobes in Human Welfare1 Mark
MCQ
Two statements are given-one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below.
  • A
    Both assertion and reason are true and reason is the correct explanation of assertion.
  • B
    Both assertion and reason are true but reason is not the correct explanation of assertion.
  • C
    Assertion is true but reason is false.
  • D
    Both assertion and reason are false.

    Assertion: Intercropping checks the population of insects.

    Reason: Plant pests can be controlled biologically by their natural parasites and pathogens.

✓

Answer

  1. Both assertion and reason are true but reason is not the correct explanation of assertion.

Solution:

Intercropping keeps the population ofinsects at low level. ln intercropping, the pest-susceptible crop is grown alongwith other crops which are repellent to pests. Plant pests are controlled biologically through the means of their natural parasites and pathogens. For example, Baculovirus heliothis can control cotton bollwonn, Bacillus thuringenesis can control the cabbage hooper and Entomophthora ignobilis can control the green peach aphid of potato.

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