Class 7 Science Chapter 6 Question Answers - Respiration in Organisms

Very Short Q & A :

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. glucose
4. none of these

Ans : ethyl alcohol

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 which is 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

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 exchange of gases. True/ False.

Ans : True