CBSE Class 10 Science Biology Respiration Assignment Set A

Question. Which of the following is the correct sequence of air passage during inhalation ?
(a) nostrils → larynx → pharynx → trachea → lungs
(b) nasal passage → trachea → pharynx → larynx → alveoli
(c) larynx → nostrils → pharynx → lungs
(d) nostrils → pharynx → larynx → trachea → alevoli

Answer : D

Question. Lack of oxygen in muscles often leads to cramps in the legs of sprinters. This is due to conversion of pyruvate to :
(a) ethanol
(b) carbon dioxide
(c) acetic acid
(d) lactic acid

Answer : D

Question. In cockroaches, air enters the body through :
(a) lungs
(b) gills
(c) spiracles
(d) skin

Answer : C

Question. Which of the following is most likely to have a much higher breathing rate ?
(a) man
(b) fish
(c) dog
(d) sparrow

Answer : B

Question. During the deficiency of oxygen in tissues of human beings, pyruvic acid is converted into lactic acid in :
(a) cytoplasm
(b) chloroplast
(c) mitochondria
(d) golgi body

Answer : A

Question. Which of the following statements are correct ?
(i) pyruvate can be converted into ethanol and carbon dioxide by yeast
(ii) fermentation takes place in the case of aerobic bacteria
(iii) fermentation takes place in mitochondria
(iv) fermentation is a form of anaerobic respiration
(a) (i) and (iii)
(b) (ii) and (iv)
(c) (i) and (iv)
(d) (ii) and (iii)

Answer : C

Question. Which of the following increases in muscle cells when they are lacking in oxygen ?
(a) carbon dioxide
(b) lactose
(c) lactic acid
(d) uric acid

Answer : C

Question. Internal respiration may be defined as :
(a) breathing in and releasing of oxygen in the tissue
(b) the oxidation of food substances to release energy
(c) the building up (synthesis) of complex substances
(d) getting rid of carbon dixode that would accumulate in the tissues.

Answer : B

Question. The photosynthesis in a plant is not taking place during the day time if the plant is releasing :
(a) water vapour
(b) oxygen
(c) carbon dioxide
(d) all the above

Answer : C

Question. The breathing and respiration in woody stem of a plant takes place through :
(a) root hair
(b) lenticels
(c) closed stomata
(d) open stomata

Answer : B

Question. One of the following organism does not depend on simple diffusion of gases for breathing and respiration.
This organism is :
(a) Amoeba
(b) Prawn
(c) Planaria
(d) Bryophyllum

Answer : B

Question. During marathon, we sometimes get painful contractions of leg muscles due to the accumulation of one of the following in leg muscles. This is :
(a) carbon dioxide
(b) alcohol
(c) lactose
(d) lactic acid

Answer : D

Questions Based on High Order Thinking Skills (HOTS)

Question. During the respiration of an organism A, 1 molecule of glucose produces 2 ATP molecules whereas in the respiration of another organism B, 1 molecule of glucose produces 38 ATP molecules.

(a) Which organism is undergoing aerobic respiration ?
Answer : B

(b) Which organism is undergoing anaerobic respiration ?
Answer : A

(c) Which type of organism, A or B, can convert glucose into alcohol ?
Answer : A

(d) Name one organism which behaves like A.
Answer : Yeast 

(e) Name two organisms which behave like B.
Answer : Man, Dog

Question. A, B and C are three living organisms. The organism A is a unicellullar fungus which can live without air.
It is used in the commercial production of an organic compound P from molasses. The organism B is a  unicellular animal which lives in water and feeds and moves by using pseudopodia. It breathes through an organelle Q. The organism C is a tiny animal which acts as a carrier of malarial parasite. It breathes and respires through a kind of tiny holes R and air-tubes S in its body.

(a) What are organisms (i) A (ii) B, and (iii) C ?
Answer : (i) Yeast (ii) Amoeba (iii) Mosquito

(b) Name (i) P (ii) Q (iii) R, and (iv) S.
Answer : (i) Ethanol (ii) Cell membrane (iii) Spiracles (iv) Tracheae

(c) Which organism/organisms undergo aerobic respiration ?
Answer : B and C

(d) Which organism/organisms undergo anaerobic respiration ?
Answer : A

Question : 1 Name the intermediate and the end product of glucose break down in aerobic respiration

Question : 2 a) Draw the respiratory system of human beings
b) Label the following in the diagram drawn Larynx , Trachea , Primary bronchus , Lungs
c ) What happens to the carbon dioxide which collect in the human tissues ? 

Question : 3 Why is the rate of breathing in aquatic organisms much faster than that seen in terrestrial organisms? How does oxygenation of blood takes place in fish?