Respiration in Organisms- Worksheets
These worksheets are designed to support the chapter “Respiration in Organisms.” This chapter explains how different organisms, including humans, perform respiration. The worksheets, provided in both solved and unsolved formats, are aimed at reinforcing the understanding of this vital biological process.
Key concepts covered in the chapter and explored in these worksheets include-
- Basics of Respiration- Understanding how organisms take in oxygen and give out carbon dioxide, and why this process is essential.
- Types of Respiration- Learning about aerobic and anaerobic respiration and how they differ in terms of oxygen usage.
- Respiratory Systems in Different Organisms- Exploring how various organisms like humans, insects, and plants respire.
The solved worksheets offer methods and solutions to understand these topics, while the unsolved worksheets provide opportunities for students to practise and self-assess their knowledge.
Also Check –Class 7 Science -Chapter 10- Respiration in Organisms- Deatailed Notes
Table of Contents
Worksheet 1 – Respiration in Organisms – Student Worksheet (Unsolved)
Explain the relationship between cellular respiration and energy production in cells.
Differentiate between aerobic and anaerobic respiration. Provide examples of organisms that use each type.
Describe the role of yeast in anaerobic respiration and its industrial applications.
Explain how anaerobic respiration occurs in human muscles during heavy exercise. What is the byproduct of this process?
Compare and contrast aerobic and anaerobic respiration in terms of energy production, reactants, and products.
True or False-
- (i) All living organisms perform aerobic respiration. (T/F)
- (ii) Anaerobic respiration always produces alcohol as a byproduct. (T/F)
- (iii) Lactic acid is formed during aerobic respiration in muscles. (T/F)
- (iv) Yeast can survive in both oxygen-rich and oxygen-poor environments. (T/F)
- (v) Carbon dioxide is a product of aerobic respiration. (T/F)
Discuss the process of breathing in humans, including the steps of inhalation and exhalation.
Explain why-
- (a) Breathing rate increases during exercise.
- (b) Muscle cramps occur due to anaerobic respiration.
- (c) Overwatering plants can be harmful.
Describe the mechanism of gas exchange in insects like cockroaches.
How do aquatic animals like fish respire? Describe the function of gills in fish.
What is the role of stomata in plant respiration? Explain how gas exchange occurs in leaves.
Discuss the importance of respiratory organs in different organisms and how they are adapted to their environments.
Also Check -Rapid Revision – Class 7 Science- Chapter 10- Respiration in Organisms
Worksheet 1 – Respiration in Organisms – Solved Worksheet
Explain the relationship between cellular respiration and energy production in cells.
- Cellular respiration is the process by which cells convert nutrients (primarily glucose) into energy (ATP). This process involves the breakdown of glucose in the presence of oxygen, resulting in the production of ATP, which is used by the cells for various functions.
Differentiate between aerobic and anaerobic respiration. Provide examples of organisms that use each type.
- Aerobic respiration- It occurs in the presence of oxygen and produces more energy (ATP). It’s common in humans, animals, and many microorganisms.
- Anaerobic respiration- It occurs in the absence of oxygen, producing less energy. Examples include certain bacteria and yeast (which perform fermentation).
Describe the role of yeast in anaerobic respiration and its industrial applications.
- Yeast performs anaerobic respiration (fermentation) by converting glucose into alcohol and carbon dioxide. This process is used in industries for brewing, winemaking, and baking.
Explain how anaerobic respiration occurs in human muscles during heavy exercise. What is the byproduct of this process?
- During heavy exercise, when oxygen supply is insufficient, muscle cells switch to anaerobic respiration, breaking down glucose into lactic acid. This process provides energy quickly but leads to the accumulation of lactic acid, causing muscle fatigue and cramps.
Compare and contrast aerobic and anaerobic respiration in terms of energy production, reactants, and products.
- Energy Production- Aerobic respiration produces more ATP compared to anaerobic.
- Reactants- Both use glucose as a primary reactant, but aerobic requires oxygen.
