The primary muscle of breathing is the: MCQ with Answer and Explanation

The primary muscle of breathing is the:
A. Diaphragm
B. Abdominal muscles
C. Pectoral muscles
D. Intercostal muscles
Answer: Option A
Solution (By JKSSB Mock Tests)
The diaphragm is a dome-shaped skeletal muscle that contracts during inspiration, flattening and increasing thoracic volume. The external intercostal muscles assist.

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Practice More Biology Questions

Question #1
The Chipko movement is associated with the conservation of:
A. Water bodies
B. Forests
C. Wildlife
D. Soil

Correct Answer: Option B


Explanation:
The Chipko movement, initiated in the 1970s in Uttarakhand (India), involved villagers (mainly women) hugging trees to prevent them from being cut down by contractors. It was a non-violent protest for forest conservation and sustainable use. Sunderlal Bahuguna was a prominent leader. It raised awareness about deforestation and environmental protection.

This question belongs to: Science Biology
Question #2
Which branch of biology deals with the study of bees?
A. Apiology
B. Entomology
C. Malacology
D. Myrmecology

Correct Answer: Option A


Explanation:
Apiology is the specific branch of zoology dedicated to the scientific study of bees, including their biology, ecology, and behavior. Malacology studies mollusks, myrmecology focuses on ants, and entomology is the broader study of all insects. Exam tip: Remember 'Api' relates to Apis, the genus of honeybees.

This question belongs to: Science Biology
Question #3
The disease caused by the protozoan Entamoeba histolytica is:
A. Malaria
B. Sleeping sickness
C. Amoebic dysentery
D. Leishmaniasis

Correct Answer: Option C


Explanation:
Amoebic dysentery (amoebiasis) is characterized by bloody, mucus-containing stools, caused by Entamoeba histolytica, transmitted through contaminated food/water. Malaria is Plasmodium, sleeping sickness Trypanosoma, leishmaniasis Leishmania.

This question belongs to: Science Biology