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Important Questions Test: Respiration in Organisms


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20 Questions MCQ Test Science Class 7 | Important Questions Test: Respiration in Organisms

Important Questions Test: Respiration in Organisms for Class 7 2022 is part of Science Class 7 preparation. The Important Questions Test: Respiration in Organisms questions and answers have been prepared according to the Class 7 exam syllabus.The Important Questions Test: Respiration in Organisms MCQs are made for Class 7 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Important Questions Test: Respiration in Organisms below.
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Important Questions Test: Respiration in Organisms - Question 1

Identify X in the given equation of aerobic respiration. 

Detailed Solution for Important Questions Test: Respiration in Organisms - Question 1

The given equation represents aerobic respiration. X is oxygen in the given equation.

Important Questions Test: Respiration in Organisms - Question 2

The following word equation shows a chemical process that take place in an organism Y. 

What is organism Y?

Detailed Solution for Important Questions Test: Respiration in Organisms - Question 2

The given equation represents fermentation or anaerobic respiration. In the equation T represents yeast.

Important Questions Test: Respiration in Organisms - Question 3

What will happen when diaphragm relaxes and curves upwards?

Detailed Solution for Important Questions Test: Respiration in Organisms - Question 3

When structure P (diaphragm) relaxes and curve upwards air is forced out of the lungs.

Important Questions Test: Respiration in Organisms - Question 4

The classification table given below shows how different organisms breathe.

Which of these organisms are correctly represented by X, Y and Z?   

Detailed Solution for Important Questions Test: Respiration in Organisms - Question 4

In the given table tadpole respires through gills, whale by lungs and earthworm through skin.

Important Questions Test: Respiration in Organisms - Question 5

Gas P diffuses from a capillary into an alveolus in the lungs. When is gas P expelled out from the alveolus? 

Detailed Solution for Important Questions Test: Respiration in Organisms - Question 5

In the given figure of alveolus P represents carbondioxide gas. Carbon dioxide gas is expelled out during exhalation.

Important Questions Test: Respiration in Organisms - Question 6

When we inhale, we breathe in air into the lungs. What do we breathe out when we exhale?

Detailed Solution for Important Questions Test: Respiration in Organisms - Question 6

During exhalation or expiration we breathe out air rich in carbon dioxide.

Important Questions Test: Respiration in Organisms - Question 7

What is the function of the hair in the nose?

Detailed Solution for Important Questions Test: Respiration in Organisms - Question 7

Hair traps dust particles in our nose.

Important Questions Test: Respiration in Organisms - Question 8

Identify the labelled parts P, Q and R in the figure given below. 

Detailed Solution for Important Questions Test: Respiration in Organisms - Question 8

The trachea, commonly known as the windpipe, is a tube about 4 inches long and less than an inch in diameter in most people. The trachea begins just under the larynx (voice box) and runs down behind the breastbone (sternum). The trachea then divides into two smaller tubes called bronchi: one bronchus for each lung.
The alveoli are where the lungs and the blood exchange oxygen and carbon dioxide during the process of breathing in and breathing out.
The diaphragm is an unpaired, dome shaped skeletal muscle that is located in the trunk. It separates the thoracic and abdominal cavities from each other by closing the inferior thoracic aperture. The diaphragm is the primary muscle that is active in inspiration.

Important Questions Test: Respiration in Organisms - Question 9

Which of these are the organs of human respiratory system?

Detailed Solution for Important Questions Test: Respiration in Organisms - Question 9

Trachea, bronchus and alveolus are organs of the human respiratory system.

Important Questions Test: Respiration in Organisms - Question 10

What will happen when the thin rubber sheet is pushed upwards?

Detailed Solution for Important Questions Test: Respiration in Organisms - Question 10

In the given experimental setup when the rubber sheet is pushed upwards air is forced out.

Important Questions Test: Respiration in Organisms - Question 11

What will happen when the thin rubber sheet is pulled downwards as shown in figure given below? 

Detailed Solution for Important Questions Test: Respiration in Organisms - Question 11

When rubber sheet is pulled downwards, air enters into the balloon.

Important Questions Test: Respiration in Organisms - Question 12

What is the end product of glucose in the abscence of oxygen in muscle cells?

Detailed Solution for Important Questions Test: Respiration in Organisms - Question 12

In muscle cells the end product of glucose in the absence of oxygen is lactic acid.

Important Questions Test: Respiration in Organisms - Question 13

Which of the following organisms respire through tracheal system?

Detailed Solution for Important Questions Test: Respiration in Organisms - Question 13

Tracheal respiration is found in cockroach.

Important Questions Test: Respiration in Organisms - Question 14

Why do we get, muscle cramps after heavy exercise?

Detailed Solution for Important Questions Test: Respiration in Organisms - Question 14

In muscle cells partial breakdown of glucose produces lactic acid.

Important Questions Test: Respiration in Organisms - Question 15

Which of the following statements is correct for anaerobic respiration?

Detailed Solution for Important Questions Test: Respiration in Organisms - Question 15

Food is broken down in the absence of oxygen to form alcohol, carbon dioxide and energy in anaerobic respiration.

Important Questions Test: Respiration in Organisms - Question 16

Breathing involves inspiration and expiration process. Which of the following take place during inspiration?

Detailed Solution for Important Questions Test: Respiration in Organisms - Question 16

During inspiration ribs move upward and outward.

Important Questions Test: Respiration in Organisms - Question 17

Lime water turns milky due to the presence of which of the following gases?

Detailed Solution for Important Questions Test: Respiration in Organisms - Question 17

When air is blown into the test tube containing lime water. The lime water turns milky due to CO2 gas.

Important Questions Test: Respiration in Organisms - Question 18

Which statement is correct for exhaled air and inhaled air.

Detailed Solution for Important Questions Test: Respiration in Organisms - Question 18

The exhaled air contains less oxygen and more carbon dioxide than the inhaled air.

The typical composition of exhaled air is about 18% O2, 78% N2, and 4.0% CO2.

Important Questions Test: Respiration in Organisms - Question 19

Which of these are parts of the human respiratory system?

(i) Mouth

(ii) Nostrils

(iii) Gullet

(iv) Windpipe

(v) Lungs

Detailed Solution for Important Questions Test: Respiration in Organisms - Question 19

Nostrils, windpipe and lungs are the respiratory organs.

Important Questions Test: Respiration in Organisms - Question 20

What happens when we breathe in?

(i) Size of our chest increases.

(ii)  Size of our chest decreases.

(iii) Carbon dioxide is removed from our body

(iv) Air enters our lungs.

Detailed Solution for Important Questions Test: Respiration in Organisms - Question 20

When we breathe in air. Air enters lungs and there is an increase in the size of the chest.

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