RBSE Solutions for Class 7 Science Chapter 9 Respiration and Excretion in Animals

RBSE Solutions for Class 7 Science Chapter 9 Respiration and Excretion in Animals are part of RBSE Solutions for Class 7 Science. Here we have given Rajasthan Board RBSE Class 7 Science Chapter 9 Respiration and Excretion in Animals.

Board RBSE
Textbook SIERT, Rajasthan
Class Class 7
Subject Science
Chapter Chapter 9
Chapter Name Respiration and Excretion in Animals
Number of Questions Solved 41
Category RBSE Solutions

Rajasthan Board RBSE Class 7 Science Chapter 9 Respiration and Excretion in Animals

Textbook Exercise

Multiple Choice Questions

Choose the correct option
Question 1.
Which organ is helpful in utilisation of oxygen dissolved in water
(a) dome
(b) stomata
(c) mouth
(d) Nostrils
Answer:
(a) dome

Question 2.
Respiratory organs in insect is
(a) Skin
(b) Clome
(c) Lungs
(d) Nostrils
Answer:
(d) Nostrils

Question 3.
Which organism respire through skin
(a) Human
(b) Fish
(c) Cockroach
(d) earthworm
Answer:
(d) earthworm

Fill in the blanks
1. The process of removal of wastes produced from the body is called …………..
2. During inhalation, the ribs moves towards ……….. and diaphram moves toward ……….
3. Insects have a network of air tubes calleds …………
Answer:
1. Excretion
2. outwards, down
3. Trachel tubes

Short Answer Types Questions
Question 1.
How fishes respire in water?
Answer:
Fishes have gills or clome which helps in absorbing oxygen dissolved in water.

Question 2.
How respiration in insects takes place?
Answer:
In insects, there is small openings on the sides of their body. These openings are called spiracles. Insects have a network of air tubes called tracheal tubes for gas exchange

Question 3.
What happened if our kidneys stop working?
Answer:
Kidneys help to remove unwanted substances out of the body, for example, urea. If kidneys stop working the amount of excretory products increases in our body and it becomes very difficult for us to survive.

Long Answer Type Questions
Question 1.
Describe a respiratory system with a well defined digram.
Answer:
The main respiratory organ in our body is a pair of lungs. Nasal cavity, Nostrils, wind pipe or trachea and lungs form respiratory system. Each lung is a brown colour muscular structure.Two lungs are present in chest cavity of our body. This cavity is surrounded by ribs on the sides. A large muscular sheet called diaphragm forms the floor of chest cavity. Many bronchi and bronchioles are present in each lung. From lungs they form single respiratory tube which passes through trachea and reaches nasal cavity. Nasal cavity opens to outside by two nostrils.
RBSE Solutions for Class 7 Science Chapter 9 Respiration and Excretion in Animals 1
Question 2.
Draw a well labeled diagram of excretory system.
Answer:
RBSE Solutions for Class 7 Science Chapter 9 Respiration and Excretion in Animals 2
Question 3.
Explain the mechanism of diaphragm by an activity.
Answer:
See Activity 1 discussed above.

Intext Questions

Question 1.
What is respiration? (page 83)
Answer:
The process of oxidation of glucose in cells to give water, carbon dioxide and energy is called Respiration.

Question 2.
Do all living beings have lungs? (page 85)
Answer:
No, all living beings do not have lungs.

Question 3.
Do roots of the plants respire? (page 85)
Answer:
Yes, roots of the plants also respire.

Activity

Question 1.
Prepare a model of respiratory system with the help of thermocol.
Answer:
Student prepare a model on the basis of diagram given in long answer No. 1.

Question 2.
Take a measurement of chest of your friends after inhalation and exhalation, note down in the table given below:

S. No. Name of student Friend Measurement of chest
After inhalation

After exhalation

1
2
3
4
5

Answer:

S. No. Name of student Friend Measurement of chest
After inhalation After exhalation
1 Swadesh 70 cm 66 cm
2 Mohan 78 cm 73 cm
3 Vikas 77 cm 74 cm
4 Vimal 75 cm 71 cm
5 Divyansh 74 cm 70 cm

Question 3.
Prepare a model of mechanism of human respiratory system with the help of waste material.
Answer:
Student collect old bottles, balloons, Y – shaped tube, thread, rubber sheet, knife etc. and prepare a model according to experiment No. 1.

