ECOLOGY
CHEMICAL CYCLES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Nitrates are reabsorbed by the animal.
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Nitrogen is converted into ammonia.
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Nitrogen is released back into the environment.
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Nitrates are converted into proteins.
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Detailed explanation-1: -When an organism excretes waste or dies, the nitrogen in its tissues is in the form of organic nitrogen (e.g. amino acids, DNA). Various fungi and prokaryotes then decompose the tissue and release inorganic nitrogen back into the ecosystem as ammonia in the process known as ammonification.
Detailed explanation-2: -returned to the soil by decomposition. When an animal dies, most of the nitrogen in the animal’s tissues are returned to the soil by decomposition. The nitrogen in the dead animals’ tissues is in the form of organic nitrogen (for example, in proteins and nucleic acids).
Detailed explanation-3: -The animals must detoxify ammonia by converting it into a relatively nontoxic form such as urea or uric acid. Mammals, including humans, produce urea, whereas reptiles and many terrestrial invertebrates produce uric acid. Animals that secrete urea as the primary nitrogenous waste material are called ureotelic animals.
Detailed explanation-4: -Animals excrete a variety of nitrogen waste products, but ammonia, urea and uric acid predominate.