- Products- Aerobic produces carbon dioxide, water, and energy, whereas anaerobic results in lactic acid (in muscles) or alcohol and carbon dioxide (in yeast).
True or False-
- (i) All living organisms perform aerobic respiration. (F)
- (ii) Anaerobic respiration always produces alcohol as a byproduct. (F)
- (iii) Lactic acid is formed during aerobic respiration in muscles. (F)
- (iv) Yeast can survive in both oxygen-rich and oxygen-poor environments. (T)
- (v) Carbon dioxide is a product of aerobic respiration. (T)
Discuss the process of breathing in humans, including the steps of inhalation and exhalation.
- Breathing in humans involves inhalation (drawing oxygen into the lungs) and exhalation (expelling carbon dioxide). During inhalation, the diaphragm contracts, expanding the chest cavity, and oxygen is drawn into the lungs. During exhalation, the diaphragm relaxes, the chest cavity contracts, and carbon dioxide is expelled.
Explain why-
- (a) Breathing rate increases during exercise to supply more oxygen for increased cellular respiration.
- (b) Muscle cramps occur due to the accumulation of lactic acid from anaerobic respiration.
- (c) Overwatering plants can lead to oxygen deprivation in roots, affecting respiration.
Describe the mechanism of gas exchange in insects like cockroaches.
- Insects like cockroaches have a tracheal system for gas exchange. Oxygen enters through spiracles (small openings) and travels through tracheae (a network of tubes), reaching cells directly. Carbon dioxide follows the reverse path to exit the body.
How do aquatic animals like fish respire? Describe the function of gills in fish.
- Fish respire through gills, which extract oxygen dissolved in water. Water passes over gill filaments, and oxygen is absorbed into the bloodstream while carbon dioxide is released.
What is the role of stomata in plant respiration? Explain how gas exchange occurs in leaves.
- Stomata are tiny openings in leaves that facilitate gas exchange. Oxygen and carbon dioxide pass through these stomata, enabling the process of respiration and photosynthesis.
Discuss the importance of respiratory organs in different organisms and how they are adapted to their environments.
- Respiratory organs are adapted to efficiently obtain oxygen from an organism’s environment, whether air (lungs in humans and animals) or water (gills in fish). They are crucial for survival, as they provide the means for gas exchange, essential for cellular respiration.
Also Check – NCERT Exemplar Solutions- Class 7 Science Chapter 6- Respiration in Organisms.
Worksheet 2 – Respiration in Organisms – Student Worksheet (Unsolved)
Describe how cells obtain energy from food through the process of respiration.
Compare aerobic and anaerobic respiration, mentioning the energy yield and end products of each.
Explain the role of yeast in anaerobic respiration and its industrial significance.
Discuss anaerobic respiration in human muscles during intense exercise, including the byproducts formed.
Elaborate on the breathing process in humans, detailing the role of the diaphragm and lungs.
True or False-
- (i) All animals respire aerobically. (T/F)
- (ii) Insects, such as cockroaches, use lungs for respiration. (T/F)
- (iii) Plants take in oxygen for respiration through lenticels and stomata. (T/F)
- (iv) Overwatering plants can lead to a lack of oxygen for roots, causing harm to the plant. (T/F)
- (v) Amphibians like frogs use gills for respiration underwater. (T/F)
Describe the respiratory system of a cockroach and how it differs from that of humans.
Explain how gills function in aquatic animals for gas exchange.
Discuss the process of photosynthesis in plants and its relation to respiration.
Why do plants need to respire if they produce oxygen during photosynthesis?
Describe the adaptations in different organisms for efficient respiration, such as in earthworms and amphibians.
How do different parts of a plant (leaves, stems, roots) participate in the process of respiration?
Also Check – Chapter 10- Respiration in Organisms–Class 7 science- Question and Answer (Fill in the Blanks)
Worksheet 2 – Respiration in Organisms – Solved Worksheet
Describe how cells obtain energy from food through the process of respiration.
