Biological Sciences MCQs (Set 1)

16. What is the waste gas made that humans breathe out?

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

Explanation:
……

17. How many senses are there?

  • A. 4
  • B. 5
  • C. 6
  • D. 7
View Answer
Correct Answer:
B. 5

Explanation:
……

18. How many ribs are there in human body?

  • A. 22
  • B. 24
  • C. 26
  • D. 28
View Answer
Correct Answer:
B. 24

Explanation:
……

19. The black part of the eye is called _________.

  • A. Pupil
  • B. Pores
  • C. Iris
  • D. Retina
View Answer
Correct Answer:
A. Pupil

Explanation:
……

20. What do we call the tubes that carry blood towards the heart?

  • A. Arteries
  • B. Intestines
  • C. Veins
  • D. None of these
View Answer
Correct Answer:
C. Veins

Explanation:
……

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