• Respiration in Organisms (Class VII)
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Respiration in Organisms (Class VII)

Description: Aerobic Anaerobic Mechanism of respiration
Number of Questions: 15
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Tags: Aerobic Anaerobic Mechanism of respiration Arithmetic Mean of Data Meaning of Chance and Probability Mode of Data Interpreting Bar Graphs Range of Given Data Median of Data Respiration and its Types Exchange of Gases in Humans Role of Breathing and its Mechanism Breathing in Other Animals and Plants
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In which of the following cell organelles does cell respiration happen?

  1. Nucleus

  2. Mitochondria

  3. Ribosomes

  4. Vacuoles

  5. Chromoplast

Show answer
Correct Option: B
Explanation:

Yes, it is correct. Respiration happens inside a cell in mitochondria. Hence, it is known as cellular respiration. Mitochondria releases food energy. Hence, it is known as 'powerhouse' of the cell.

Which of the following events does not occur during anaerobic respiration in muscles?

  1. Breakdown of glucose

  2. Formation of alcohol

  3. Release of energy

  4. Formation of lactic acid

  5. None of these

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Correct Option: B
Explanation:

Yes, it is correct. During anaerobic respiration in microbes, alcohol is formed. But lactic acid is the end product when anaerobic respiration takes place in our muscles.

Which of the following organisms has/have lungs like human beings?

  1. Cockroach

  2. Amoeba

  3. Earthworm

  4. Frog

  5. All of the above

Show answer
Correct Option: D
Explanation:

Yes, it is correct. Frogs have lungs, just like human beings.

The network of hollow tubes running throughout the body of insects helps them in respiration. Each tube has an opening on the body surface in the form of a very small pore, called

  1. trachea

  2. spiracle

  3. gill

  4. stomata

  5. None of these

Show answer
Correct Option: B
Explanation:

Yes, it is correct. Each trachea opens on the body surface in the form of a very small pore. These pores are called spiracles.

Why does a man at rest breathe at a slower rate as compared to a man running?

  1. The organs of a man at rest are also at rest. Hence, breathing is also slow.

  2. As he is resting, he is not aware of breathing.

  3. A man at rest has low energy as compared to a man who is running and hence, he cannot exhale and inhale quickly.

  4. A man, who is sleeping, does not require more of oxygen. Hence, he breathes at a normal rate.

  5. None of these

Show answer
Correct Option: D
Explanation:

Yes, it is correct. The rate of breathing increases when we do strenuous physical work like running. But when we are at rest, our breathing is normal.

When air is blown in a glass full of limewater by a drinking straw and stirred, then

  1. carbon dioxide is released

  2. limewater turns milky

  3. calcium carbonate is formed

  4. Both 1 and 2

  5. 1, 2 and 3

Show answer
Correct Option: E
Explanation:

Yes, on blowing air in a glass full of limewater through a drinking straw, it is observed that the limewater turns milky. This shows that carbon dioxide is released during exhalation.

Which of the following statements regarding exhalation process in human beings is correct?

  1. Air moves out, rib cage moves out and diaphragm moves down.

  2. Air moves out, rib cage moves in and diaphragm moves up.

  3. Air moves in, rib cage moves out and diaphragm moves down.

  4. Air moves in, rib cage moves in and diaphragm moves up.

  5. None of these

Show answer
Correct Option: B
Explanation:

Yes, it is correct. When the diaphragm moves up, the rib cage moves in and air is exhaled.

Which of the following is the main end product of anaerobic respiration in microbes?

  1. Lactic acid

  2. Oxygen

  3. Alcohol

  4. Water

  5. None of these

Show answer
Correct Option: C
Explanation:

Yes, it is correct. Alcohol and carbon dioxide are formed at the end of anaerobic respiration.

Breathing rate can be calculated by

  1. counting the number of inhales in a minute

  2. counting the number of exhales in a minute

  3. counting the number of inhales and exhales in a minute

  4. the amount of glucose oxidised per minute

  5. None of these

Show answer
Correct Option: C
Explanation:

Yes, it is correct. The number of times a person inhales and exhales in a minute is the breathing rate. A complete breath is inhaling and exhaling once.

Which of the following statements regarding respiration is true?

  1. Water is used during respiration.

  2. Water is released during aerobic respiration.

  3. Water is released when respiration happens in human muscles.

  4. Water is released when microbes respire.

  5. None of these

Show answer
Correct Option: B
Explanation:

Yes, it is correct. In aerobic respiration, carbon dioxide and water are the end products.

The pneumatophores, modified roots grow

  1. into the soil like fingers

  2. deep into the soil

  3. hanging from the branches of trees downward

  4. upward out of the water or mud

  5. None of these

Show answer
Correct Option: D
Explanation:

Yes, it is correct. Pneumatophores are specialised root that grows upwards out of the water or mud to reach the air and obtain oxygen for the root systems of trees that live in swampy or tidal habitats.

Oxygen is produced in plants by

  1. photosynthesis

  2. anaerobic respiration

  3. aerobic respiration

  4. transpiration

  5. None of these

Show answer
Correct Option: A
Explanation:

Yes, it is correct. By using the energy of sunlight, plants convert carbon dioxide and water into carbohydrates and oxygen during photosynthesis.

If too much water is filled in a field, then the plants die because

  1. plants do not get sunlight

  2. plants do not get oxygen

  3. plant manures get diluted

  4. plant stems get weakened

  5. All of the above

Show answer
Correct Option: B
Explanation:

Yes, it is correct. The air spaces in the soil is replaced with water and due to lack of oxygen, the plants die.

Match the following:

     
1. Roots a. Epidermis
2. Stems b. Stomata
3. Leaves c. Hairs

  1. 1 - b, 2 - a, 3 - c

  2. 1 - a, 2 - c, 3 - b

  3. 1 - c, 2 - b, 3 - a

  4. 1 - c, 2 - a, 3 - b

  5. None of these

Show answer
Correct Option: D
Explanation:

Yes, it is correct. Here, all are correctly matched. Each plant part breathes through its external layer of cells. Roots breathe through root hairs. Stems breathe through epidermis. Leaves have small pores called stomata for breathing.

Match the following:

     
1. Trees growing in mangroves a. Lungs of the world
2. Large forests b. Exchange of gases
3. Lenticles c. Pneumatophores

  1. 1 - b, 2 - a, 3 - c

  2. 1 - c, 2 - a, 3 - b

  3. 1 - c, 2 - b, 3 - a

  4. 1 - a, 2 - c, 3 - b

  5. None of these

Show answer
Correct Option: B
Explanation:

Yes, it is correct. All are matched correctly. Trees growing in mangroves have modified roots called as pneumatophores. Large forests are called as lungs of the world. Lenticles are loosely arranged cells for the exchange of gases.

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