- Cells obtain energy from food through respiration, where glucose from food combines with oxygen to produce energy in the form of ATP (adenosine triphosphate). This process involves breaking down food into simpler substances and releasing energy stored in the chemical bonds.
Compare aerobic and anaerobic respiration, mentioning the energy yield and end products of each.
- Aerobic Respiration- Occurs in the presence of oxygen, producing a high amount of energy. The end products are carbon dioxide, water, and energy. Examples- human beings, many animals.
- Anaerobic Respiration- Occurs in the absence of oxygen, producing a low amount of energy. End products vary; in yeast, it’s ethanol and carbon dioxide (alcohol fermentation), while in human muscle cells, it’s lactic acid.
Explain the role of yeast in anaerobic respiration and its industrial significance.
- Yeast performs anaerobic respiration (fermentation), releasing ethanol and carbon dioxide as byproducts. This is crucial in industries for making wine, beer, and in baking, where carbon dioxide causes bread to rise.
Discuss anaerobic respiration in human muscles during intense exercise, including the byproducts formed.
- During intense exercise, human muscles may undergo anaerobic respiration due to insufficient oxygen supply. This process produces lactic acid along with energy, leading to muscle cramps. Relief from cramps can be achieved through measures like a hot water bath or massage, which improve blood circulation and oxygen supply to break down lactic acid.
Elaborate on the breathing process in humans, detailing the role of the diaphragm and lungs.
- Breathing in humans involves inhaling oxygen-rich air through nostrils, which then travels through the nasal cavity, windpipe, and into the lungs located in the chest cavity, surrounded by ribs. The diaphragm, a muscle sheet under the chest cavity, moves downwards and ribs move outwards as lungs expand during inhalation. During exhalation, the diaphragm and ribs return to their original positions, pushing air out of the lungs.
True or False-
- (i) All animals respire aerobically. (F) – Some organisms undergo anaerobic respiration.
- (ii) Insects, such as cockroaches, use lungs for respiration. (F) – They use a tracheal system.
- (iii) Plants take in oxygen for respiration through lenticels and stomata. (T)
- (iv) Overwatering plants can lead to a lack of oxygen for roots, causing harm to the plant. (T)
- (v) Amphibians like frogs use gills for respiration underwater. (F) – They use moist skin and lungs.
Describe the respiratory system of a cockroach and how it differs from that of humans.
- Cockroaches respire through a tracheal system, where air enters through spiracles on the sides of their bodies and diffuses into cells via the trachea. This is different from human respiration, which involves lungs and a diaphragm.
Explain how gills function in aquatic animals for gas exchange.
- In aquatic animals, gills are comb-like structures that allow the exchange of gases (oxygen and carbon dioxide) with water. Water flows over the gill filaments, where oxygen is absorbed into the bloodstream, and carbon dioxide is expelled.
Discuss the process of photosynthesis in plants and its relation to respiration.
- Photosynthesis in plants involves taking in carbon dioxide and using it, along with sunlight, to produce food (glucose) and release oxygen. This process is complementary to respiration, where oxygen is used to break down food for energy, releasing carbon dioxide.
Why do plants need to respire if they produce oxygen during photosynthesis?
- Plants respire to break down the food (glucose) produced during photosynthesis to release energy needed for their vital functions. Respiration in plants occurs continuously, unlike photosynthesis, which happens only in the presence of light.
Describe the adaptations in different organisms for efficient respiration, such as in earthworms and amphibians.
- Earthworms respire through their moist skin, absorbing oxygen directly. Amphibians like frogs use their moist skin for respiration underwater and lungs on land, adapting to both aquatic and terrestrial environments.
How do different parts of a plant (leaves, stems, roots) participate in the process of respiration?
- Leaves use stomata for gas exchange, stems use lenticels, and roots use hair-like structures to absorb air present in the soil, enabling efficient respiration throughout the plant.
