The hormone that stimulates milk production after childbirth is: MCQ with Answer and Explanation

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The hormone that stimulates milk production after childbirth is:

A. Progesterone

B. Estrogen

C. Oxytocin

D. Prolactin

Answer: Option D

Solution (By JKExamLibrary)

Prolactin, from the anterior pituitary, promotes mammary gland development and milk synthesis. Oxytocin triggers milk ejection. Estrogen and progesterone prepare breasts during pregnancy but inhibit milk secretion.

This question belongs to: Science Biology

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Question #1

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Assertion (A): The SA node is called the pacemaker of the heart.
Reason (R): It generates electrical impulses that initiate the heartbeat.

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

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

C. A false, R true.

D. A true, R false.

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Correct Answer: Option A

Explanation:
The sinoatrial node spontaneously depolarizes, setting the rhythm of the heart. The reason correctly explains its role as pacemaker.

This question belongs to: Science Biology

Question #2

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The disease caused by the protozoan Plasmodium falciparum is:

A. Amoebic dysentery

B. Malaria

C. Giardiasis

D. Sleeping sickness

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Correct Answer: Option B

Explanation:
Malaria is transmitted by Anopheles mosquito; P. falciparum causes severe, often fatal malaria. Amoebic dysentery is Entamoeba, sleeping sickness Trypanosoma, giardiasis Giardia.

This question belongs to: Science Biology

Question #3

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Which of the following is a respiratory disease caused by a coronavirus?

A. Pneumonia caused by Streptococcus

B. Tuberculosis

C. COVID-19

D. Influenza

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Correct Answer: Option C

Explanation:
COVID-19 is caused by SARS-CoV-2, a novel coronavirus. Tuberculosis is bacterial (Mycobacterium). Influenza is caused by influenza viruses (Orthomyxoviridae), not coronavirus. Pneumonia can be bacterial or viral, but the question specifies Streptococcus which is bacterial. COVID-19 emerged in 2019, causing a global pandemic, primarily affecting the respiratory system.

This question belongs to: Science Biology

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