NCERT Solutions | Class 7 Science Chapter 10 | Respiration in Organisms

CBSE Solutions | Science Class 7

Check the below NCERT Solutions for Class 7 Science Chapter 10 Respiration in Organisms Pdf free download. NCERT Solutions Class 7 Science were prepared based on the latest exam pattern. We have Provided Respiration in Organisms Class 7 Science NCERT Solutions to help students understand the concept very well.

NCERT | Class 7 Science

NCERT Solutions Class 7 Science
Book:	National Council of Educational Research and Training (NCERT)
Board:	Central Board of Secondary Education (CBSE)
Class:	7th
Subject:	Science
Chapter:	10
Chapters Name:	Respiration in Organisms
Medium:	English

Respiration in Organisms | Class 7 Science | NCERT Books Solutions

You can refer to MCQ Questions for Class 7 Science Chapter 10 Respiration in Organisms to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

NCERT Science book Class 7 Solutions PDF free download, Question 1.

Why does an athlete breathe faster and deeper than usual after finishing the race?

cbse science class 7 solutions, Answer :

During running, the athlete uses a lot of energy. So, he/she needs more energy and breathes faster.

ncert science class 7 book, Question 2.

List the similarities and differences between aerobic and anaerobic respiration.

ncert class 7 science Chapter 10 question answer, Answer :

Similarities:

Aerobic Respiration	Anaerobic Respiration
1. It starts with the breakdown of a nutrient (glucose).	1. It also starts with the breakdown of a nutrient (glucose).
2. It yields byproducts.	2. It also yields byproducts.
3. It takes place in a cell.	3. It also takes place in a cell.
4. In this process energy is released.	4. In this process also energy is released.

Differences:

Aerobic Respiration	Anaerobic Respiration
1. It is the process of breakdown of glucose in the presence of oxygen.	1. It is the process of breakdown of glucose in the absence of oxygen.
2. Glucose is completely oxidized.	2. Glucose is incompletely oxidized.
3. The end products formed are CO₂, H₂O, and energy.	3. The end products formed are C0₂, ethyl alcohol (organic acid), and energy.
4. Energy released is more. (38 ATP molecules).	4. Energy released is less (2 ATP molecules).
5. It takes place in all higher organisms.	5. It takes place in lower organisms like yeast and the muscles of man.
6. The reactions take place in the cytoplasm and mitochondria.	6. The reactions take place only in the cytoplasm.

ncert science class 7 Chapter 10, Question 3.

Why do we often sneeze when we inhale a lot of dust-laden air?

cbse science class 7 solutions, Answer :

The air around us has various types of unwanted particles, such as smoke, dust, pollens, etc. When we inhale, the particles get trapped in the hair present in our nasal cavity. However, sometimes these particles may get past the hair in thç nasal cavity. Then they irritate the lining of the cavity, as a result of which we sneeze. Sneezing expels these foreign particles from the inhaled air and dust-free, clean air enters our body.

ncert science class 7 pdf free download, Question 4.

Take three test-tubes. Fill 3/4th of each with water. Label them A, B and C. Keep a snail in test-tube A, a water plant in test-tube B, and in C keep snail and plant both. Which test-tube would have the highest concentration of CO₂?

ncert class 7 science Chapter 10 question answer, Answer :

The exchange of gases in three test-tubes can be shown as in Fig.
NCERT Solutions for Class 7 Science Chapter 10 Respiration in Organisms Q.4

Fig. (A) In test tube A; CO₂ is produced by the respiration of snail (No consumption of CO₂).
(B) In test tube B; CO₂ is produced by the respiration of the plant and a much higher amount of CO₂ is consumed during photosynthesis.
(C) In test tube C; CO₂ is produced by the respiration of snail and plant and CO₂ is consumed during photosynthesis.
It is clear from the above observation that the highest concentration of CO₂ will be in test tube A.

ncert science class 7 solutions, Question 5.

Tick the correct answer:
(a) In cockroaches, air enters the body through
(i) lungs
(ii) gills
(iii) spiracles
(iv) skin

(b) During heavy exercise, we get cramps in the legs due to the accumulation of
(i) carbon dioxide
(ii) lactic acid
(iii) alcohol
(iv) water

(c) Normal range of breathing rate per minute in an average adult person at rest is:
(i) 9-12
(ii) 15-18
(iii) 21-24
(iv) 30-33

(d) During exhalation, the ribs
(i) move outwards
(ii) move downwards
(iii) move upwards
(iv) do not move at all

cbse science class 7 solutions, Answer :

(a) (iii) spiracles
(b) (ii) lactic acid
(c) (ii) 15 – 18
(d) (ii) move downwards

ncert science class 7 textbook pdf, Question 6.

Match the items in Column I with those in Column II :

Column I	Column II
(a) Yeast	(i) Earthworm
(b) Diaphragm	(ii) Gills
(c) Skin	(iii) Alcohol
(d) Leaves	(iv) Chest cavity
(e) Fish	(v) Stomata
(f) Frog	(vi) Lungs and skin
	(vii) Tracheae

ncert class 7 science Chapter 10 question answer, Answer :

Column I	Column II
(a) Yeast	(iii) Alcohol
(b) Diaphragm	(iv) Chest cavity
(c) Skin	(i) Earthworm
(d) Leaves	(v) Stomata
(e) Fish	(ii) Gills
(f) Frog	(vi) Lungs and skin

NCERT Solutions for Class 7 Science, Question 7.

Mark ‘T’ if the statement is true and ‘F’ if it is false :
During heavy exercise, the breathing rate of a person slows down. (T/F)
Plants carry out photosynthesis only during the day and respiration only at night. (T/F)
Frogs breathe through their skins as well as their lungs. (T/F)
The fishes have lungs for respiration. (T/F)
The size of the chest cavity increases during inhalation. (T/F)

cbse science class 7 solutions, Answer :

(i) F
(ii) F
(iii) T
(iv) F
(v) T

NCERT Solutions for Class 7 Science Chapter 10, Question 8.

Given below is a square of letters in which are hidden different words related to respiration in organisms. These words may be present in any direction—upwards, downwards, or along the diagonals. Find the words for your respiratory system. Clues about those words are given below the square.
byjus class 7 science Chapter 10 Respiration in Organisms Q.8.1

byjus class 7 science Chapter 10 Respiration in Organisms Q.8.1

(i) The air tubes of insects
(ii) Skeletal structures surrounding the chest cavity
(iii) Muscular floor of the chest cavity
(iv) Tiny pores on the surface of the leaf
(v) Small openings on the sides of the body of an insect
(vi) The respiratory organs of human beings
(vii) The openings through which we inhale
(viii) An anaerobic organism
(ix) An organism with a tracheal system

ncert class 7 science Chapter 10 question answer, Answer :

(i) TRACHEA
(ii) RIBS
(iii) DIAPHRAGM
(iv) STOMATA
(v) SPIRACLES
(vi) LUNGS
(vii) NOSTRILS
(viii) YEAST
(ix) ANT
These names are indicated by arrows and their serial number are indicated at starting point of the arrow.
NCERT Solutions for Class 7 Science Chapter 10 Respiration in Organisms Q.8.2

NCERT Solutions for Class 7 Science Chapter 10 Respiration in Organisms Q.8.2

science class 7 Chapter 10, Question 9.

The mountaineers carry oxygen with them because:
(a) at an altitude of more than 5 km, there is no air.
(b) the amount of air available to a person is less than that available on the ground.
(c) the temperature of the air is higher than that on the ground.
(d) the pressure of air is higher than that on the ground.

cbse science class 7 solutions, Answer :

(b) The amount of air available to a person is less than that available on the ground.