VELAMMAL VIDHYASHRAM MAMBAKKAM
GRADE 10 BIOLOGY
RESPIRATION - WORKSHEET
1. In which part of the respiratory system, gaseous exchange takes place?
(a) Alveoli
(b) Pharynx
(c) Larynx
(d) Trachea
Sol. (a) Alveoli.
2. ___________ is located between two pleural sacs and is the central compartment of the thoracic
cavity?
(a) Hilum
(b) Pleura
(c) Mediastinum
(d) Thoracic cage
Sol. (c) Mediastinum.
3. Which of the following statements is true about involuntary breathing?
(a) It is controlled by the bronchioles
(b) It is controlled by the pulmonary arterioles
(c) It is controlled by the alveolar-capillary network
(d) It is controlled by the neurons, located in the medulla and pons
Sol. (d) It is controlled by the neurons, located in the medulla and pons.
4. Which of the following are parts of the human respiratory system?
(a) Trachea
(b) Diaphragm
(c) The lungs
(d) All of the above
Sol. (d) All of the above.
5. Which of the following gas is released out during the process of respiration?
(a) Oxygen
(b) Hydrogen
(c) Carbon dioxide
(d) None of the above
Sol. (c) Carbon dioxide.
6. The tiny air sacs present in human lungs is called_______.
(a) Alveoli
(b) Bronchus
(c) Bronchioles
(d) All of the above
Sol. (a) Alveoli.
7. Which of the following functions by filtering and keeping the mucus and dirt away from our lungs?
(a) Cilia
(b) Bronchioles
(c) Hairs in the lungs
(d) All of the above
Sol. (a) Cilia.
8. The total number of alveoli present in the human lungs is estimated to be around ______.
(a) 1 billion
(b) 800 million
(c) 500 million
(d) 1500 million
Sol: (c) 500 million.
9. The exchange of gases between the external environment and the lungs______.
(a) Respiration
(b) External respiration
(c) Cellular respiration
(d) None of the above
Sol: (b) External respiration
10. Which one of the following statements is false about the trachea?
(a) Has C-shaped rings
(b) It is covered by epiglottis
(c) It splits into the right and left lungs
(d) None of the above
Sol: (b) It is covered by epiglottis
11. The maximum volume of air contained in the lung by a full forced inhalation is called _________.
(a) Tidal volume
(b) Vital capacity
(c) Ventilation rate
(d) Total lung capacity
Sol: (d) Total lung capacity.
12. Which one of the following is correct regarding larynx?
(a) It houses the vocal cords
(b) It prevents the invading pathogens into the trachea
(c) It is an organ made of cartilage and connects the pharynx to the trachea
(d) All of the above.
Sol: (d) All of the above.
13. Which of the following is the function of the trachea?
(a) Gaseous Exchange
(b) Filters the air we breathe
(c) Exhales the air from the body
(d) All of the above
Sol: (b) Filters the air we breathe.
14. Which of these statements is true about internal respiration?
(a) Production of ATP
(b) Exchange of gases between the bloodstream and tissue cells
(c) Exchange of gases between alveoli and the bloodstream
(d) Breathing between the atmosphere and the alveoli
Sol: (b) Exchange of gases between the bloodstream and tissue cells.
15. Which of the following organs functions as an air conditioner?
(a) Larynx
(b) Pharynx
(c) Nasal chambers
(d) All of the above
Sol: (c) Nasal chambers.
16. The normal breathing process is controlled by ____________.
(a) Lungs
(b) Ventral respiratory group
(c) Dorsal respiratory group
(d) Both (b) and (c)
Sol: (d) Both (b) and (c).
17. In Aves, the exchange of gases occurs within the __________.
(a) Lungs
(b) Air sacs
(c) Air sacs and Lungs
(d) None of the above
Sol: (a) Lungs.
18. Which of the following statements is true about the entry of air into the lungs?
(a) Air enters the body and travels to the lungs through the mouth and the nose
(b) Air enters the body and travels to the lungs through the oesophagus and gullet
(c) Air enters the body and travels to the lungs through the windpipe and the pores
(d) Air enters the body and travels to the lungs through the nose and the nervous system.
Sol: (a) Air enters the body and travels to the lungs through the mouth and the nose.
19. The windpipe is also called the ________.
(a) Larynx
(b) Lungs
(c) Trachea
(d) Oesophagus
Sol: (c) Trachea.
20. In Earthworms, the process of respiration is through ________.
(a) Skin
(b) Head
(c) Lungs
(d) Pores on its anterior end
Sol: (a) Skin.
ASSERTION AND REASON QUESTIONS
Q.1. Assertion (A) : In anaerobic respiration, one of the end product is alcohol.
Reason (R) : There is an incomplete breakdown of glucose.
(a) Both A and R are true and R is the correct explanation of A.
Q.2. Assertion (A) : In plants there is no need of specialised respiratory organs.
Reason (R) : Plants do not have great demands of gaseous exchange.
(a) Both A and R are true and R is the correct explanation of A.
Q.3. Assertion (A) : Aerobic respiration requires less energy as compared to anaerobic respiration.
Reason (R) : Mitochondria is the powerhouse of the cell.
(d) A is false but R is true.
Q.4. Assertion (A): Energy is required to carry out different life processes.
Reason (R) : Energy is obtained in the form of ATP in the mitochondria.
(a) Both A and R are true and R is the correct explanation of A.
Q.5. Assertion (A): Rings of cartilage are present in the throat,
Reason (R) : These ensure that the air-passage does not collapse
(a) Both A and R are true and R is the correct explanation of A.
Q.6. Assertion (A): Pyruvate is a six-carbon molecule
Reason (R) : It is prepared in the cytoplasm as the first step to cellular respiration
(d) A is false but R is true.
Q.7. Assertion (A): Diffusion does not meet high energy requirements of multi-cellular organisms
Reason (R) : Diffusion is a fast process but occurs at the surface of the body.
(c) A is true but R is false.
Q.8. Assertion (A): In human beings, the respiratory pigment is haemoglobin
Reason (R) : It is a type of protein which has high-affinity carbon dioxide.
(c) A is true but R is false.
Q.9. Assertion : Blood takes up oxygen from the alveolar air and release CO2 during exchange.
Reason: ‘The concentration of O, is more in alveolar air.
(b) Both A and R are true but R is not the correct explanation of A.
Q.10. Assertion : Most of the living organisms carry out aerobic respiration.
Reason: Mitochondria is the site of aerobic respiration in the cell.
(b) Both A and R are true but R is not the correct explanation of A.
Q.11. Assertion: The accumulation of lactic acid in the muscles causes muscle cramps.
Reason: During vigorous physical exercise leg muscles respire anaerobically.
(a) Both A and R are true and R is the correct explanation of A.
Q.12. Assertion : Trachea does not collapse, when there is no air in it.
Reason : Trachea is supported by cartilage.
(a) Both A and R are true and R is the correct explanation of A.