Also Check –Chapter 10- Respiration in Organisms–Class 7 science Question and Answer (MCQs)
Worksheet 3 – Respiration in Organisms – Student Worksheet (Unsolved)
Explain the process of external respiration in humans and its significance.
Describe the differences between aerobic and anaerobic respiration, including the end products of each.
Discuss the role of yeast in anaerobic respiration and its practical applications in industries.
Explain the phenomenon of anaerobic respiration in human muscles during intense physical activity and its effects.
Describe the various ways in which different organisms carry out respiration, focusing on unique adaptations.
True or False-
- (i) Anaerobic respiration always results in the production of lactic acid. (T/F)
- (ii) The process of breathing in humans is controlled by the brain. (T/F)
- (iii) Only animals respire, plants do not need respiration. (T/F)
- (iv) Yeast can only respire in the presence of oxygen. (T/F)
- (v) Respiration in plants occurs only during the night. (T/F)
Discuss the respiratory system in insects, emphasising the role of the tracheal system.
Explain how fish breathe underwater using gills.
Describe the process of gas exchange in plant leaves, including the role of stomata.
How do roots of plants participate in respiration? What happens if a plant is overwatered?
Discuss the changes in the respiratory rate of humans during different activities and states (e.g., sleeping, running).
Why is it advised not to sleep under trees at night in terms of respiration in plants?
Also Check –Chapter 10- Respiration in Organisms–Class 7 Science – Question and Answer (Long Answer)
Worksheet 3 – Respiration in Organisms – Solved Worksheet
Explain the process of external respiration in humans and its significance.
- External respiration in humans involves the exchange of gases between the environment and the lungs. During inhalation, oxygen-rich air is drawn into the lungs, where oxygen is absorbed into the bloodstream through the alveoli. During exhalation, carbon dioxide, a waste product of cellular respiration, is expelled from the body. This process is crucial for providing oxygen necessary for cellular respiration and removing carbon dioxide.
Describe the differences between aerobic and anaerobic respiration, including the end products of each.
- Aerobic Respiration- Occurs in the presence of oxygen, producing a high amount of energy (ATP). End products are carbon dioxide, water, and energy. Common in humans and most animals.
- Anaerobic Respiration- Occurs in the absence of oxygen, producing less energy. In yeast, end products are ethanol and carbon dioxide, while in human muscle cells, it is lactic acid.
Discuss the role of yeast in anaerobic respiration and its practical applications in industries.
- Yeast performs anaerobic respiration or fermentation, converting glucose into ethanol and carbon dioxide. This is used in baking, where carbon dioxide helps bread rise, and in brewing and winemaking industries for alcohol production.
Explain the phenomenon of anaerobic respiration in human muscles during intense physical activity and its effects.
- During intense physical activity, when oxygen supply to muscles is inadequate, muscles undergo anaerobic respiration, converting glucose into lactic acid and energy. The accumulation of lactic acid can lead to muscle fatigue and cramps.
Describe the various ways in which different organisms carry out respiration, focusing on unique adaptations.
- Different organisms have adapted to their environments to facilitate respiration. For example, fish use gills to extract oxygen from water, insects use a tracheal system for gas exchange, and plants use stomata on leaves and lenticels on stems for gas exchange.
True or False-
- (i) Anaerobic respiration always results in the production of lactic acid. (F) – It can also produce ethanol and carbon dioxide in yeast.
- (ii) The process of breathing in humans is controlled by the brain. (T)
- (iii) Only animals respire, plants do not need respiration. (F) – Plants also respire.
- (iv) Yeast can only respire in the presence of oxygen. (F) – It can respire anaerobically.
- (v) Respiration in plants occurs only during the night. (F) – It occurs continuously.
Discuss the respiratory system in insects, emphasising the role of the tracheal system.
- Insects have a tracheal system for respiration, consisting of a network of tubes (tracheae) that distribute air throughout the body. Oxygen enters through spiracles (small openings on the body surface) and is transported directly to cells via the tracheae.
