Choose the correct alternative from the following.
Assertion (A) : Earthworms are not good for agriculture.
Reason (R) : Earthworms break down the soil into fine particles and make it soft.
Answer: D
Earthworms help in agriculture because they make the soil soft and porous.
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Assertion (A) : DDT has nowadays lost its use as an insecticide.
Reason (R) : DDT is harmful to man.
Answer: B
DDT has lost its use as a insecticide because insects have developed immunity against it.
However, it is true that DDT is harmful to man.
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Assertion (A) : Seeds should be treated with fungicide before being sown.
Reason (R) : Seeds do not germinate, unless treated with fungicide solution.
Answer: C
Seeds are treated with fungicides before sowing to avoid seed-borne diseases.
However, seeds may germinate, even if not treated with fungicide solution.
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Assertion (A) : The body of the fish is streamlined.
Reason (R) : The streamlined body helps the fish to cut its way through the water.
Answer: A
The fish possesses a streamlined body which helps it to cut its way through the water.
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Assertion (A) : Milk production in India is low a compared to other countries of the world.
Reason (R) : The animal rearers in India are poor.
Answer: C
Milk production in India is low as compared to other countries of the world because of lack of good breed and improper feed. However, R is untrue.
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Assertion:
Insatiably curious children usually grow up to be genius.
RI. They ask so many questions that they learn about most of the things much earlier than an average child.
RII. Only a genius mind is full of curiosity.
Answer: A
RI can be a valid reason because it explains the process by which a child becomes a genius. RII is invalid because we cannot say that "Only a genius mind is curious".
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Assertion (A) : Goitre is a common disease in mountainous regions.
Reason (R) : The diet of the people in mountains lacks iodine content.
Answer: A
Goitre is commonly caused in mountainous regions because goitre is caused by deficiency of iodine and diet in mountainous areas lacks iodine.
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Assertion (A) : Roughage prevents constipation.
Reason (R) : Roughage adds bulk to the food.
Answer: A
Roughage adds bulk to the food and makes its passage through the stomach easier,
thus preventing constipation.
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Assertion (A) : Bangladesh imports jute from India.
Reason (R) : Bangladesh has most of the jute mills
Answer: C
When Bangladesh was created after partition of India, the areas of jute production went to Bangladesh while the jute mills were left in India. So, India imports raw jute from Bangladesh.
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Assertion (A) : The Steam engine was invented by James Watt.
Reason (R) : There was a problem of taking out water from flooded mines.
Answer: A
The problem of pumping out water from the flooded mines provided the need of a self working engine, which led James Watt to invent the same.
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