Class 7 Science Chapter 6 Question Answers - Respiration in Organisms

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Very Short Question Answers

Q1: Bacteria and fungi can respire ___________________.

Ans : Anaerobically

Q2: Name a single celled fungus and respires anaerobically to produce alcohol.

Ans : Yeast

Q3: Anaerobic respiration takes place in our skeletal muscles and produce ________

1. methyl alcohol
2. ethyl alcohol
3. lactic acid.
4. none of these

Ans : lactic acid.

Q4: What is anaerobic respiration?

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

Q5: 5.    Name the gas used by white blood cells to kill the invading bacteria. 

(a) Oxygen (b) Carbon dioxide (c)Nitrogen (d) Chlorine

Ans : Oxygen

Q6: What is the normal range of breathing rate per minute in an adult person?

Ans : 15 – 18

Q7: During heavy exercise we get cramps in the legs due to the accumulation of ______________

Ans : Lactic acid

Q8: What is respiration?

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

Q9: In cockroach air enters the body through_________________.

Ans : Spiracles

Q10: What will be the direction of diaphragm as we breathe in, and ribs move up or expand?

Ans : Direction of diaphragm is upwars and ribs move up.

Q11: Where is diaphragm located in the human body?

Ans : Below the lungs.

Q12: Each bronchus enters the lungs and divides into small tubes bronchioles which end up in air sacs called alveoli. True/ False.

Ans : True

Q13: The walls of alveoli are supplied with thin blood vessels called________

Ans : Capillaries

Q14: Name the respiratory organ of frogs.

Ans : Skin and lungs

Q15: Name the respiratory organ of earthworm.

Ans : Moist skin

Q16: How does exchange of gases take place in unicellular and smaller multicellular animals?

Ans : By diffusion

Q17: How does exchange of gases take place in insects?

Ans : Exchange of gases takes place in insect through spiracles into trachea.

Q18: During exhalation the ribs

1. move down and inwards
2. move upwards
3. move outwards
4. do not move at all

Ans : move down and inwards

Q19: Name the respiratory organ of birds.

Ans : Lungs.

Q20: Name the tiny pores present in the leaves of the plants for exchange of gases.

Ans : Stomata.

Q21: What is the end product of anaerobic respiration?

Ans : C02, alcohol and energy.

Q22: Name the chemical used to test the presence of CO2 in exhaled air.

Ans : Lime water

Q23: Yeast respire anaerobically to produce_____________.

Ans : Alcohol

Q24: Chest cavity is surrounded by _____________ of ribs.

Ans : 12 pairs

Q25: State the name of wind pipe.

Ans : Trachea

Q26: Spiracle is the muscular sheet which separates the abdomen from the chest cavity. True/ False.

Ans : False

This statement is incorrect. Spiracles are openings in the exoskeleton of some arthropods, and the muscular sheet separating the abdomen from the chest cavity is called the diaphragm. So, this is false because it wrongly defines spiracles as a diaphragm.

Q27: What is the percentage of oxygen in the inhaled air?

Ans : 21%

Q28: Breathing is a part of ________

Ans : Respiration.

Q29: What is the site of cellular respiration?

Ans : Mitochondria

Q30: Lenticels are present in which plant part for breathing

1. Root
2. Stem
3. Leaves
4. None of these.

Ans : Stem

Q31: During heavy exercise the breathing rate of a person slows down. True/ False.

Ans : False

Q32: The size of the chest cavity increases during inhalation. True/ False.

Ans : True

Q33: Which of the two is usually oxidised during respiration? Carbohydrate or fats?

Ans : Carbohydrate.

Q34: Which product in formed after anaerobic respiration in calf muscles?

Ans : Lactic acid

Q35: What is breathing rate?

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

Q36: Ravi is sleeping; his rate of breathing will be slow or higher?

Ans : Rate of breathing will be slow.

Q37: Swati is doing exercise; her rate of breathing will be slow or higher?

Ans : Higher

Q38: Smoking damages _______________.

Ans: Lungs

Q39: What is the percentage of carbon dioxide in inhaled air?

Ans: 0.04%

Q40: Gills in fishes are well supplied with blood vessels for the exchange of gases. True/ False.

Ans : True