Question

Which of the following aquatic animals possesses lungs as the respiratory organ?
A. Starfish
B. Whale
C. Seahorses
D. Both A and B

Answer 1

Hint: Respiration is crucial since it generates energy that is required for the body's proper functioning. Respiration gives oxygen to cells while also removing poisonous carbon dioxide. Heat is also emitted as part of the energy released by breathing. In warm-blooded animals, this heat energy contributes significantly to the body. Respiration provides energy for the creation of macromolecules required by cells, such as carbohydrates, lipids, and proteins. Anaerobic respiration is beneficial in the industrial manufacture of items such as alcohol, antibiotics, vitamins, organic acids, bakery and dairy products, tanned leather, and so on.

Complete explanation:
Option A: On a starfish, breathing or gas exchange takes place in two places. The thin skin on the tube feet' ends is the first place to look. Gas exchange also takes place in the dermal gills, commonly known as papulae. The cilia that line these gills move to produce a current.
So, option A is not correct.
Option B: Whales are mammalian creatures. They have some features in common with all animals, such as:
They are endothermic.
They inhale air through their lungs.
They produce living offspring.
They have a head of hair.
Starfish breathe through their feet, while seahorses breathe through their gills
So, option B is correct.
Option C: Seahorses, like many other fish, breathe through their gills. In return for carbon dioxide, gills take in oxygen from the water. Water enters through the mouth and exits through the gills, where the exchange occurs. The gills are made up of specialised tissue termed lamellae, which are comb-like filaments.
So, option C is not correct.
Option D: Breathing or gas exchange occurs in two sites on a starfish. The first place to look is the thin skin on the tube feet' ends. Gas exchange happens in the dermal gills as well, but whales are mammalian beings who breathe through their lungs.
So, option D is incorrect.

Therefore, Option B) is the correct answer.

Note:
Aquatic respiration is the exchange of respiratory gases with water by an aquatic organism, receiving oxygen from oxygen dissolved in water and excreting carbon dioxide and other metabolic waste products into the water.
Animals take in oxygen and expel carbon dioxide during the respiration process, which is separated into two parts. Breathing is another name for it. There are primarily two parts to this.
The procedure through which oxygen is delivered to the lungs is known as inspiration.
Expiration is the process through which carbon dioxide is released from the respiratory Organs into the atmosphere.
Internal respiration, also known as cellular respiration, is a type of breathing that occurs within the body.