Types of Excretion

Q.

What are uricotelic animals?

Q.

Which form of nitrogenous waste is most toxic?

Q. Consider the following statements
I. Flame cells are excretory structures in flatworms
II. Green glands are excretory organs in annelids.
III. Columns of Bertin are the conical projections of renal pelvis into renal medulla between the renal pyramids.

Which of the following statements are incorrect?

1. II and III
2. I and III
3. I and II
4. I, II and III

Q. Which of these excretory products is most toxic?

1. Urea
2. Ammonia
3. Uric acid
4. None of the above

Q.

Why are nitrogenous wastes toxic to humans?

Q.

Define uricotelism. Give example.

Q. Choose the correct statement regarding the elimination of the nitrogenous wastes:

1. Uric acid requires ample water for its excretion
2. Ammonia excretion is feasible for terrestrial organisms
3. Urea is excreted as a precipitate and doesn’t require water
4. Uric acid is the least toxic out of all other nitrogenous wastes

Q. Match the excretory organ to the correct organism.

1. Earthworm
2. Flatworm
3. Paramecium
4. Cockroach

Q. Match the following elements of urine analysis:

1. Infection
2. Albuminuria
3. Glycosuria
4. Jaundice

Q. Which form of nitrogenous waste is most toxic?

1. Urea
2. Ammonia
3. Uric acid
4. All are non-toxic

Q.

Are turtles ureotelic?

Q.

Ureotelic animals are those that eliminate the nitrogenous waste predominately in the form of –

1. Uric acid

2. Ammonia

3. Amino acid

4. Urea

Q.

Which of the following are uricotelic animals?

1. Rohu and Frog

2. Lizard and Crow

3. Camel and Frog

4. Earthworm and eagle

Q. What is the mode of excretion seen in mammals and sharks?

1. Ammonotelism
2. Uricotelism
3. Guanotelism
4. Ureotelism

Q. Which one of the following gives the correct categorization of six animals according to the type of nitrogenous wastes (A, B, C), they excrete?

1. A
2. B
3. C
4. D

Q. Uricotelism is found in:

1. Fishes and fresh water protozoans
2. Birds, reptiles and insects
3. Frogs and toads
4. Mammals and birds

Q.

Which one is component of ornithine cycle.

1. Ornithine, citrulline and alanine

2. Ornithine, citrulline, and arginine

3. Amino acid are not used

4. Ornithine, citrulline and fumaric acid

Q. Assertion: The urea cycle spans two cellular compartments of the liver cell.
Reason: The beginning steps in the cycle take place in the mitochondrial matrix and the rest of the steps take place in the cytosol.

1. Both the assertion and reason are true and the reason is the correct explanation for the assertion
2. Both the assertion and reason are true but the reason is not the correct explanation for the assertion
3. Assertion is true but the reason is false
4. Reason is true but the assertion is false

Q. Assertion: Aquatic mammals like whales and seals are ureotelic.
Reason: Ureotelic animals require a very large amount of water for the removal of urea as compared to the amount of water ammonotelic animals require for the removal of ammonia.

1. Both the assertion and reason are true and the reason is the correct explanation for the assertion
2. Both the assertion and reason are true but the reason is not the correct explanation for the assertion
3. Assertion is true but the reason is false
4. Reason is true but the assertion is false

Q. Which among the following are uricotelic?

1. Birds and reptiles
2. Birds and mammals
3. Fishes and mammals
4. Aquatic insects and fishes

Q.

Which of the following is the most toxic nitrogenous waste?

1. Carbon dioxide

2. Urea

3. Ammonia

4. Uric acid

Q.

Which of the following is not an excretory product in animals?

1. Uric acid

2. Urea

3. Ammonia

4. Hydrochloric acid

Q. Which of these is a product of the urea cycle?

1. Ammonia
2. Citrulline
3. Aspartate
4. Fumarate

Q. Which of the following organisms are uricotelic?

1. Birds
2. Human being
3. Reptiles
4. Both a and c

Q. Which of these are reactants in urea cycle?
(i) $C{O}_2$
(ii) Aspartic acid
(iii) Arginine
(iv) Ornithine

1. i and ii
2. ii and iii
3. iii and iv
4. i and iv

Q. Which of the following steps are ATP dependent in urea cycle?
I. Combination of ammonia and $C{O}_2$
II. Conversion of ornithine to citrulline
III. Reaction of citrulline with aspartate
IV. Formation of urea

1. I only
2. I, II, III, and IV only
3. I and III only
4. I and IV only

Q. Assertion: In birds and reptiles, main excretory product is the combined form of urine and faeces.
Reason: Birds and reptiles have no separate chamber for excretion of urine and faeces.

1. Both the assertion and reason are true and the reason is the correct explanation for assertion.
2. Both the assertion and reason are true and the reason is not the correct explanation for assertion.
3. Assertion is true but the reason is false.
4. Both the reason and assertion are false.

Q. Chief nitrogenous waste product in frog is

1. ammonia
2. urea
3. uric acid
4. allantoin

Q. Which of the following is/are the connecting link between the urea cycle and TCA/Krebs cycle ?
I. Fumarate
II. Ornithine
III. Aspartate
IV. Citrulline

1. I only
2. I and II only
3. I and III only
4. I, II, III, IV

Q. In comparison to ammonia and urea, uric acid is the least toxic and the least soluble in water.

1. True
2. False