NCERT Solutions for Class 7 Science Chapter 6 Respiration In Organisms 2025-26

1. Why Does an Athlete Breathe Faster and Deeper than Usual After Finishing the Race?

Ans: Running requires a lot of energy, and ATP is produced by the breakdown of glucose, which is a rapid source of energy. As a result, while running, all of the reserve energy is used, and more oxygen is required for the generation of fresh ATP. As a result, following the race, the athlete breathes faster.

2. List the Similarities and Differences Between Aerobic and Anaerobic Respiration.

Ans: Similarities include: 

i. The release of energy.

ii. Carbon dioxide is released into the atmosphere.

Differences: 

i. Anaerobic feeding occurs in the absence of oxygen, whereas aerobic respiration necessitates the presence of oxygen.

ii. In aerobic respiration, glucose is entirely broken down, but in anaerobic respiration, incomplete oxidation occurs.

3. Why Do We Often Sneeze When We Inhale a Lot of Dust-Laden Air?

Ans: When we inhale air, undesired particles such as dust, dirt, pollen, and smoke enter our respiratory system, causing irritation in the nasal cavity. This causes sneeze.

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?

Ans: Test tube-A. 

The maximum concentration of carbon dioxide will be found in test tube A. The snail's respiration produces carbon dioxide (CO2). Snail is an organism that takes in oxygen and exhales carbon dioxide. As a result, the concentration of CO2 in test tube A rises.

5. Tick the Correct Answer: 

i. In Cockroaches, Air Enters the Body Through

i. Lungs

ii. Gills 

iii. Spiracles

iv. Skin

Ans: Spiracles

ii. During Heavy Exercise, We Get Cramps in the Legs Due to the Accumulation Of

i. Carbon Dioxide 

ii. Lactic Acid

iii. Alcohol

iv. Water

Ans: lactic acid

iii. The 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

Ans: 15-18

iv. During Exhalation, the Ribs 

i. Move Outwards 

ii. Move Downwards 

iii. Move Upwards

iv. Do Not Move at All.

Ans: Move downwards

6. Match the Items in Column I with Those in Column II 

Ans : 

7. Mark ‘T’ If the Statement is True and ‘F’ If it is False:

1. During Heavy Exercise, the Breathing Rate of a Person Slows Down.

Ans: False, When we exercise, our bodies move, which necessitates more energy to complete the task and enough oxygen for organs to function properly. Following the exercise, a person requires additional carbon dioxide to expel the carbon dioxide produced during the exercise. 

2. Plants Carry Out Photosynthesis Only During the Day and Respiration Only at Night. 

Ans: False, Plants only photosynthesize during the day when the sun is shining, yet they respire all day and night.

3. Frogs breathe through their skins as well as their lungs.

Ans: True.

4. The Fishes have Lungs for Respiration.

Ans: False, The gills allow the fish to breathe. Fishes are devoid of lungs.

5. The Size of the Chest Cavity Increases During Inhalation.

Ans: True.

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 These Words Are Given Below the Square. 

1. The Air Tubes of Insects. 

2. The Skeletal Structure Surrounding the Chest Cavity. 

3. The Muscular Floor of the Chest Cavity. 

4. Tiny Pores on the Surface of the Leaf. 

5. Small Opening on the Sides of the Body of an Insect. 

6. The Respiratory Organ of Human Beings. 

7. The Opening Through Which We Inhale. 

8. An Anaerobic Organism.

Ans : 

9. the Mountaineers Carry Oxygen With Them Because----------------. 

Ans: The amount of air accessible at that altitude is significantly smaller than on land. Therefore, mountaineers carry oxygen with them. 

NCERT Science Chapter 6 Class 7- Quick Overview of Topics Covered

Science Class 7 Chapter 6 - Important Points

1. Respiration is the process by which organisms take in oxygen and release carbon dioxide to produce energy from food.

2. It provides the energy required for various physiological activities and the maintenance of life.

3. The taking in of air rich in oxygen into the body is called inhalation, and giving out of air rich in carbon dioxide is known as exhalation.

Types of Respiration

• Aerobic Respiration: Occurs in the presence of oxygen, producing more energy along with carbon dioxide and water as by-products.

• Equation: Glucose + Oxygen → Carbon Dioxide + Water + Energy

• Anaerobic Respiration: Occurs in the absence of oxygen, producing less energy. Common in certain bacteria, yeast, and muscle cells during intense exercise.

• Equation: Glucose → Lactic Acid + Energy (in muscles)

• In yeast: Glucose → Ethanol + Carbon Dioxide + Energy

4. Respiratory System in Humans

• Components: Includes the nasal cavity, trachea, bronchi, lungs, and diaphragm.

• Mechanism: Air is inhaled through the nose, passes down the trachea and bronchi, and reaches the lungs. Oxygen is exchanged for carbon dioxide in the alveoli (tiny air sacs).

• Breathing Process: Involves inhalation (taking in oxygen) and exhalation (releasing carbon dioxide).

5. Respiration in Other Organisms

• Plants: Respire through tiny openings called stomata. During the day, photosynthesis predominates, but respiration occurs all the

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Referring to NCERT solutions for Respiration In Organisms, Class 7 offers several benefits:

• Respiration In Organisms Class 7 Questions With Answers provides clear and concise explanations of concepts covered in the chapter, helping students understand the topic of respiration in organisms thoroughly.

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Important Study Materials for Science Chapter 6 Respiration in Organisms Class 7

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Conclusion

Vedantu’s NCERT Solutions for Class 7 Science Chapter 6: Respiration in Organisms is an excellent resource for understanding this vital biological process. It provides clear and simple explanations, making it easier for students to grasp concepts like the respiratory system, aerobic and anaerobic respiration, and the importance of breathing. Students should focus on understanding the function of different organs involved in respiration and the differences between various types of respiration. Previous year question papers often include 5-7 questions from this chapter, emphasising key concepts and processes. Using Vedantu’s solutions, students can effectively prepare and excel in their exams.

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