Explain how fish breathe underwater using gills.
- Fish breathe underwater using gills, which are specialised organs for extracting oxygen from water. Water enters through the mouth, flows over the gill filaments where oxygen is absorbed into the bloodstream, and carbon dioxide is released, then exits through the gill slits.
Describe the process of gas exchange in plant leaves, including the role of stomata.
- In plant leaves, gas exchange occurs through stomata, small openings on the leaf surface. Oxygen produced during photosynthesis is released, and carbon dioxide required for photosynthesis is absorbed through these stomata.
How do roots of plants participate in respiration? What happens if a plant is overwatered?
- Plant roots respire by absorbing oxygen from the air spaces in the soil. Overwatering fills these air spaces with water, depriving roots of oxygen, which can lead to root damage or plant death.
Discuss the changes in the respiratory rate of humans during different activities and states (e.g., sleeping, running).
- The human respiratory rate varies with different activities. It slows down during sleep and increases during physical activities like running to meet the higher oxygen demand of the body.
Why is it advised not to sleep under trees at night in terms of respiration in plants?
- It’s often advised not to sleep under trees at night because, during the night, plants release more carbon dioxide due to the lack of photosynthesis, which could potentially lead to discomfort or harm in an enclosed space.
Also Check –Chapter 10- Respiration in Organisms–Class 7 science Question and Answer (Short)
Worksheet 4 – Respiration in Organisms – Student Worksheet (Unsolved)
Fill in the blanks-
- (a) Breathing in animals involves intake of __________ and release of __________ as part of external respiration.
- (b) In humans, the primary organs for breathing are the __________.
- (c) Anaerobic respiration in yeast produces __________ and __________.
- (d) During intense activities, muscles undergo anaerobic respiration producing __________ as a byproduct.
- (e) The tiny pores on the surface of leaves through which plants respire are called __________.
Mark ‘T’ if the statement is true and ‘F’ if it is false-
- (a) All organisms need oxygen for respiration. (T/F)
- (b) Aerobic respiration produces more energy than anaerobic respiration. (T/F)
- (c) Fish use lungs for respiration. (T/F)
- (d) Roots of the plants also take part in respiration. (T/F)
Tick (✓) mark the correct answer in each of the following-
- (a) Which one of these organisms uses a tracheal system for respiration?
- (i) Humans (ii) Fish (iii) Cockroaches (iv) Plants
- (b) What is produced as a waste product in respiration?
- (i) Oxygen (ii) Nitrogen (iii) Carbon dioxide (iv) Water
Match the items of Column I with those given in Column II-
- Column I
- (a) Lungs
- (b) Stomata
- (c) Gills
- (d) Spiracles
- Column II
- (i) Found in fish and helps in breathing underwater
- (ii) Openings on the body of insects for gas exchange
- (iii) Primary breathing organ in humans and mammals
- (iv) Pores on leaves for gas exchange
Why is it not advisable for roots to be waterlogged for a long period?
What is the role of the diaphragm in human respiration?
Describe the process of gas exchange in gills of fish.
Explain the importance of oxygen in cellular respiration.
Discuss the adaptive features of respiration in amphibians like frogs.
Explain how plants carry out respiration during the night and day, and why it’s advised not to sleep under a tree at night.
Also Check –Class 7 science -Chapter 10- Respiration in Organisms– Definition and Explanation of Important Keywords
Worksheet 4 – Respiration in Organisms – Solved Worksheet
Fill in the blanks-
- (a) Breathing in animals involves the intake of oxygen and the release of carbon dioxide as part of external respiration.
- (b) In humans, the primary organs for breathing are the lungs.
- (c) Anaerobic respiration in yeast produces alcohol (ethanol) and carbon dioxide.
- (d) During intense activities, muscles undergo anaerobic respiration producing lactic acid as a byproduct.
- (e) The tiny pores on the surface of leaves through which plants respire are called stomata.
