Identify the correct statement about plant diseases: MCQ with Answer and Explanation

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Identify the correct statement about plant diseases:

A. Late blight of potato is caused by a bacterium.

B. Citrus canker is caused by a virus.

C. Tobacco mosaic disease is caused by a virus.

D. Black rust of wheat is caused by a bacterium.

Answer: Option C

Solution (By JKExamLibrary)

Tobacco mosaic is viral. Citrus canker is bacterial, late blight is an oomycete (fungus-like), black rust is fungal.

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Question #1

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Consider the following statements about vitamins:
1. Vitamin C deficiency causes scurvy.
2. Vitamin D deficiency causes beriberi.
3. Vitamin A deficiency causes night blindness.
Which of the above is/are correct?

A. 1 and 3 only

B. 1, 2, and 3

C. 1 and 2 only

D. 2 and 3 only

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Correct Answer: Option A

Explanation:
Scurvy is vitamin C deficiency; night blindness is vitamin A deficiency. Beriberi is due to vitamin B₁ deficiency, not D. So 1 and 3 are correct.

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Question #2

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Consider statements about human digestion: 1. Saliva contains the enzyme ptyalin. 2. The stomach secretes hydrochloric acid. 3. Bile is produced by the gall bladder. Which are correct?

A. 1 and 3 only

B. 1 and 2 only

C. 2 and 3 only

D. 1, 2 and 3

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Correct Answer: Option B

Explanation:
Salivary glands secrete saliva containing salivary amylase (ptyalin) which begins starch digestion. The stomach's gastric glands secrete HCl, creating an acidic medium for pepsin action. Bile is synthesized continuously by the liver, stored, and concentrated in the gall bladder, but not produced by it. Therefore, statements 1 and 2 are correct, while 3 is false.

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Question #3

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Which of the following is an example of a rabi crop?

A. Rice

B. Wheat

C. Maize

D. Sugarcane

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Correct Answer: Option B

Explanation:
Rabi crops are sown in winter (October-December) and harvested in spring (March-April). Wheat, gram, mustard, pea are common rabi crops. Rice, maize, and sugarcane are kharif crops, sown with the onset of monsoon and harvested in autumn. This distinction is based on seasonal cultivation patterns in Indian agriculture. Rabi crops require cool growing season and warm harvest season.

This question belongs to: Science Biology

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