Question 1

Kidney crystals are solid clusters of:

Accepted Answer

Correct answer is B

Question 2

Waste products of adenine and guanine (Purines) metabolism are excreted by man as:

Accepted Answer

Main sources of uric acid are purines. Purines like adenine and Guanine change into xanthine which changes into uric acidGuanineAdenine → xanthine → uric acidNitrogenous waste substances such as Ammonia, urea, or uric acid are produced during protein metabolism according to the species. Small amount of nitrogenous waste substance are also produced during the metabolism of nucleic acids. Ammonia is the most toxic followed by urea and uric acid the latter is the least toxic.

Question 3

Uricotelism is a method of conserving:

Accepted Answer

Excretion of uric acid is of greater advantage to land animals which have limited access to water. So uricotelism is an adaptation to terrestrial mode of life. Uric acid is expelled in solid state

Question 4

In man, the urea is mainly produced in:

Accepted Answer

Ornithine cycle is a cyclic process of urea formation which operates in the mitochondria of liver cells and has been studied by kreb's and Henseleit.

Question 5

A man takes large amount of protein. He is likely to excrete more amount of:

Accepted Answer

Because they are the ultimate products of protein catabolism.

Question 6

Which one of the following blood vessels in mammals would normally carry the largest amount of urea?

Accepted Answer

Since urea formation takes place in liver.

Question 7

Which one of the following is likely to accumulate in a dangerous proportion in the blood of a person whose kidney is not working properly?

Accepted Answer

Because kidney removes urea.

Question 8

The glomerular filtrate consists of:

Accepted Answer

Correct answer is D

Question 9

The body cells in cockroach discharge their nitrogenous waste in the haemolymph mainly in the form of:

Accepted Answer

Correct answer is A

Question 10

The characteristic that is shared by urea, uric acid and ammonia is/are:(A) They are nitrogenous wastes(B) They all need very large amount of water for excretion(C) They are all equally toxic(D) They are produced in the kidneys

Accepted Answer

Correct answer is D

Question 11

Which one of the following characteristics is common both in humans and adult frogs?

Accepted Answer

Adult frog and human exhibit ureotelism because there excretory waste product is urea.

Question 12

Uric acid is the chief nitrogenous component of the excretory products of:

Accepted Answer

Correct answer is C

Question 13

Which of the following nitrogenous substance is highly toxic?

Accepted Answer

The ammonia is highly toxic because it has high pH , So, it must either be metabolised or expelled immediately out of body, so its concentration remains low in the blood.

Question 14

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

Accepted Answer

Correct answer is B

Question 15

The urine is:

Accepted Answer

Correct answer is B

Question 16

Aquatic reptiles are:

Accepted Answer

Aquatic animals excrete ammonia and reptiles excrete uric acid. Based on the form in which nitrogenous waste is dispelled from the body, the organisms are categorized as under three categories: Ammonotelic, Uricotelic, and Ureotelic.Aquatic reptiles are ureotelic. The ureotelic animals are those animals that excrete urea. These include amphibians, mammals, aquatic or semi-aquatic reptiles like turtles and alligators.

Question 17

Which of the following is the nitrogenous waste?

Accepted Answer

Correct answer is D

Question 18

Choose the wrong statement.

Accepted Answer

In ureotelic animals, ammonia is produced as a product of metabolism, but this ammonia is converted to urea by ornithine cycle in the liver. In this cycle two molecules of Ammonia and one molecule of carbon dioxide and 3 ATP are used in urea formation.

Question 19

Which of the following are uricotelic animals?

Accepted Answer

The animals which excrete mainly uric acid are uricotelic. Terrestrial reptiles (lizards and snakes), birds, most insects are uricotelic animals.

Question 20

Marine teleosts, undergoing putrefaction, emit sharp characteristic foul odour, which is due to the production of?

Accepted Answer

Marine teleosts form trimethylamine from their ammonia by methylation process which produce foul smell on oxidation.

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Solutions for Excretory Products and their Elimination Important Questions

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