Which of the following is a bacterial STD? MCQ with Answer and Explanation

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Which of the following is a bacterial STD?

A. Syphilis

B. HIV/AIDS

C. Hepatitis B

D. Genital herpes

Answer: Option A

Solution (By JKSSB Mock Tests)

Syphilis is caused by the spirochete Treponema pallidum and is curable with antibiotics. Hepatitis B and HIV are viral, genital herpes is caused by herpes simplex virus. Gonorrhea and chlamydia are other bacterial STDs. Early diagnosis and treatment prevent serious complications like neurological damage and congenital syphilis.

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Question #1

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Consider statements about plant stems: 1. Nodes are the regions where leaves arise. 2. Internodes are the regions between nodes. 3. All stems grow underground. Which are correct?

A. 1 and 2 only

B. 1 and 3 only

C. 1, 2 and 3

D. 2 and 3 only

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Correct Answer: Option A

Explanation:
The stem is characterized by the presence of nodes, which are the junctions where leaves and buds arise, and internodes, the segments between two nodes. While some stems are modified to grow underground (like potatoes or onions) for storage or perennation, the primary and most common form of the stem is aerial, growing above the ground. Statements 1 and 2 are correct.

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Question #2

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The hormone that stimulates the kidney to convert 25-hydroxyvitamin D to active 1,25-dihydroxyvitamin D is:

A. TSH

B. Calcitonin

C. ACTH

D. PTH

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Correct Answer: Option D

Explanation:
Parathyroid hormone (PTH) activates the enzyme 1-α-hydroxylase in the kidney, converting vitamin D to its active form, which then increases calcium absorption.

This question belongs to: Science Biology

Question #3

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Assertion (A): Plants carry out photosynthesis during the day and respiration at night.
Reason (R): Photosynthesis requires light, while respiration occurs continuously.

A. A is false, but R is true.

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

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

D. A is true, but R is false.

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Correct Answer: Option A

Explanation:
Respiration occurs 24/7, while photosynthesis only in light. The statement implies they alternate, which is false. R is true: photosynthesis needs light, respiration is continuous. So A is false, R true.

This question belongs to: Science Biology

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