Match the items in Column I with those in Column II: Column I Column II a. Yeast i. Earthworm b. Diaphragm ii. Gills c. Skin iii. Alcohol d. Leaves iv. Chest cavity e. Fish v. Stomata f. Frog vi. Lungs and skin g. Cockroach vii. Tracheae

a- iii Yeast is a unicellular organism used in alcohol production. Yeast is also known as anaerobes as they perform anaerobic respiration in absence of oxygen. b- iv The diaphragm is a thin skeletal muscle that separates the chest cavity, containing the heart and lungs, from the abdominal cavity. c- i The earthworm respires through its moist skin. The skin of an earthworm feels moist and slimy due to the presence of mucus, which allows gasses to pass through it. d- v The stomata are small openings present on the leaves. It helps in the process of transpiration as well as in the exchange of gasses. The pores of the stomata are surrounded by a special type of cells called the guard cells. e- ii Fishes are aquatic animals and breathe through their gills. Gills are well supplied with blood vessels that help in the exchange of gases. f- vi Frogs breathe through both lungs and skin. Frogs are known as amphibians as they can live both in water, and on land. In water, frogs breathe through their skin, and when on land, they use their lungs for breathing. g- vii Cockroaches are insects that breathe through a network of tubes called the trachea. The trachea helps in the exchange of gases and opens on the exoskeleton through the spiracles. The trachea supplies oxygen from air directly to the tissues. Column I Column II a. Yeast i. Alcohol b. Diaphragm ii. Chest cavity c. Skin iii. Earthworm d. Leaves iv. Stomata e. Fish v. Gills f. Frog vi. Lungs and skin g. Cockroach vii. Trachea

E M B I B E

SCIENCE A TEXTBOOK FOR CLASS 7>Chapter 10 - Respiration in Organisms>EXERCISES>Q 4

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7th Jammu and Kashmir Board

IMPORTANT

Earn 100

Why do we often sneeze when we inhale a lot of dust-laden air?

Important Questions on Respiration in Organisms

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7th Jammu and Kashmir Board

IMPORTANT

SCIENCE A TEXTBOOK FOR CLASS 7>Chapter 10 - Respiration in Organisms>EXERCISES>Q 5

Take three test-tubes. Fill 3/4^th of each with water. Label them A, B and C. Keep a snail in test-tube A, a water plant in test-tube B and in C, keep snail and plant both. Which test-tube would have the highest concentration of CO₂?

EASY

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IMPORTANT

SCIENCE A TEXTBOOK FOR CLASS 7>Chapter 10 - Respiration in Organisms>EXERCISES>Q 6

In cockroaches, air enters the body through

EASY

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IMPORTANT

SCIENCE A TEXTBOOK FOR CLASS 7>Chapter 10 - Respiration in Organisms>EXERCISES>Q 6

During heavy exercise, we get cramps in the legs due to the accumulation of

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IMPORTANT

SCIENCE A TEXTBOOK FOR CLASS 7>Chapter 10 - Respiration in Organisms>EXERCISES>Q 6

Normal range of breathing rate per minute in an average adult person at rest is

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7th Jammu and Kashmir Board

IMPORTANT

SCIENCE A TEXTBOOK FOR CLASS 7>Chapter 10 - Respiration in Organisms>EXERCISES>Q 6

During exhalation, the ribs

HARD

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IMPORTANT

SCIENCE A TEXTBOOK FOR CLASS 7>Chapter 10 - Respiration in Organisms>EXERCISES>Q 7

Match the items in Column I with those in Column II:

Column I	Column II
a. Yeast	i. Earthworm
b. Diaphragm	ii. Gills
c. Skin	iii. Alcohol
d. Leaves	iv. Chest cavity
e. Fish	v. Stomata
f. Frog	vi. Lungs and skin
g. Cockroach	vii. Tracheae