Class 7 Science Chapter 6 Important Question Answers - Respiration in Organisms

Very Short Answer Type Questions

Q1: What is the process by which cells release energy from glucose?
Ans: The process by which cells release energy from glucose is called respiration.

Q2: What is the product of glucose breakdown in the presence of oxygen?
Ans: In the presence of oxygen, glucose is broken down into energy, water, and carbon dioxide.

Q3: What is the product of glucose breakdown in muscle cells in the absence of oxygen?
Ans: In muscle cells in the absence of oxygen, glucose is converted into lactic acid and carbon dioxide.

Q4: How is yeast used in beverage industries?
Ans: Yeast is used in beverage industries to produce beer and wine by converting glucose into alcohol and carbon dioxide in the absence of oxygen.

Q5: When do plants release carbon dioxide, and when do they take in oxygen?
Ans: During the night, plants release carbon dioxide, and during the day, they take in oxygen for respiration.

Q6: What is the process in which glucose is broken down in cells to release energy called?
Ans: The process in which glucose is broken down in cells to release energy is called cellular respiration.

Q7: What is the term for the breakdown of glucose in the presence of oxygen?
Ans: The breakdown of glucose in the presence of oxygen is called aerobic respiration.

Q8: What is the role of red blood cells in the transportation of oxygen to cells?
Ans: Red blood cells absorb oxygen from the lungs and transport it to all the cells in the body.

Q9: What causes muscle cramps during strenuous exercises?
Ans: Muscle cramps during strenuous exercises are caused by the accumulation of lactic acid in the muscles during anaerobic respiration.

Q10: What is the term for organisms that respire in the absence of oxygen?
Ans: Organisms that respire in the absence of oxygen are called anaerobes.

Short Answer Type Questions

Q11: Explain the process of respiration in organisms.
Ans: Respiration is the process by which cells release energy from glucose. Glucose is broken down in the presence of oxygen to produce energy, water, and carbon dioxide. In the absence of oxygen, glucose can be converted into lactic acid and carbon dioxide, leading to muscle cramps.

Q12: How do plants exchange gases, and what is the role of stomata in this process?
Ans: Plants exchange gases through a special structure called stomata. Stomata are small openings in plant leaves and stems that allow the entry of carbon dioxide and the exit of oxygen during photosynthesis. At night, plants take in oxygen through stomata and release carbon dioxide and water vapor.

Q13: Describe the role of cellular respiration in releasing energy from food.
Ans: Cellular respiration is the process by which cells break down glucose to release energy. This energy is used for various activities like growth, excretion, reproduction, and even everyday tasks like running, reading, and sleeping. Digestive juices convert complex carbohydrates into glucose, which is then absorbed by the blood and transported to cells for energy production.

Q14: Explain the process of breathing in humans.
Ans: Breathing in humans involves two steps: inhalation and exhalation. During inhalation, air rich in oxygen is pulled into the lungs as the diaphragm contracts and the rib cage expands. During exhalation, air rich in carbon dioxide is pushed out as the diaphragm relaxes and the rib cage contracts. Breathing rate is the number of breaths per minute, typically 15-18 breaths.

Q15: How do insects and animals like frogs and earthworms respire?
Ans: Insects respire through special organs called spiracles, which allow oxygen to directly reach their cells through diffusion. Frogs and earthworms respire through their moist and slimy skin, which facilitates the exchange of gases with the environment. Frogs can also respire through their lungs when on land.

Q16: What are the different respiratory organs in various organisms, and how do they obtain oxygen?
Ans: Different organisms have different respiratory organs. Insects have spiracles, frogs and earthworms have moist skin, and fish have gills. Insects obtain oxygen through spiracles, frogs through skin and lungs, and fish through gills by extracting dissolved oxygen from water.

Q17: How does the human respiratory system protect against unwanted particles in the air?
Ans: The human respiratory system protects against unwanted particles by using tiny hairs in the nasal cavity to trap dust, smoke, and pollen. Additionally, the mucous lining from the nasal cavity to the lungs helps trap and remove unwanted particles.

Q18: Explain the role of the diaphragm in the process of breathing.
Ans: The diaphragm is a large muscular sheet that forms the floor of the chest cavity. It plays a crucial role in breathing by contracting during inhalation, which expands the chest cavity and allows air to enter the lungs. During exhalation, the diaphragm relaxes, pushing air out of the lungs.

Q19: How do fish obtain oxygen for respiration, and what are their respiratory organs?
Ans: Fish obtain oxygen for respiration through gills. During respiration, water enters their mouths, passes over their gills, and exits through the operculum. Gills extract dissolved oxygen from water and release carbon dioxide.

Q20: How do insects respire, and what are their specialized respiratory structures?
Ans: Insects respire through specialized structures called spiracles. Spiracles are openings on the insect's body that allow air to enter directly into the insect's tracheal tubes, where oxygen diffuses to reach cells.