Types of Excretion

Q. Nitrogenous waste is excreted in the form of pellet or paste by :

Q. Arrange the following forms of nitrogenous wastes in increasing order of toxicity.

1. Ammonia < Urea < Uric acid
2. Urea < Uric acid < Ammonia
3. Uric acid < Urea < Ammonia
4. Ammonia < Uric acid < Urea

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.

What Is micturition?

Q.

Which one of the following statements is incorrect?
(a) Birds and lands snails are uricotelic animals
(b) Mammals and frogs are ureotelic animals
(c) Aquatic amphibians and aquatic insects are ammonotelic animals
(d) Birds and reptiles are ureotelic

Q.

Which of the following pairs is wrong?
(a) Uricotelic ..... Birds (b) Ureotelic..... Insects
(c) Ammonotelic ....tadpole (d) Ureotelic ...... Elephant

Q.

Aquatic animals generally are ammonotelic in nature where as terrestrial forms are not. Comment.

Q.

What exactly are exogenous substances?

Q.

Terrestrial animals are generally either ureotelic or uricotelic, not ammonotelic, why?

Q.

What is the meaning of this sentence:-glucose, amino acids, lipids are present in the plasma as they are always transit in the body

Q.

What is the excretory product from kidneys of reptiles?

Q.

Almost all aquatic animals excrete ammonia as the nitrogenous waste product. Which of the following statements is not in agreement with this situation?

1. Ammonia is released from the body in a gaseous state.

2. Ammonia is highly toxic and needs to be eliminated as and when formed.

3. Ammonia is easily soluble in water.
   

4. All statements are true for the situation.
   

Q.

The function of the mammalian kidney is to excrete

1. extra salts, urea and excess water

2. extra urea, excess water and excess amino acids

3. extra urea, extra carbohydrates and extra water

4. extra urea, extra salts and extra sugar

Q.

Which is least toxic nitrogenous waste?

Q. Uricotelic mode of passing out nitrogenous wastes is found in

1. birds and annelids
2. amphibians and reptiles
3. insects and amphibians
4. reptiles and birds

Q.

Are Metal Carbonates Soluble In Water?

Q. What are the products of urea cycle ?

1. 1 molecule of urea, 2 molecules of ATP, 1 molecule of both AMP and fumaric acid.
2. 1 molecule of urea, 2 molecules of ADP, 1 molecule of both AMP and fumaric acid.
3. 2 molecules of urea, 2 molecules of ammonia, 1 molecule of both ATP and fumaric acid.
4. 1 molecule of aspartate, 2 molecules of ADP, 1 molecule of fumaric acid.

Q. Mark the right statement:

1. Ammonia, guanine and uric acid are soluble in water.
2. Ammonia and urea are soluble in water.
3. Urea, uric acid and ammonia are insoluble in water.
4. Uric acid and urea are soluble in water.

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

1. ureoletic animals
2. ammonotelic animals

Q.

How have the terrestrial organisms adapted themselves for conservation of water?

Q. Heart filters blood in 1 minute and kidney filters in 5 minutes. does all blood filtered by heart filtered by kidney?

Q. Chief nitrogenous waste product in frog is

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

Q.

Ammonia or Urea: Which is more toxic?

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.

What level of ammonia is toxic to fish?

Q. Urea cycle takes place in

1. muscle cell
2. liver cell
3. kidney
4. heart

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 of the following statement/statements are not true according to urea cycle?
I. Two ATP molecules are required for synthesis of carbamoyl phosphate.
II. Products of urea cycle are: 1 molecule of urea, 2 molecules of ADP, 1 molecule each of AMP and fumaric acid.
III. Urea cycle takes place in kidney cells.
IV. Reaction of citrulline and aspartate requires ATP.

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

Q. Waste product of adenine and guanine metabolism are excreted by man as

1. Allantoin
2. Urea
3. Ammonia
4. Uric acid

Q. Which of the following is the most toxic waste matter and requires lots of water to be flushed out of the body?

1. Urea
2. Uric acid
3. Hippuric acid
4. Ammonia