Class 7 Science Chapter 6 Question Answers - Respiration in Organisms

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Q1: Name a single-celled fungus that respires anaerobically to produce alcohol.

Ans : Yeast

Q2: Bacteria and fungi can respire ___________________.

Ans : Anaerobically

Q3: What is the percentage of carbon dioxide in inhaled air?

Ans: 0.04%

Q4: What is anaerobic respiration?

Ans : The respiration which takes place in the absence of oxygen is called anaerobic respiration.

Q5: What is the normal range of breathing rate per minute in an adult person?

Ans : The normal breathing rate for an average adult at rest is typically between 15 and 18 breaths per minute.

Q6: During heavy exercise we get cramps in the legs due to the accumulation of ______________

Ans : Lactic acid

Q7: What is respiration?

Ans : The process of oxidation of food to release energy from absorb food in living cells is called respiration.

Q8: In cockroach air enters the body through_________________.

Ans : Air enters a cockroach's body through small openings called spiracles.

Q9: What will be the direction of diaphragm as we breathe in, and ribs move up or expand?

Ans : The direction of the diaphragm is upwards and ribs move up.

Q10: Where is the diaphragm located in the human body?

Ans : Below the lungs.

Q11: Each bronchus enters the lungs and divides into small tubes bronchioles which end up in air sacs called alveoli. True/ False.

Ans : True

Q12: The walls of alveoli are supplied with thin blood vessels called________

Ans : Capillaries

Q13: Name the respiratory organ of frogs.

Ans : Skin and lungs

Q14: Name the respiratory organ of earthworms.

Ans : Moist skin

Q15: How does the exchange of gases take place in insects?

Ans : The exchange of gases takes place in insects through spiracles in the trachea.

Q16: Gills in fishes are well supplied with blood vessels for the exchange of gases. True/ False.

Ans : True

Q17: Name the respiratory organ of birds.

Ans : Lungs.

Q18: Name the tiny pores present in the leaves of the plants for exchange of gases.

Ans : Stomata.

Q19: What is the end product of anaerobic respiration?

Ans : C0₂, alcohol and energy.

Q20: Name the chemical used to test the presence of CO₂ in exhaled air.

Ans : Lime water

Q21: Yeast respire anaerobically to produce_____________.

Ans : Alcohol

Q22: Chest cavity is surrounded by _____________ of ribs.

Ans : 12 pairs

Q23: State the name of wind pipe.

Ans : Trachea

Q24: Spiracle is the muscular sheet that separates the abdomen from the chest cavity. True/ False.

Ans : False

Q25: What is the percentage of oxygen in the inhaled air?

Ans : 21%

Q26: Breathing is a part of ________

Ans : Respiration.

Q27: What is the site of cellular respiration?

Ans : Mitochondria

Q28: Lenticels are present in which plant part for breathing

i. Root
​ii. Stem
​iii. Leaves
​iv. None of these.

Ans : ii. Stem

Q29: During heavy exercise the breathing rate of a person slows down. True/ False.

Ans : False

Q30: The size of the chest cavity increases during inhalation. True/ False.

Ans : True

Q31: Which of the two is usually oxidised during respiration? Carbohydrate or fats.

Ans : Carbohydrate.

Q32: Which product in formed after anaerobic respiration in calf muscles?

Ans : Lactic acid

Q33: What is your breathing rate?

Ans : The number of times a person breathes in a minute is termed as the breathing rate.

Q34: Ravi is sleeping; his rate of breathing will be slow or higher?

Ans : Rate of breathing will be slow.

Q35: Swati is doing exercise; her rate of breathing will be slow or higher?

Ans : Higher