NCERT Solutions Class 7 Science Chapter 6 Respiration in Organisms

Have you ever wondered why you get out of breath after climbing a flight of stairs? The answer to this lies in an understanding of why we breathe, which leads us to a knowledge of respiration. In class 7 Respiration in Organisms, students will understand how various types of organisms – like animals, plants and humans, take in oxygen and release carbon dioxide, what is energy in respiration and how different forms of life respire. The solutions of the chapter-wise questions present in the NCERT solutions class 7 science chapter 6 are intended to enhance the learning of these topics with proper clarity and sequence. 

Class 7 science chapter 6 exercise covers a wide range of questions from all the topics in the NCERT textbook,  helping students to understand the types of questions that may appear in exams, and enabling them to strengthen their conceptual understanding. Through such solutions, the students are able to enhance their problem solving abilities, understand better concepts of respiration in organisms as well as be well prepared to face their end of term exams. 

Nonetheless, NCERT Solutions for Class 7 Science are accompanied by clear elaborated and well-labeled diagrams which helps make understanding more effective and easy for the students as well as makes the learning process more interesting. They help in breaking down complex ideas and offer students an easy way of understanding various concepts; due to the fact that in most of them there is considerable utilization of illustrations. 

1.0Download Class 7 Science Chapter 6 NCERT Solutions PDF Online

Students Can download NCERT Solutions for Class 7 science chapter 6 pdf and practice it from anywhere anytime

2.0What Will Students Learn in Chapter 6: Respiration in Organisms?

• Understanding respiration as a biochemical process through which organisms convert food into energy.
• Telling the difference between aerobic respiration which needs oxygen and anaerobic respiration which does not require oxygen at all.
• Discussing how different types of living things from human beings, plants and animals perform this process. 
• Learn about composition and workings of the human respiratory system and its subsystems focusing on the diaphragm and alveoli parts in gas exchange process.
• Comprehending as to how energy is evolved in respiration and its uses in growth, reproduction and other metabolic activities.
• Identifying the part of oxygen in aerobic respiration and what happens if there is not enough oxygen for the organisms.
• Exploring the interaction between physical activity and the rate of respiration as well as the requirement of additional energy.
• Explaining how plants respire differently, including the understanding of photosynthesis and how it is related to respiration.

3.0NCERT Questions with Solutions for Class 7 Science Chapter 6 - Detailed Solutions

• 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.
• 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:

• 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.
• Take three test-tube. 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 ${\mathrm{CO}}_2$ ? 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 ${\mathrm{CO}}_2$.
• 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) (iii) spiracles (b) (ii) lactic acid (c) (ii) 15-18 (d) (ii) move downwards
• Match the items in Column-I with those in Column-II.

Ans.

• Mark ' T ' if the statement is true and ' F ' if it is false: (i) During heavy exercise, the breathing rate of a person slows down. (T/F) (ii) Plants carry out photosynthesis only during the day and respiration only at night. (T/F) (iii) Frogs breathe through their skins as well as their lungs. (T/F) (iv) The fishes have lungs for respiration. (T/F) (v) The size of the chest cavity increases during inhalation. (T/F) Ans. (i) False (ii) False (iii) True (iv) False (v) True
• Given below is a square of letters in which different words are hidden 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.

(i) The air tubes of insects (ii) Skeletal structures surrounding chest cavity (iii) Muscular floor of chest cavity (iv) Tiny pores on the surface of 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 tracheal system Ans. (i) Trachea (ii) Ribs (iii) Diaphragm (iv) Stomata (v) Spiracles (vi) Lungs (vii) Nostrils (viii) Yeast (ix) Ant 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 air is higher than that on the ground. (d) The pressure of air is higher than that on the ground. Ans. (b) The amount of air available to a person is less than that available on the ground.