Match the following: Column A Column B (1) Opening of the trachea (a) Muscle fatigue (2) Moist skin (b) Oxygen from soil (3) Lactic acid (c) Old stem (4) Lenticel (d) Spiracle (5) Gills (e) Cutaneous respiration (6) Root hair (f) Oxygen from water

1 - d Cockroaches breathe with the help of the trachea and spiracles. The oxygen-rich air enters into the tracheal tubes via the openings present on their body surface called spiracles. 2 - e The skin of the frogs is moist, which helps in the diffusion of gases from the surrounding atmosphere into the blood capillaries. It is known as cutaneous respiration. 3 - a Under normal conditions, our muscles break down glucose to produce energy. However, in the absence of oxygen, during heavy exercise, the glucose breaks down to give lactic acid, carbon dioxide and a small amount of energy. This leads to muscle cramp and muscle fatigue. 4 - c The old woody stems of trees have lenticels present below their bark, which helps in the exchange of gases. 5 - f The animals which live underwater cannot obtain oxygen directly from the atmosphere. Instead, they have gills to obtain oxygen in the dissolved form from the water. 6 - b The roots of the plants have root hairs that extend into air spaces present between the soil particles to absorb oxygen. Column A Column B (1) Opening of trachea (d) Spiracle (2) Moist skin (e) Cutaneous respiration (3) Lactic acid (a) Muscle fatigue (4) Lenticel (c) Old stem (5) Gills (f) Oxygen from water (6) Root hair (b) Oxygen from soil

E M B I B E

Science Booster>Chapter 11 - Respiration in Animals and Plants>Check Point 3>Q 4

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Tiny pores on the surface of leaves are called stomata.

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Important Questions on Respiration in Animals and Plants

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7th CBSE

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Science Booster>Chapter 11 - Respiration in Animals and Plants>Check Point 3>Q 5

Old woody stems respire through bark.

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Science Booster>Chapter 11 - Respiration in Animals and Plants>PRACTICE TIME>Q A

During inhalation, diaphragm

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Science Booster>Chapter 11 - Respiration in Animals and Plants>PRACTICE TIME>Q A

Which of the following is not associated with respiration?

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Science Booster>Chapter 11 - Respiration in Animals and Plants>PRACTICE TIME>Q A

Exhaled air contains more

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7th CBSE

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Science Booster>Chapter 11 - Respiration in Animals and Plants>PRACTICE TIME>Q A

The breathing rate in humans under normal conditions is

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Science Booster>Chapter 11 - Respiration in Animals and Plants>PRACTICE TIME>Q A

Which of the following respire(s) only anaerobically?

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Science Booster>Chapter 11 - Respiration in Animals and Plants>PRACTICE TIME>Q A

Exchange of gases in lungs between air and blood is called

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Science Booster>Chapter 11 - Respiration in Animals and Plants>PRACTICE TIME>Q B

Match the following:

Column A	Column B
(1) Opening of the trachea	(a) Muscle fatigue
(2) Moist skin	(b) Oxygen from soil
(3) Lactic acid	(c) Old stem
(4) Lenticel	(d) Spiracle
(5) Gills	(e) Cutaneous respiration
(6) Root hair	(f) Oxygen from water

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