Some marine fishes possess salt-excreting organs known as:
Correct answer: D. Rectal gland
- A. Thyroid gland
- B. Pituitary gland
- C. Adrenal gland
- D. Rectal gland
Explanation
The correct answer is the rectal gland, which is a specialized salt-secreting organ found in cartilaginous fishes like sharks. This gland helps these marine fishes maintain salt balance in their bodies. The other options, including the thyroid, pituitary, and adrenal glands, are not involved in salt excretion in marine fishes.
This question appeared on the ETEA MDCAT 2019 paper, which you can sit online with every answer explained.
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About Excretion
Excretion removes metabolic wastes such as carbon dioxide, urea and excess salts, and differs from egestion, which removes undigested food. Questions cover kidney structure, nephron ultrafiltration, selective reabsorption and urine formation, along with the excretory roles of the lungs, skin and liver in maintaining homeostasis.
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