Question

13. Assertion (A) : Inter cropping prevents pests.
Reason (R): Plant pests can be controlled biologically by their natural parasites and pathogens.
14. Assertion (A): When the displacement of a body is directly proportional to the square of the
time. Then the body is moving with uniform acceleration
Reason (R): The slope of velocity-time graph with time axis gives acceleration
TOT​

Answer 1

Answer:

13.Both A and R are correct.

Answer 2

Answer:

13. Both (A) and (R) are correct but (R) is not the correct explanation of (A).

14. Both (A) and (R) are correct but (R) is not the correct explanation of (A).

Explanation:

• The practice of growing more than one crop in the vicinity of each other is called intercropping. This practice helps in the prevention of pests in addition to greater yield production. Either chemicals or physical structures of intercrops repel the pests from production crops.
• There are three biological methods for pest control; conservation (inoculative, regular re-establishment of natural enemies), importation (classical, the introduction of natural enemies in the crops), and augmentation (inductive, large population of natural enemies are introduced for the protection of crops). The natural enemies are parasitoids, predators, and competitors.
• It is newton’s second law of motion which states that the displacement is directly proportional to the square of the time taken in uniformly accelerated motion.  S = ut + (½)at²
• Yes, acceleration is calculated by the slope of the velocity-time graph.

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