Which of the following pairs is a symbiotic nitrogen fixer in leguminous plants? MCQ with Answer and Explanation

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Which of the following pairs is a symbiotic nitrogen fixer in leguminous plants?

A. Azotobacter - Wheat

B. Anabaena - Azolla

C. Rhizobium - Soybean

D. Frankia - Casuarina

Answer: Option C

Solution (By JKSSB Mock Tests)

Rhizobium species form root nodules in leguminous plants like soybean, pea, and bean, where they fix atmospheric nitrogen symbiotically. Azotobacter is free-living, Anabaena associates with Azolla (a fern), Frankia with non-leguminous plants like Casuarina and Alnus. This symbiosis reduces the need for nitrogen fertilizers in agriculture.

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Assertion (A): The pancreas is a mixed gland.
Reason (R): It has exocrine acini secreting enzymes and endocrine islets secreting hormones.

A. Both A and R are true, but R is not the correct explanation.

B. A false, R true.

C. A true, R false.

D. Both A and R are true, and R is the correct explanation.

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Correct Answer: Option D

Explanation:
The pancreas secretes digestive enzymes (exocrine) and insulin/glucagon (endocrine). The reason correctly defines why it is mixed.

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Question #2

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Which blood vessel carries blood away from the heart?

A. Artery

B. Vein

C. Venule

D. Capillary

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Correct Answer: Option A

Explanation:
Arteries (except pulmonary arteries) carry oxygenated blood away from the heart to body tissues. Pulmonary arteries carry deoxygenated blood from heart to lungs. Veins return blood to the heart. Capillaries are exchange vessels. Arteries have thick elastic walls to withstand high pressure. The aorta is the largest artery. Remember: 'A' for Artery = Away from heart.

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Question #3

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The 'Green Revolution' in India, which led to a massive increase in wheat and rice production, was primarily led by the efforts of:

A. Verghese Kurien

B. Both B and C

C. M.S. Swaminathan

D. Norman Borlaug

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Correct Answer: Option B

Explanation:
The Green Revolution in India was a period of significant agricultural transformation. Norman Borlaug, the 'father of the Green Revolution' globally, developed high-yielding, disease-resistant dwarf wheat varieties in Mexico. M.S. Swaminathan, known as the 'father of the Green Revolution in India', adapted these varieties to Indian conditions and led the scientific and administrative efforts to introduce these high-yielding varieties (along with improved irrigation and fertilizers) to Indian farmers, drastically increasing wheat and rice production.

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