Excretory Products and their Elimination Test

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Excretory Products and their Elimination Test - 2

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Weekly Quiz Competition

Question 1
4 / -1

The characteristic(s) common to urea, uric acid and ammonia ia/are
(i) They are nitrogenous wastes.
(ii) They all need very large amout of water for excretion
(iii) They are all eually toxic.
(iv) They are produced in the kidneys.

A
(i), (iii) and (iv)

B
(i) only

C
(i) and (iii)

D
(i) and (iv)

Solution

Urea, uric acid and ammonia are known as nitrogenous wastes as they are produced during protein metabolism. Ammonia needs very large amount of water for excretion, second in order comes urea and then uric acid. Ammonia is highly toxic, then comes urea and then uric acid. Ammonia and urea are produced in the liver and uric acid is formed mostly in the liver and to some extent in kidneys.
Question 2
4 / -1

Which one of the following options gives the correct categorization of animals according to the type of nitrogenous waste they give out?

A
a

B
b

C
c

D
d

Solution

Aquatic animals are ammonotelic as they excrete ammonia. Frog, amphibians and humans are ureotelic as they excrete urea. Pigeon, lizards and cockroach are uricotelic as they excrete uric acid.
Question 3
4 / -1

Which of the following statements is incorrect?

A
In ureotelic organisms, ammonia is not a product of metabolism.

B
In mammals, some amount of urea may be retained in the kidney matrix to maintain osmolarity.

C
In fish, kidneys do not play any significant role in the removal of ammonium ions.

D
Urea and uric acid are less toxic than ammonia.

Solution

In reotelic organisms, ammonia is produced by metabolism which then gets converted into urea. This urea is then excreted out by the kidneys and thus these animals are ureotelic.
Question 4
4 / -1

Which of the following pairs of organism are uricotelic?

A
Cartilaginous fish and mammals

B
Reptiles and mammals

C
Birds and insects

D
Bony fish and lizards

Solution

Birds and insects excrete nitrogenous wastes as uric acid in the form of a pellet or paste with a minimum loss of water and are thus called uricotelic animals.
Question 5
4 / -1

Which of the following groups contains uricotelic animals only?

A
Reptiles, birds, land snails, inserts

B
Reptiles, birds, land snails, aquatic insert

C
Amphibians, birds, land snails, insects

D
Amphibians, reptiles, birds, insects

Solution

Reptiles, birds land snails and insects excrete nitrogenous wastes as uric acid in the form of white paste and thus they are called uricotelic animals.
Question 6
4 / -1

The principal nitrogenous excretory compound in humans is synthesized

A
in kidneys but eliminated mostly through liver

B
as well as eliminated by kidneys

C
in liver and also eliminated by the same through bile

D
in the liver, but eliminated mostly through kidney

Solution

The principal nitrogenous excretory compound is humans is ammonia which is converted into such lies toxic urea in the liver but this urea is eliminated by the kidneys via urine.
Question 7
4 / -1

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

A
Ammonia is easily soluble in water.

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

C
Ammonia is highly toxic and need to be eliminated when formed.

D
Both (a) and (b).

Solution

Ammonia is the end product of protein metabolism. Ammonia diffuses through the cell membrane extremely fast because of its high water solubility and small molecular size.
Question 8
4 / -1

Which one of the following options shows a correct matching pair?

A
Man - Ureotelic

B
Bird - Ammonotelic

C
Fish - Uricotelic

D
Frog - Uricotelic

Solution

Humans are ureotelic i.e., they excrete urea. Birds are uricotelic, bony fishes are ammonotelic, cartilaginous fishes and frogs are ureotelic.
Question 9
4 / -1

Which of the following is the most toxic excretory product?

A
CO₂

B
Ammonia

C
Urea

D
Amino acids

Solution

Ammonia is the primary excretory material of many aquatic freshwater forms. It is most toxic waste material which requires large amount of water for its excretion.
Question 10
4 / -1

Select the correct option representing the excretory organs present in (i) earth worm, (ii) centipede, (iii) prawn, and (iv) flatworm.

A
(i) Malpighian tubules (ii) Flame cell (iii) Nelphridia (iv) Green gland

B
(i) Flame cell (ii) Green gland (iii) Malpighian tubules (iv) Nephridia

C
(i) Nephridia (ii) Malpighian tubules (iii) Green gland (iv) Flame cell

D
(i) Green gland (ii) Nephridia (iii) Flame cell (iv) Malpighian tubules
Solution
In earthworms, carbon dioxide and nitrogenous wastes are the main waste materials. The carbon dioxide is excreted out from the body through its moist skin by the process of diffusion. The nitrogenous wastes are excreted out of the body by special excretory organs called nephridia.
In centipede, the excretory system consists of a pair of Malpighian tubules that run from the midgut to the hindgut. Waste exits the body through the anus at the posterior end.
Excretory organs of prawns are known as green glands or antennal glands. They are called green glands for their colour and antennal gland for the location at the base of the second antennae.
Invertebrates such as flatworms use a nephridium as their excretory organ. At the end of each blind tubule of the nephridium is a ciliated flame cell. As the fluid passes down the tubule, solutes are reabsorbed and returned to the body fluids.
So, the correct option is '(i) Nephridia (ii) Malpighian tubules (iii) Green gland (iv) Flame cell'.

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Excretory Products and their Elimination Test - 2

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Excretory Products and their Elimination Test - 2

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SHARING IS CARING

Question 1

(i), (iii) and (iv)

(i) only

(i) and (iii)

(i) and (iv)

Solution

Question 2

a

b

c

d

Solution

Question 3

In ureotelic organisms, ammonia is not a product of metabolism.

In mammals, some amount of urea may be retained in the kidney matrix to maintain osmolarity.

In fish, kidneys do not play any significant role in the removal of ammonium ions.

Urea and uric acid are less toxic than ammonia.

Solution

Question 4

Cartilaginous fish and mammals

Reptiles and mammals

Birds and insects

Bony fish and lizards

Solution

Question 5

Reptiles, birds, land snails, inserts

Reptiles, birds, land snails, aquatic insert

Amphibians, birds, land snails, insects

Amphibians, reptiles, birds, insects

Solution

Question 6

in kidneys but eliminated mostly through liver

as well as eliminated by kidneys

in liver and also eliminated by the same through bile

in the liver, but eliminated mostly through kidney

Solution

Question 7

Ammonia is easily soluble in water.

Ammonia is released from the body in a gaseous state.

Ammonia is highly toxic and need to be eliminated when formed.

Both (a) and (b).

Solution

Question 8

Man - Ureotelic

Bird - Ammonotelic

Fish - Uricotelic

Frog - Uricotelic

Solution

Question 9

CO2

Ammonia

Urea

Amino acids

Solution

Question 10

(i) Malpighian tubules (ii) Flame cell (iii) Nelphridia (iv) Green gland

(i) Flame cell (ii) Green gland (iii) Malpighian tubules (iv) Nephridia

(i) Nephridia (ii) Malpighian tubules (iii) Green gland (iv) Flame cell

(i) Green gland (ii) Nephridia (iii) Flame cell (iv) Malpighian tubules

Solution

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