Mark ‘T’ if the statement is true and ‘F’ if it is false-
- (a) All organisms need oxygen for respiration. (F) – Some organisms use anaerobic respiration.
- (b) Aerobic respiration produces more energy than anaerobic respiration. (T)
- (c) Fish use lungs for respiration. (F) – Fish use gills.
- (d) Roots of the plants also take part in respiration. (T)
Tick (✓) mark the correct answer in each of the following-
- (a) Which one of these organisms uses a tracheal system for respiration?
- (iii) Cockroaches ✓
- (b) What is produced as a waste product in respiration?
- (iii) Carbon dioxide ✓
Match the items of Column I with those given in Column II-
- (a) Lungs – (iii) Primary breathing organ in humans and mammals
- (b) Stomata – (iv) Pores on leaves for gas exchange
- (c) Gills – (i) Found in fish and helps in breathing underwater
- (d) Spiracles – (ii) Openings on the body of insects for gas exchange
Why is it not advisable for roots to be waterlogged for a long period?
- Waterlogging prevents roots from accessing oxygen, which is essential for respiration. Lack of oxygen can lead to root damage or death of the plant.
What is the role of the diaphragm in human respiration?
- The diaphragm plays a crucial role in respiration by contracting and flattening during inhalation, which increases the chest cavity’s volume and draws air into the lungs. During exhalation, it relaxes and moves upward, reducing the chest cavity’s volume and expelling air.
Describe the process of gas exchange in gills of fish.
- In fish, gills facilitate gas exchange by extracting dissolved oxygen from water. Water enters through the mouth, flows over the gill filaments where oxygen is absorbed into the bloodstream, and carbon dioxide is expelled.
Explain the importance of oxygen in cellular respiration.
- Oxygen is crucial in cellular respiration as it acts as the final electron acceptor in the electron transport chain, allowing the release of energy from food molecules. This process produces ATP, the energy currency of the cell.
Discuss the adaptive features of respiration in amphibians like frogs.
- Amphibians like frogs can respire through their skin (cutaneous respiration) in water and use lungs for respiration on land. This dual respiratory system allows them to live both in aquatic and terrestrial environments.
Explain how plants carry out respiration during the night and day, and why it’s advised not to sleep under a tree at night.
- Plants respire both day and night. During the day, photosynthesis also occurs, producing oxygen. At night, only respiration occurs, releasing carbon dioxide. It’s advised not to sleep under a tree at night because of the increased carbon dioxide release in the absence of photosynthesis.
Also Check –NCERT Solutions for Class 7 Science Chapter 10 Respiration in Organisms
Worksheet 5 – Respiration in Organisms – Student Worksheet (Unsolved)
Fill in the blanks-
- (a) Aerobic respiration involves breaking down glucose in the presence of __________ to produce __________ and __________.
- (b) The process of __________ respiration in muscles during heavy exercise leads to the production of __________.
- (c) In fish, the __________ are the main respiratory organs for extracting __________ from water.
- (d) The __________ is a dome-shaped muscle crucial for the process of __________ in humans.
- (e) Insects like cockroaches use __________ and __________ for the direct delivery of air to tissues.
Mark ‘T’ if the statement is true and ‘F’ if it is false-
- (a) The human breathing rate increases during heavy exercise. (T/F)
- (b) Plants do not undergo cellular respiration. (T/F)
- (c) Anaerobic respiration in yeast produces ethanol. (T/F)
- (d) Mammals breathe using spiracles. (T/F)
Tick (✓) mark the correct answer in each of the following-
- (a) The primary gas exchanged in the lungs during respiration is-
- (i) Nitrogen (ii) Oxygen (iii) Carbon Dioxide (iv) Hydrogen
- (b) During inhalation, the diaphragm-
- (i) Relaxes (ii) Contracts (iii) Remains stationary (iv) Expands
Match the items of Column I with those given in Column II-
- Column I
- (a) Gills
- (b) Tracheae
- (c) Diaphragm
- (d) Ribs
- Column II
- (i) Facilitate air movement in insects
- (ii) Expand and contract during breathing in mammals
- (iii) Extract oxygen from water in fish
- (iv) Contracts and flattens during inhalation in humans
Why is aerobic respiration considered more efficient than anaerobic respiration?
