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Class 10 Excretion|Life processes Important questions-5




In this page we have Important Questions for Class 10 Life processes Excretion -5 . 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?

Answer

Wastes are formed in the body as by- products of the metabolic activities in the body.

Question 2

Define excretion.

Answer

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

Question 3

Define osmoregulation.

Answer

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.

Answer

Kidney perform both excretion and osmoregulation.

Question 5

What is secretion? Give two examples.

Answer

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?

Answer

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?

Answer:

The three main groups are

1)

Respiratory wastes

2)

Nitrogenous wastes

3)

Bile pigments


Question 8

Name the two respiratory waste products formed due to catabolism of food?

Answer

The two respiratory waste products formed due to catabolism of food are carbon dioxide and water.

Question 9

Mention four nitrogenous waste produced by animals?

Answer: Four nitrogenous waste products produced by animals are:

1)

Urea

2)

Uric acid

3)

Ammonia

4)

Amino acid


Question 10

In higher animals, what does ammonia react with to produce urea?

Answer

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?

Answer

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?

Answer

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?

Answer

Ammonia is converted into urea in the liver.

Question 14

How are bile pigments formed?

Answer

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.

Answer

Worn out red blood cells are destroyed in the liver.

Question 16

Name two bile pigments?

Answer

The two bile pigments are:
  1. Bilirubin
  2. Biliverdin

Question 17

Name the organelle in amoeba that performs excretion and osmoregulation.

Answer

Contractile vacuole in amoeba performs excretion and osmoregulation.

Question 18

What would happen to amoeba if osmoregulation did not take place?

Answer

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?

Answer

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?

Answer

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

Question 21

Mention one difference between sebum and sweat?

Answer

Sebum is secreted by the sebaceous gland. Sweat is secreted by the sweat gland.

Question 22

Where are sebaceous glands found?

Answer

Sebaceous glands are found attached to the hair follicle in the skin of mammals.


Question 23

Mention three excretory substances found in sebum?

Answer

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?

Answer

The main excretory organ in man are the kidney. They excrete urine.

Question 25

Why is the right kidney lower than the left?

Answer

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?

Answer

Three beverages that are diuretics are:
  1. Coffee
  2. Tea
  3. Alcohol


Question 27

Differentiate between afferent arteriole and efferent arteriole.

Answer

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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