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BiologyClass 10ICSE

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

(c) spiracles In insects, tiny pores are present on the body called spiracles. Air enters the body through these pores.

BiologyClass 10ICSE

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

lactic acid The anaerobic respiration by the muscles brings about a partial breakdown of glucose to form lactic acid.

BiologyClass 10ICSE

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

(b) Prawn Prawn is an aquatic animal that respires through gills, other organisms depend on diffusion of gases for breathing.

BiologyClass 10ICSE

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

(b) lenticels In woody stems, the bark (outer covering of the stem) has lenticels for gaseous exchange.

BiologyClass 10ICSE

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

carbon dioxide During daytime, the carbon dioxide produced through respiration is used up in photosynthesis by leaves. So carbon dioxide is not released during day time.

BiologyClass 10ICSE

In one of the following organisms, the gaseous exchange during respiration does not take place through cell membrane/skin. This organism is: (a) Electric eel (b) Leech (c) Earthworm (d) Amoeba

Electric eel Electric eel is the organism in which the gaseous exchange during respiration occurs through mouth.

BiologyClass 10ICSE

One of the following organisms can live without oxygen of air. This organism is: (a) Amoeba (b) Yak (c) Yeast (d) Leech

(c) Yeast Yeast can live without the oxygen present in the air as it undergoes anaerobic respiration.

BiologyClass 10ICSE

One of the following animals does not use tracheae as the respiratory organs. This animal is: (a) grasshopper (b) prawn (c) mosquito (d) cockroach

prawn Prawn is an aquatic animal that respires through gills. Insects breathe through tracheae.

BiologyClass 10ICSE

The two organisms which breath only through their moist skin are: (a) fish and frog (b) frog and earthworm (c) leech and earthworm (d) fish and earthworm

(c) leech and earthworm Leech and earthworm breathe only through their moist skin. Other organisms given here breathe through lungs and skin.

BiologyClass 10ICSE

Which of the following is known as the energy currency of the cells in biology? (a) DTP (b) PDP (c) ATP (d) DDT

(c) ATP ATP stores energy in the cell. Hence, it is known as currency of cells in biology.

BiologyClass 10ICSE

Which of the following statements are true about respiration? (i) During inhalation, ribs move inward and diaphragm is raised. (ii) The gaseous exchange takes place in the alveoli. (iii) Hemoglobin has a greater affinity for carbon dioxide than oxygen. (iv) Alveoli increase the surface area of the exchange of gases (a) (i) and (iv) (b) (ii) and (iii) (c) (i) and (iii) (d) (ii) and (iv)

(ii) and (iv) Alveoli are the tiny air sacs that help in the exchange of gases. These are connected to tiny blood capillaries. They also increase the surface area of gases in order to ease the process of the exchange of gases.

BiologyClass 10ICSE

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)

(i) and (iv) Fermentation takes place in the case of anaerobic bacteria and also in cytoplasm.

BiologyClass 10ICSE

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

cytoplasm Pyruvic acid is converted into lactic acid in cytoplasm in absence or deficiency of oxygen.

BiologyClass 10ICSE

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

lactic acid Lack of oxygen in muscles causes accumulation of lactic acid, due to anaerobic respiration. Accumulation of lactic acid leads to cramps in the legs of sprinters.

BiologyClass 10ICSE

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 → alveoli

Nostrils → pharynx → larynx → trachea → alveoli The total sequence of air passage during inhalation is as follows: Nostrils → Nasal chambers → Pharynx → Larynx → Trachea → Bronchi → Bronchioles → Alveoli

BiologyClass 10ICSE

When air is blown from mouth into a test-tube containing lime water, the lime water turns milky due to the presence of: (a) oxygen (b) carbon dioxide (c) nitrogen (d) water vapor

carbon dioxide Lime water turns milky due to the presence of carbon dioxide in the exhaled air.

BiologyClass 10ICSE

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 dioxide that would accumulate in the tissues.

(b) The oxidation of food substances to release energy Internal respiration may be defined as the oxidation of food substances to release energy.

BiologyClass 10ICSE

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

lactic acid This is because, here, anaerobic respiration takes place in which glucose is converted into lactic acid.

BiologyClass 10ICSE

Which of the following is correct for the process of anaerobic respiration? Carbon dioxide always produced A lot of energy released (a) No Yes (b) No No (c) Yes No (d) Yes Yes

No No There are two pathways through which anaerobic respiration occurs. In micro-organisms such as yeast, and in muscles during heavy physical exercise. Carbon dioxide is not released during process.

BiologyClass 10ICSE

• In one of the following organisms, the gaseous exchange during respiration does not take place through cell membrane/skin. This organism is: (a) Electric eel (b) Leech (c) Earthworm (d) Amoeba

Electric eel Electric eel is the organism in which the gaseous exchange during respiration occurs through mouth.

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