Question 4.
Prepare a model of human excretory system with the help of waste material and plaster of paris.
Answer:
Student should do himself.

Question 5.
Count respiration process doing in one minute in students of class.
Answer:
This activity can be performed on one student 3-4 times. Suppose Sudhir Patel respire 15 times in first minute, 17 times in second minute, 15 times in third minute and 17 times in fourth minute. Rate of respiration of Sudhir total respiration test/total time Average = 15 + 17 + 15 + 17/4 = 64/4 = 16 times Similarly respiration rate of other students can be calculated.

Question 6.
Act role play on “Danger of smoking”.
Answer:
Cigarette smoking, beetle smoking, Hukka, tobacco etc.,comes under category of smoking. These can destroy our health by harming our lungs, mouth and neck. Prepare role play on this basis.

Activity – 1: (Page 84)

  • Take a wide plastic bottle.
  • Cut the bottom of the bottle and separate it.
  • Now take a Y shaped glass or a plastic tube.
  • Make a hole in the cap of the bottle and fix the tube as shown in the figure..
  •  Tie a balloon on both the end of the tube.
  • Now take a thin rubber or plastic sheet and tie it with a thread or a rubber band on the open bottom of the bottle.

Question 1.
What happened to balloon when you pulled the rubber sheet downwards?
Answer:
Balloons become swelled.

  • Now push the rubber sheet upwards.

Question 2.
What are the changes observed in balloon?
Answer:
Balloons get back to their original shape, i. e get contracted.
Conclusion: When we pull rubber sheet downward, it increases the volume of bottle.This makes the air to pass through tubes and fill into the balloon. When rubber sheet is moved upwards,volume of bottle decreases due to which air moves out of balloon. Our lungs function in a similar way.
RBSE Solutions for Class 7 Science Chapter 9 Respiration and Excretion in Animals 3

Other Important Questions

Choose the correct answer:
Question 1.
It is produced in respiration process
(a) Carbon dioxide
(b) Water
(c) Energy
(d) All the above
Answer:
(d) All the above

Question 2.
The main respiratory organ of humans is
(a) Lungs
(b) Mouth
(c) Kidneys
(d) Liver.
Answer:
(a) Lungs

Question 3.
In humans, process of inhalation and exhalation takes place by
(a) action of ribs
(b) action of diaphragm
(c) action of ribs and diaphragm
(d) none of these
Answer:
(c) action of ribs and diaphragm

Question 4.
Trachea is found in
(a) humans
(b) fish
(c) earthworm
(d) cockroach
Answer:
(c) earthworm

Question 5.
Urine is formed in
(a) liver
(b) kidney
(c) bladder
(d) urethra
Answer:
(b) kidney

Fill in the banks
1. Our body is made of unlimited small ……….
2. Lungs are protected in ……… cage.
3. Exchange of ………. takes place in wind pipe.
4. ……….. of fish absorbs oxygen dissolved in water.
5. Sweat conies out of body by ………… present in skin.
Answer:
1. Cells
2. Rib
3. Gases
4. dome
5. holes

Very Short Answer Type Questions
Question 1.
Why respiration is important for us?
Answer:
Energy is released from food by respiration which operates many activities of our body.

Question 2.
Where are lungs situated in human body?
Answer:
Chest cavity.

Question 3.
Which gas is inhaled and exhaled in the process of respiration?
Answer:
Oxygen gas is inhaled and carbon dioxide gas is exhaled in the process of respiration.

Question 4.
How does gaseous exchange take place in insects?
Answer:
Gaseous exchange takes place in insects through tracheal tubes.

Question 5.
How respiration takes place in earthworm and leeches ?
Answer:
Earthworms, leeches etc., respire through their moist and slimy skin

Question 6.
How gaseous exchange takes place in plants?
Answer:
Small pores are present on the surface of plants called stomata. These stomata helps in exchange of gases in plants.