What is the significance of the rib cage in the human respiratory system?
Describe how carbon dioxide is expelled from the body during respiration.
Explain the importance of gills in aquatic organisms like fish.
How do insects like cockroaches ensure efficient gas exchange?
Discuss the adaptations in the respiratory system of mammals for efficient gas exchange.
Also Check –What is Cellular Respiration Class 7 – Chapter 10- Respiration in Organisms
Worksheet 5 – Respiration in Organisms – Solved Worksheet
Fill in the blanks-
- (a) Aerobic respiration involves breaking down glucose in the presence of oxygen to produce energy (ATP) and carbon dioxide.
- (b) The process of anaerobic respiration in muscles during heavy exercise leads to the production of lactic acid.
- (c) In fish, the gills are the main respiratory organs for extracting oxygen from water.
- (d) The diaphragm is a dome-shaped muscle crucial for the process of breathing in humans.
- (e) Insects like cockroaches use tracheae and spiracles for the direct delivery of air to tissues.
Mark ‘T’ if the statement is true and ‘F’ if it is false-
- (a) The human breathing rate increases during heavy exercise. (T)
- (b) Plants do not undergo cellular respiration. (F) – Plants do perform cellular respiration.
- (c) Anaerobic respiration in yeast produces ethanol. (T)
- (d) Mammals breathe using spiracles. (F) – Spiracles are used by insects, not mammals.
Tick (✓) mark the correct answer in each of the following-
- (a) The primary gas exchanged in the lungs during respiration is-
- (ii) Oxygen ✓
- (b) During inhalation, the diaphragm-
- (ii) Contracts ✓
Match the items of Column I with those given in Column II-
- (a) Gills – (iii) Extract oxygen from water in fish
- (b) Tracheae – (i) Facilitate air movement in insects
- (c) Diaphragm – (iv) Contracts and flattens during inhalation in humans
- (d) Ribs – (ii) Expand and contract during breathing in mammals
Why is aerobic respiration considered more efficient than anaerobic respiration?
- Aerobic respiration is more efficient because it produces significantly more ATP (energy) per glucose molecule than anaerobic respiration, due to the complete breakdown of glucose in the presence of oxygen.
What is the significance of the rib cage in the human respiratory system?
- The rib cage protects the lungs and heart and plays a role in the breathing process. During inhalation, the ribs move upwards and outwards, expanding the chest cavity and allowing the lungs to fill with air.
Describe how carbon dioxide is expelled from the body during respiration.
- During exhalation, the diaphragm and intercostal muscles relax, causing the chest cavity to decrease in volume. This increased pressure in the lungs forces carbon dioxide, a waste product of cellular respiration, out of the body.
Explain the importance of gills in aquatic organisms like fish.
- Gills in fish are specialised organs for extracting dissolved oxygen from water. They have a large surface area, rich in blood vessels, allowing for efficient gas exchange, which is crucial for fish to perform cellular respiration underwater.
How do insects like cockroaches ensure efficient gas exchange?
- Insects like cockroaches have a tracheal system for respiration. This system consists of a network of tubes (tracheae) and openings (spiracles) that allow direct air flow to tissues, ensuring efficient gas exchange.
Discuss the adaptations in the respiratory system of mammals for efficient gas exchange.
- Mammals have a highly efficient respiratory system consisting of lungs with alveoli that provide a large surface area for gas exchange. The diaphragm and ribcage facilitate the expansion and contraction of the lungs, enabling efficient inhalation and exhalation.
Also Check –What is Respiration Class 7 – Chapter 10- Respiration in Organisms
