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Excretory Products and their Elimination (Class - XI)

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Epithelium found in PCT of nephrons is

  1. transitional epithelium

  2. squamous epithelium

  3. brush bordered epithelium

  4. ciliated epithelium


Correct Option: C
Explanation:

Brush bordered epithelium is found in PCT.

Uric acid is the end product of

  1. purine metabolism

  2. fat metabolism

  3. protein metabolism

  4. alcohol metabolism


Correct Option: A
Explanation:

 Uric acid is the end product of purine metabolism.

Which of the following organisms is ammonotelic?

  1. Man

  2. Boney fish

  3. Cartilaginous fish

  4. Bird


Correct Option: B
Explanation:

Bony fishes are ammonotelic.

Which is the main gaseous waste product of the human body?

  1. NH3

  2. CO2

  3. H2S

  4. O2


Correct Option: B
Explanation:

CO2 is the most important gaseous waste and is eliminated through the lungs.

In which of the following organisms are malpighian tubules found as excretory organs?

  1. Prawn

  2. Cockroach

  3. Planaria

  4. Earthworm


Correct Option: B
Explanation:

The excretory organs of cockroaches are malpighian tubules.

Which among the following is a nitrogenous waste product in spiders?

  1. Trimethylamine oxide

  2. Guanine

  3. Uric acid

  4. Urea


Correct Option: B
Explanation:

This nitrogenous waste product is found in spiders only.

What is ammonotelism?

  1. Fixing of atmospheric nitrogen by soil bacteria

  2. Elimination of nitrogenous waste in the form of ammonia

  3. Production of ammonia or ammonium compounds in the decomposition of organic matter, especially through the action of bacteria

  4. Elimination of nitrogen in the form of urea


Correct Option: B
Explanation:

The process of excretion of nitrogenous waste in the form of ammonia is called ammonotelism.

What is nephrostome?

  1. The main tubular part of nephridia

  2. The funnel-shaped inner opening of a nephridium that is lined with cilia and allows water and waste to enter from the body cavity

  3. The short and narrow tube where nephridial duct opens

  4. A large number of smaller nephridia


Correct Option: B
Explanation:

Nephrostome is the funnel-shaped inner opening of a nephridium that is lined with cilia and allows water and waste to enter from the body cavity. It is the upper part of nephridia.

Which of the following excretory organs is/are not found in humans?

  1. Lungs

  2. Skin

  3. Kidney

  4. Spleen


Correct Option: D
Explanation:

Spleen is a lymphatic tissue and stores blood. It plays no role in excretion.

Ureotelic excretion is found in

  1. mammals

  2. amphibians

  3. reptiles

  4. Both (1) and (2)

  5. spleen


Correct Option: D
Explanation:

.

What is metanephric kidney?

  1. The functional kidney of vertebrate embryonic period

  2. The functional kidney of fishes, amphibians and petromyzon

  3. The functional kidney of adult reptiles, birds and mammals

  4. The functional kidney of molluscs


Correct Option: C
Explanation:

Metanephric kidney is the functional kidney of adult reptiles, birds and mammals.

In which group of animals does trimethylamine oxide occur as a waste product?

  1. Spiders

  2. Teleost fishes

  3. Cockroaches

  4. Human beings


Correct Option: B
Explanation:

In marine teleost fishes, trimethylamine oxide occurs as a waste product in large quantities.

Excretory products of mammalian embryo are eliminated by _____.

  1. placenta

  2. amniotic sac

  3. allantois

  4. uterus


Correct Option: A
Explanation:

Excretory products of mammalian embryo are eliminated by placenta.

Which of the following organs excrete(s) vitamins, bile pigments, drugs, cholesterol and also help(s) in detoxification of nitrogenous waste?

  1. Lungs

  2. Liver

  3. Kidneys

  4. Intestine


Correct Option: B
Explanation:

Liver excretes vitamins, bile pigments, drugs and cholesterol.

Kidney is involved in the excretion of

  1. urea, extra salts and excess water

  2. extra urea, salts and extra water

  3. extra urea, extra water and extra amino acids

  4. extra urea, extra salts and carbohydrates


Correct Option: A
Explanation:

Kidney is involved in the excretion of urea, extra salts and excess water.

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