Question

Whales and dolphins have ___ to breathe when they come to the surface of water.

• A. villi
• B. blowholes
• C. gills
• D. fins

Answer 1

The correct option is

B

blowholes

Dolphins and whales have lungs like humans that cannot take in oxygen dissolved in water. So they come up to the surface of the water to breathe in air through their blowholes. These blowholes are nothing but nostrils at the back of their head.

Villi are small, slender, vascular projections that increase the surface area of a membrane.

All fish have external appendages called fins. Like human limbs, fins provide fish with balance, steering, and protection.

Gills are evaginated respiratory surfaces used for breathing in water. Gills are present in all amphibian larvae and in some aquatic salamanders.