Discussion
Which of the following statements are true in the context of respiration in whales and dolphins ?
(A) They cannot use dissolved Oxygen.
(B) They have gills.
(C) They have large nostrils.
(D) They often come up to the water surface to breathe.
Answer: C
The true statements are (A), (C) and (D).
Whales and dolphins are mammals: they breathe air through nostrils, the blowholes on top of the head, and must come to the surface regularly to breathe. They cannot use the oxygen dissolved in water.
They have lungs, not gills, so (B) is false, and every option containing (B) is wrong.
This is why whales and dolphins can drown if they are trapped underwater, unlike fish, which take oxygen from the water through their gills.
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development