Class 10 Excretion|Life processes Important questions

In this page we have Important Questions for Class 10 Life processes Excretion . Hope you like them and do not forget to like , social shar and comment at the end of the page.

Question 1
How are wastes formed in the body?
Wastes are formed in the body as by- products of the metabolic activities in the body.

Question 2
Define excretion.
The removal of harmful and unwanted toxic waste products of metabolism from the body is known as excretion.

Question 3
Define osmoregulation.
The process by which the water content and the ion concentration is regulated and kept constant in the cells is known as osmoregulation.

Question 4
Name an organ that performs both excretion and osmoregulation.
Kidney perform both excretion and osmoregulation.

Question 5
What is secretion? Give two examples.

Secretion is the production of useful chemical substances like hormones, enzymes or other molecules by glands, endocrine glands or specialized cells. For example: The liver secretes bile, the islets of Langerhans secrete insulin, epithelial lining of the large intestine secrete mucus.

Question 6
What is egestion?
The expelling of undigested wastes from the body in the form of excreta is known as egestion.

Question 7
What are the three main groups of excretory wastes found in animals?
The three main groups are


Respiratory wastes


Nitrogenous wastes


Bile pigments

Question 8
Name the two respiratory waste products formed due to catabolism of food?
The two respiratory waste products formed due to catabolism of food are carbon dioxide and water.

Question 9
ention four nitrogenous waste produced by animals?
Answer: Four nitrogenous waste products produced by animals are:




Uric acid




Amino acid

Question 10
In higher animals, what does ammonia react with to produce urea?
Ammonia reacts with carbon dioxide in the liver tp form a less toxic substance, urea which is periodically flushed out of the system.

Question 11
Name two groups of animals in which amino acids are excreted out without undergoing any change?
Amino acids are excreted out without undergoing any change in:
  1. Mollusks
  2. Echinoderms

Question 12
Name two groups of animals which excrete uric acid in the form of a white paste or pellet?
Animals which excrete uric acid in the form of a white paste or pellet are:
  1. Birds
  2. Reptiles

Question 13
Name the organ that converts ammonia into urea in higher animals?
Ammonia is converted into urea in the liver.

Question 14
How are bile pigments formed?
Bile pigments are formed by the breaking down of hemoglobin present in the red blood cells.

Question 15
Name the organ that destroys worn out red blood cells.
Worn out red blood cells are destroyed in the liver.

Question 16
Name two bile pigments?
The two bile pigments are:
  1. Bilirubin
  2. Biliverdin

Question 17
Name the organelle in amoeba that performs excretion and osmoregulation.
Contractile vacuole in amoeba performs excretion and osmoregulation.

Question 18
What would happen to amoeba if osmoregulation did not take place?
If osmoregulation did not take place the organism would get flooded with water and burst.

Question 19
How does the cell membrane perform excretion in amoeba?
The cell membrane of Amoeba being semi permeable the carbon dioxide diffuses out of the cell membrane into the surrounding water. The cell membrane forms the general body surface of amoeba.

Question 20
Name two waste products excreted by the skin?

Two waste products excreted by the skin are:
  1. Sweat
  2. Sebum

Question 21
ention one difference between sebum and sweat?
Sebum is secreted by the sebaceous gland. Sweat is secreted by the sweat gland.

Question 22
Where are sebaceous glands found?
Sebaceous glands are found attached to the hair follicle in the skin of mammals.

Question 23
ention three excretory substances found in sebum?
Three excretory substances found in sebum are:
  1. Wax
  2. Fatty acid
  3. Sterols

Question 24
Name the principal excretory organ in man. What does it excrete?
The main excretory organ in man are the kidney. They excrete urine.

Question 25
Why is the right kidney lower than the left?
The right kidney is lower than the left because of the presence of liver, in the abdominal cavity.

Question 26
Name three beverages that are diuretics?
Three beverages that are diuretics are:
  1. Coffee
  2. Tea
  3. Alcohol

Question 27
Differentiate between afferent arteriole and efferent arteriole.

Afferent Arteriole

Efferent Arteriole

Formed by the branching of the renal artery

Formed by the joining of the glomerular capillaries

Its lumen is twice as thick as the efferent arteriole

Its lumen is twice as narrow as that of the afferent arteriole Carries

Brings oxygenated blood into the kidney

Oxygenated blood away from the Bowman’s capsule

Brings blood which contains large amounts of water and nitrogenous metabolic wastes

It carries away blood that is relatively thicker and free of toxic wastes

Divides to form the glomerulus which is a knot inside the Bowman’s capsule

Divides to form the vasa rectae enveloping the renal tubule

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Practice Question

Question 1 Which among the following is not a base?
B) $NH_4OH$
C) $C_2H_5OH$
Question 2 What is the minimum resistance which can be made using five resistors each of 1/2 Ohm?
A) 1/10 Ohm
B) 1/25 ohm
C) 10 ohm
D) 2 ohm
Question 3 Which of the following statement is incorrect? ?
A) For every hormone there is a gene
B) For production of every enzyme there is a gene
C) For every molecule of fat there is a gene
D) For every protein there is a gene

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