NEET-UG Biology

Nitrogen wastes and excretory organs in animals — practice questions

10 questions in the bank on this idea. Below are 10 of them, exactly as they appear in a test.

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Question 1 · difficulty L1 · recall
Excretion mainly as ammonia is called:
- A. osmoregulation
- B. ammonotelism
- C. uricotelism
- D. ureotelism
Question 2 · difficulty L1 · recall
Excretion mainly as urea is called:
- A. ammonotelism
- B. micturition
- C. ureotelism
- D. uricotelism
Question 3 · difficulty L1 · recall
Excretion mainly as uric acid is called:
- A. ammonotelism
- B. ureotelism
- C. uricotelism
- D. filtration
Question 4 · difficulty L1 · recall
Which nitrogenous waste is the principal excretory product of most mammals?
- A. Uric acid
- B. Ammonia
- C. Urea
- D. Carbon dioxide
Question 5 · difficulty L1 · recall
Animals that excrete ammonia as their main nitrogenous waste are called what?
- A. Osmoconformers
- B. Ureotelic
- C. Uricotelic
- D. Ammonotelic
Question 6 · difficulty L2 · understanding
Why is uric acid advantageous as a nitrogenous waste in many terrestrial animals that must conserve water?
- A. It can be excreted as a semisolid paste with very little water
- B. It is more soluble than ammonia
- C. It requires no metabolic energy to produce
- D. It is released directly through the lungs
Question 7 · difficulty L2 · understanding
Which excretory structure is characteristic of flatworms such as Planaria?
- A. Nephridia
- B. Flame cells
- C. Malpighian tubules
- D. Green glands
Question 8 · difficulty L3 · application
An animal converts toxic ammonia into a less toxic compound before excretion and can therefore use less water than an ammonotelic animal. Which waste is most likely produced?
- A. Carbon dioxide
- B. Ammonia
- C. Urea
- D. Molecular nitrogen
Question 9 · difficulty L3 · application
Which pairing of animal group and excretory structure is correct?
- A. Crustaceans — kidneys identical to mammals
- B. Earthworms — flame cells
- C. Flatworms — nephridia
- D. Insects — Malpighian tubules
Question 10 · difficulty L4 · analysis
Animal P releases highly toxic nitrogenous waste directly into abundant surrounding water, whereas animal Q converts nitrogen to a poorly soluble paste. Which excretory strategies are P and Q using?
- A. Ammonotelism and uricotelism
- B. Ureotelism and ammonotelism
- C. Uricotelism and ureotelism
- D. Both are ammonotelic

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