Nitrogenous wastes are produced as a result of:
Correct answer: D. Deamination
- A. Photosynthesis
- B. Ingesiton
- C. Assimilation
- D. Deamination
Explanation
Nitrogenous wastes are produced as a result of "deamination". The breakdown of amino acids releases nitrogen-containing amine groups (NH2). The liver removes these amine groups in a process called "deamination" and converts them into harmless products. The amine group is first converted into ammonia (which is toxic) and then converted into urea. Urea is non-toxic and excreted from the body by the kidneys. "Assimilation" is the movement of digested food molecules into the cells of the body where they are used. "Ingestion" is the process of taking food, drink, or another substance into the body by swallowing or absorbing it. "Photosynthesis" is the process by which green plants and certain other organisms transform light energy into chemical energy. Therefore, D is the correct option.
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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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