Biological Sciences MCQs (Set 1)

21. What is the gas that human breathe?

  • A. Carbon Dioxide
  • B. Oxygen
  • C. Carbon monoxide
  • D. Nitrogen
View Answer
Correct Answer:
B. Oxygen

Explanation:
……

22. A cockroach has _________________.

  • A. One pair of walking legs
  • B. Two pairs of walking legs
  • C. Three pairs of walking legs
  • D. Four pairs of walking legs
View Answer
Correct Answer:
C. Three pairs of walking legs

Explanation:
……

23. A ‘bat’ is a _____________.

  • A. Mammal
  • B. Reptile
  • C. Amphibian
  • D. Avian
View Answer
Correct Answer:
A. Mammal

Explanation:
……

24. Which of the following is known as ‘graveyard of red blood cells’?

  • A. Spleen
  • B. Liver
  • C. Bone marrow
  • D. Appendix
View Answer
Correct Answer:
A. Spleen

Explanation:
……

25. Which of the following is responsible for converting milk into curd?

  • A. Virus
  • B. Yeast
  • C. Fungi
  • D. Bacteria
View Answer
Correct Answer:
D. Bacteria

Explanation:
……

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