Question 7.
Name the excretory products of humans.
Answer:
Sweat, urine and carbon dioxide are excretory products of humans.

Question 8.
From where do roots of plants absorbs oxygen?
Answer:
Plants absorb oxygen from the small air spaces in soil.

Short Answer Type Questions
Question 1.
Explain inhalation and exhalation.
Answer:
Normally, when we inhale air, it passes through our nostrils into nasal cavity. This is known as inhalation. Finally, this oxygen reaches cells of the body. Inthe cells, it decomposes the stored food which produces energy, water and carbon dioxide. The carbon dioxide released is moved out of the body. This process is called exhalation.

Question 2.
How does respiration take place in cockroaches ? Explain.
Answer:
In cockroaches and other insects, there is small opening on the sides of their body. These openings are called spiracles. Insects have a network of air tubes called tracheal tubes for gas exchange. Oxygen rich air rushes through spiracles into the tracheal tube, finally reaches to cells. Similarly, carbon dioxide from the cells goes into the tracheal tubes and from there moves out through spiracles.

Question 3.
How does respiration take place in fishes?
Answer:
Fishes have gills or dome which helps in absorbing oxygen dissolved in water. Gills are found out of the skin. Clome absorbs oxygen dissolved in water. Gills are well supplied with blood vessels. Exchange of gases takes place in these blood vessels.

Long Answer Type Questions
Question 1.
Explain the process of respiration with diagram.
Answer:
In humans, two lungs are present in chest cavity. The volume of lungs increases or decreases with the activity of ribs and diaphragm. During inhalation, ribs move outwards and diaphragm moves down. This movement increases volume of chest cavity and air rushes into the lungs. The lungs get filled with air. During exhalation, ribs move inwards and diaphragm moves up to its initial position. This reduces the volume of cavity and air is pushed out of the lungs.
RBSE Solutions for Class 7 Science Chapter 9 Respiration and Excretion in Animals 4
Question 2.
What is excretion? Explain the process of excretion in humans.
Answer:
We remove undigested food from the body as stool and toxic products as urea and uric acid by urine time to time. Carbon dioxide, sweat, stool and urine are main excretory products of our body. When our body cells perform various types of bio chemical processes, certain waste products are released. These waste products are toxic and hence need to be removed from the body. The process of removal of waste produce in the cells of living organism is called excretion. The organs involved in excretion forms the excretory system. In humans, two kidneys, ureters, bladder and urethra forms the excretory system.

The removal of wastes substances present in the blood takes place in two kidneys. The waste dissolved in blood are removed as urine goes into the urinary bladder through tube like ureters. A muscular tube is attached with ureters. It is called urethra. Urethra opens outside the body through a pore which is called urinary opening. From the urinary bladder urine is passed through urethra and removed out by urinary opening.

Question 3.
” The importance of yoga is increasing in today’s environment” Justify the statement.
Answer:
In today’s environment, we can make our lives healthier and happier by Yoga. In today’s polluted environment Yoga is a mode, which has no adverse effects. Many yoga, postures and the Kapal bhati, Anulom – Vilom and Bhramari Pranyam are cayable to make us free form many diseases. Yoga and Pranayam make mind calm. Shawasan make our high blood pressure normal. Vajrasan helps us in tackle digestive disorders. In today, era of computers, whole day work on computers causes back and neck pain. Tadasan and Shalabhasan give freedom from pain relief medication. Adopting many postures ofYoga in life can stay away us from diseases and can fit our health. Yoga gives the body strength to fight with diseases.

It increases resistance power in body. Yoga is profitable for our physical, mental and spiritual health. It makes our life stress free. Gift of Rishi tradition, Yoga is accepted by all over the world. As a result of which the proposal made by our honourable Prime Minister in UN of celebrating International Day ofYoga on June 21 was passed by 177 countries within a very limited time. On 21 June, 2015 the first International Yoga Day was celebrated all over the world. It is written in the Gita, Yoga itself is a journey through self reach themselves. Let us make a success of life by joining the trip.

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