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

Given below is a square of letters in which are hidden words related to respiration organism. These words may be present in any direction upwards, downwards, or along the diagonals. Find the words for your respiratory system. Clues about those words are given below the square. (i) The air tubes of insects. (ii) Skeletal structures surrounding a chest cavity. (iii) The muscular floor of the chest cavity. (iv) Tiny pores on the surface of a leaf. (v) Small opening on the sides of the body of an insect. (vi) The respiratory organs of human beings. (vii) The opening through which we inhale. (viii) An anaerobic organism.

The names of the organs of the respiratory system are given below: (i) The air tubes of insects - Trachea. Insects have spiracles, that are openings on exoskeletons to allow air to enter the trachea. These are connected to tracheal tubes that deliver oxygen directly into the tissues of insects. (ii) Skeletal structures surrounding a chest cavity - Ribs. It protects the internal organs such as heart from mechanical shock and injury. (iii) The muscular floor of the chest cavity - Diaphragm. (iv) Tiny pores on the surface of a leaf - Stomata. Stomata help in transpiration process. (v) Small opening on the sides of the body of an insect - Spiracles. These are connected to tracheal tubes that deliver oxygen directly into the tissues of insects. (vi) The respiratory organs of human beings - Lungs. Except for this nose, pharynx, larynx, trachea, bronchi, lungs, and diaphragm are also play an important role. (vii) The opening through which we inhale - Nostrils. (viii) An anaerobic organism - Yeast. They can produce alcohol by the process of fermentation.

E M B I B E

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

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

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Important Questions on Respiration in Organisms

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

During exhalation, the ribs

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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

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SCIENCE A TEXTBOOK FOR CLASS 7>Chapter 10 - Respiration in Organisms>EXERCISES>Q 8

During heavy exercise the breathing rate of a person slows down.

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SCIENCE A TEXTBOOK FOR CLASS 7>Chapter 10 - Respiration in Organisms>EXERCISES>Q 8

Plants carry out photosynthesis only during the day and respiration only at night.

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SCIENCE A TEXTBOOK FOR CLASS 7>Chapter 10 - Respiration in Organisms>EXERCISES>Q 8

Frogs breathe through their skins as well as their lungs.

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SCIENCE A TEXTBOOK FOR CLASS 7>Chapter 10 - Respiration in Organisms>EXERCISES>Q 8

The fishes perform respiration through gills.

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SCIENCE A TEXTBOOK FOR CLASS 7>Chapter 10 - Respiration in Organisms>EXERCISES>Q 8

The size of the chest cavity increases during inhalation.

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SCIENCE A TEXTBOOK FOR CLASS 7>Chapter 10 - Respiration in Organisms>EXERCISES>Q 9

Given below is a square of letters in which are hidden words related to respiration organism. These words may be present in any direction upwards, downwards, or along the diagonals. Find the words for your respiratory system. Clues about those words are given below the square.

Question Image

(i) The air tubes of insects.
(ii) Skeletal structures surrounding a chest cavity.
(iii) The muscular floor of the chest cavity.
(iv) Tiny pores on the surface of a leaf.
(v) Small opening on the sides of the body of an insect.
(vi) The respiratory organs of human beings.
(vii) The opening through which we inhale.
(viii) An anaerobic organism.

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