Selina solutions for Concise Biology [English] Class 7 ICSE chapter 5 - Excretion in Humans [Latest edition]

Put a tick mark (✓) against the most appropriate alternative in the following statement :  

The kidneys are made up of tiny tubular units called :

Put a tick mark (✓) against the most appropriate alternative in the following statement : 

 In human beings, urea is produced in :

Put a tick mark (✓) against the most appropriate alternative in the following statement : 

 Besides water, the urine mainly contains :

Put a tick mark (✓) against the most appropriate alternative in the following statement : 

Filtration of excretory wastes from the blood occurs in:

Fill in the blank :

Nitrogenous wastes in the urine are in the form of urea and ..................... 

Fill in the blank : 

The unit of human kidney is called ..................... 

Fill in the blank : 

Evaporation of sweat from the skin surface has ............... effect.

Define the following: 

Excretion 

Define the following: 

Excretory organs  

Define the following: 

Dialysis

Define the following:  

Nephron

Write True (T) or False (F) for the following statement. Rewrite the false statement in the correct form. 

Removal of solid undigested food is excretion 

Write True (T) or False (F) for the following statement. Rewrite the false statement in the correct form. 

Medulla of kidney passes urine into urinary bladder.  

Write True (T) or False (F) for the following statement. Rewrite the false statement in the correct form.   

Excess sugar in the blood is a symptom of diabetes. 

Write True (T) or False (F) for the following statement. Rewrite the false statement in the correct form. 

Urine is devoid of blood cells. 

Name the blood vessel that brings blood to the kidneys. 

Where in the urinary system do the following processes take place?

1. Urine formation: ______.
2. Transport of urine away from kidney: ______.
3. Temporary storage of urine: ______.

Define excretion. Write the four organs of the human urinary system in their correct sequence. 

Why is excretion necessary in living beings?

What is meant by osmoregulation?

Describe the structure of the kidney with the help of a labelled diagram. 

What are the two ways by which a person can get relief in case of kidney failure?

Draw a diagram of the human excretory system and label the following parts: Kidney, ureter, urinary bladder, and urethra. 

How are kidney stones formed? 

What are the symptoms of a urinary tract infection? 

State if the following statement is true or false. Correct the statement if it is false.  

 The organs that help our body to get rid of the waste are called respiratory organs.  

State if the following statement is true or false. Correct the statement if it is false.  

Each kidney contains millions of microscopic filtering units called ureters. 

State if the following statement is true or false. Correct the statement if it is false. 

The Bowman’s capsule and glomerulus together form the Malpighian body. 

State if the following statement is true or false. Correct the statement if it is false.  

Liver produces bile pigments from the hemoglobin of broken RBCs.

Tick the most appropriate answer. 

The process of removing waste from the body is called

Tick the most appropriate answer. 

The opening of the urinary bladder is called

Tick the most appropriate answer. 

A network of capillaries present in the Bowman’s capsule is called 

Tick the most appropriate answer. 

The blood vessel that supplies impure blood to a kidney is the

Tick the most appropriate answer. 

The Bowman’s capsule and glomerulus together form the

Tick the most appropriate answer. 

Quinine is used in the treatment of

Tick the most appropriate answer. 

Plants maintain the concentration of sap inside their body with 

Tick the most appropriate answer.  

Transpiration is affected by

Fill in the blank. 

.................. are a pair of reddish-brown, bean-shaped structures that lie on either side of the backbone.

Fill in the blank. 

Urine contains .................... and ................. as nitrogenous waste.

Fill in the blank. 

.................. carries urine from the kidney to the urinary bladder.

Fill in the blank.  

Malpighian body consists of Bowman’s capsule and ..................... 

Fill in the blank. 

.................. produces bile pigments from the heamoglobin of broken RBCs.

Fill in the blank. 

....................... are present in the stem of pine tree that make the pinewood strong and durable.

Fill in the blank. 

........................ is found in the seeds of poppy plants.

Fill in the blank.  

When air is humid, the rate of transpiration is .................. 

Differentiate between
ureter and urethra.

Differentiate between 

bowman’s capsule and glomerulus.

Differentiate between 

tannins and resins

Differentiate between 

excretion and transpiration

Find the odd one out. Give a reason for your choice.

ureter, kidney, urinary bladder, lung, urethra 

Find the odd one out. Give a reason for your choice.

skin, heart, lung, liver, kidney  

Find the odd one out. Give a reason for your choice.

tannin, urine, latex, resin 

Answer the following in short.

What is excretion? 

Answer the following in short.

What are the main organs involved in the human excretory system? 

Answer the following in short.

What is urethra? 

Answer the following in short.

List five waste products of plants. 

Answer the following in short.

Define transpiration in plants. 

Answer the following in detail.

Draw a labelled diagram of the urinary system in human beings and describe each part. 

Answer the following in detail.

Explain the structure of a nephron with the help of a diagram.

Answer the following in detail.

Describe the process of urine formation. 

Answer the following in detail.

How do skin and lungs help in excretion?

Answer the following in detail.

Explain the process of transpiration. Describe some factors that affect it. 

Answer the following in detail.

Write a short note on artificial kidneys.

Correct the sequence of the following steps to explain the process of urine formation.   

1. Blood enters the glomerulus under high pressure.
2. The filtrate passes through the thin walls of the Bowman’s capsule into the renal tubule
3. As the filtrate, passes through the tubule, water, and many useful substances are reabsorbed by the walls of the blood capillaries.
4. Water and small solutes are filtered in the Bowman’s capsule.
5. The remaining liquid, along with waste is called urine and is collected in the urinary bladder.
6. Blood containing waste material enters the kidneys through the renal artery.

One of Harry’s organs is not functioning properly. There is extra fluid build up in his body causing swelling in his ankles and feet. 

What should Harry do? Tick the correct answer.

Which of Harry’s organs is not working properly? 

One of Harry’s organs is not functioning properly. There is extra fluid build up in his body causing swelling in his ankles and feet. 

What should Harry do? Tick the correct answer. 

He should see a 

One of Harry’s organs is not functioning properly. There is extra fluid build up in his body causing swelling in his ankles and feet. 

What should Harry do? Tick the correct answer. 

Harry most probably needs a