Chapter 10- Respiration in Organisms–Class 7 science Question and Answer (Short)

Chapter 10- Respiration in Organisms -Short Questions and Answers(Solved Worksheet)

Question- What is the role of oxygen in cellular respiration? 

Answer- In cellular respiration, oxygen aids in the breakdown of glucose, resulting in the release of energy, carbon dioxide, and water. It helps in converting glucose into simpler substances, thus facilitating energy release necessary for cellular functions.

Also Check – What is Cellular Respiration ?

Question- How is breathing related to respiration? 

Answer- Breathing is related to respiration as it involves the inhalation of oxygen from the environment and the exhalation of carbon dioxide. The oxygen inhaled is utilised in the cells for breaking down glucose, and the carbon dioxide generated during this breakdown is expelled from the body.

Question- What happens during aerobic respiration? 

Answer- During aerobic respiration, glucose breaks down in the presence of oxygen, resulting in the complete breakdown into carbon dioxide and water, and releasing maximum energy necessary for various cellular activities.

Question- What happens to muscles during heavy exercise due to anaerobic respiration?

Answer- During heavy exercise, muscles undergo anaerobic respiration due to a temporary deficiency of oxygen, causing a partial breakdown of glucose into lactic acid, which leads to muscle cramps.

Also Check – NCERT Exemplar Solutions- Class 7 Science Chapter 6- Respiration in Organisms.

Question- How does the breathing rate vary with physical activity levels? 

Answer- The breathing rate varies with physical activity levels, increasing during physical exertion when the body requires more oxygen and decreasing when the body is at rest.

Question- What products are formed during aerobic respiration? 

Answer- During aerobic respiration, glucose reacts with oxygen to produce carbon dioxide, water, and energy in the form of ATP.

Also Check -Rapid Revision – Class 7 Science- Chapter 10- Respiration in Organisms

Question- What is the role of the diaphragm in breathing? 

Answer- The diaphragm plays a crucial role in inhalation and exhalation by changing the thoracic cavity’s volume, assisting in drawing air into the lungs and expelling it out.

Question- How does the nasal cavity contribute to the breathing process? 

Answer- The nasal cavity filters, warms, and moistens the incoming air, preparing it for the lungs.

Question- What happens to the ribs and diaphragm during inhalation? 

Answer- During inhalation, the ribs move upwards and outwards, and the diaphragm contracts and flattens, increasing the chest cavity’s space.

Question- What does exhaled air contain more of compared to inhaled air? 

Answer- Exhaled air contains a higher concentration of carbon dioxide compared to inhaled air.

Question- Which respiratory organ do mammals use for breathing? 

Answer- Mammals use lungs as their respiratory organ for breathing.

Question- Through what do insects breathe? 

Answer- Insects breathe through a tracheal system which includes spiracles and tracheae.

Question- What respiratory adaptations do fish have for underwater breathing? 

Answer- Fish have gills that allow them to extract oxygen from water and expel carbon dioxide.

Question- Which animals can breathe through both lungs and skin? 

Answer- Amphibians, like frogs, can breathe through both lungs and skin.

Question- What does the rubber or plastic sheet represent in the breathing model? 

Answer- The rubber or plastic sheet represents the diaphragm in the breathing model.

Question- What observation is made when blowing into lime water? 

Answer- The lime water turns milky or cloudy.

Question- What causes the milkiness in the lime water during the experiment? 

Answer- The presence of carbon dioxide in the exhaled air causes the lime water to turn milky.

Question- What happens to plants when they are overwatered?

 Answer- Overwatering fills the air spaces in the soil, depriving roots of necessary oxygen, hampering their functionality and overall health.

Question- What are stomata? 

Answer- Stomata are microscopic openings or pores on plant leaves that allow them to exchange gases, intake oxygen, and release carbon dioxide.

Question- What does aerobic respiration in plants involve? 

Answer- Aerobic respiration in plants involves breaking down glucose into carbon dioxide and water in the presence of oxygen, releasing a significant amount of energy.

Question- What is a significant by-product of yeast respiration? 

Answer- Alcohol (Ethanol) is a major by-product of yeast respiration.

Question- What increases in frequency during heavy exercise? 

Answer- The breathing rate increases in frequency during heavy exercise.

Question- What family do yeasts belong to? 

Answer- Yeasts belong to the fungus family.

Question- What kind of respiration do yeasts primarily perform? 

Answer- Yeasts primarily perform anaerobic respiration.

Question- What adaptation occurs in breathing during exercise? 

Answer- The body adapts its breathing pattern, increasing frequency and depth of breaths during exercise.

Question- What is the role of the nasal cavity in relation to air impurities?

Answer- The nasal cavity, equipped with hair, acts as a filter, trapping air impurities like smoke, dust, and pollens, preventing them from entering the respiratory system.

Question- How does practising pranayama affect the lungs and oxygen intake? 

Answer- Pranayama is a traditional breathing exercise that helps in enhancing lung capacity and increasing oxygen intake, making more oxygen available to the body’s cells.

Question- What are the risks associated with breathing pure oxygen for extended periods?

Answer- Breathing pure oxygen for extended periods can lead to oxygen toxicity, causing conditions like inflammation and scarring of the lungs and other health issues.

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