NCERT Solutions Class 7 Science Chapter 10 Respiration in Organisms – Here are all the NCERT solutions for Class 7 Science Chapter 10. This solution contains questions, answers, images, explanations of the complete chapter 10 titled Respiration in Organisms of Science taught in class 7. If you are a student of class 7 who is using NCERT Textbook to study Science, then you must come across chapter 10 Respiration in Organisms. After you have studied lesson, you must be looking for answers of its questions. Here you can get complete NCERT Solutions for Class 7 Science Chapter 10 Respiration in Organisms in one place.
NCERT Solutions Class 7 Science Chapter 10 Respiration In Organisms
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For a better understanding of this chapter, you should also see summary of Chapter 10 Respiration In Organisms , Science, Class 7.
| Class | 7 |
| Subject | Science |
| Book | Science |
| Chapter Number | 10 |
| Chapter Name |
Respiration In Organisms |
NCERT Solutions Class 7 Science chapter 10 Respiration In Organisms
Class 7, Science chapter 10, Respiration In Organisms solutions are given below in PDF format. You can view them online or download PDF file for future use.
Respiration In Organisms
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Question & Answer
Q.1: Why does an athlete breathe faster and deeper than usual after finishing the race?
Ans : An athlete needs to supply extra energy to his muscle cells which have worked hard during running. For this, he breathes faster and deeper so that more oxygen is supplied to the cells. This speeds up the breakdown of food and as a result, more energy is released.
Q.2: List the similarities and differences between aerobic and anaerobic respiration.
Ans : Similarity between aerobic and anaerobic respiration: In both aerobic and anaerobic respiration, the food is broken down to release energy. Differences between aerobic and anaerobic respiration:
Q.3: Why do we often sneeze when we inhale a lot of dust-laden air?
Ans : Sneezing expels the foreign particles from the inhaled air, so that only clean air enters our body. It usually occurs because of the irritation in the upper breathing passage. This irritation happens when we inhale some unwanted particles and they get trapped in our nasal cavity. Smoke, dust, pollen, etc. are some of the unwanted particles that may cause sneezing.
Q.4: Take three test-tubes. Fill 314th 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 \(\mathrm{CO}_{2}\)?
Ans :Test tube A will have the highest concentration of \(\mathrm{CO}_{2}\). This is because test tube A contains snail. Snail is an organism that breathes in \(\mathrm{O}_{2}\) and breathes out \(\mathrm{CO}_{2}\). Hence, \(\mathrm{CO}_{2}\) concentration increases in test tube A Test tube B contains a water plant, which takes in \(\mathrm{CO}_{2}\) for food synthesis and gives out \(\mathrm{O}_{2}\). Hence, more \(\mathrm{O}_{2}\) concentration is found in test tube B. Test tube C contains both a snail and a plant. The \(\mathrm{CO}_{2}\) produced by the snail is utilized by the plant for its food synthesis and the \(\mathrm{O}_{2}\) released by the plant is utilized by the snail for respiration. Therefore, test tube A has the highest concentration of \(\mathrm{CO}_{2}\).
Q.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
Ans : (a) In cockroaches, air enters the body through (iii) spiracles (b) During heavy exercise, we get cramps in the legs due to the accumulation of (ii) lactic acid (c) Normal range of breathing rate per minute in an average adult person at rest is (ii) 15-18 (d) During exhalation, the ribs (ii) move downwards
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