With the help of an experiment demonstrate that CO 2 is given out in breathing.

Aim: To prove that carbon dioxide is released during breathing. Requirements: Conical flask, a beaker, a cork with a hole, a glass tube bent at right angles at two places, a small test tube, KOH solution, thread, coloured water, vaseline and germinating seeds of gram or pea. Theory: Respiration is a catabolic process. In this process, the oxidation of complex organic molecules into simpler compounds with the release of energy. This process can occur aerobically and anaerobically. The reaction mechanism of aerobic respiration involves the complete oxidation of carbohydrates. C 6 H 12 O 6 + 6O 2 → 6CO 2 + 6H 2 O + Energy Diagram of the experiment: Procedure: 1. Take the conical flask and put some germinating seeds in it. 2. Insert the shorter end of the glass tube through the hole in the cork and fix it on the conical flask. 3. Hang a test tube containing KOH solution inside the conical flask with the help of a thread. 4. Take coloured water in the beaker and keep the longer end of the glass tube dipped inside it. 5. Make the conical flask airtight by applying vaseline on its rim. Now note the initial level of water in the tube. 6. Observe and note the rise in the water level after an hour, without disturbing the apparatus. Observation: Water level rises in the bent tube. Result: The rise in the level of water indicates that CO2 is produced by germinating seeds during respiration. The germinating seeds respire and produce CO2, which is absorbed by KOH solution due to this creates a vacuum in the conical flask. The air present in the bent glass tube moves into the conical flask and pulls the water in the bent tube further up.

E M B I B E

CORE SCIENCE BIOLOGY For Class 10>Chapter 1 - Life Processes>EXERCISE - 1B>Q 19

MEDIUM

10th CBSE

IMPORTANT

Earn 100

Explain the process of the breakdown of glucose in a cell:
(i) in the presence of oxygen
(ii) in the absence of oxygen.

Important Questions on Life Processes

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10th CBSE

IMPORTANT

CORE SCIENCE BIOLOGY For Class 10>Chapter 1 - Life Processes>EXERCISE - 1B>Q 1

How is oxygen and carbon dioxide transported in human beings?

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10th CBSE

IMPORTANT

CORE SCIENCE BIOLOGY For Class 10>Chapter 1 - Life Processes>EXERCISE - 1B>Q 2

With the help of an experiment demonstrate the mechanism of breathing.

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10th CBSE

IMPORTANT

CORE SCIENCE BIOLOGY For Class 10>Chapter 1 - Life Processes>EXERCISE - 1B>Q 4

What is the function of epiglottis in man? Draw a labeled diagram showing the human respiratory system.

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10th CBSE

IMPORTANT

CORE SCIENCE BIOLOGY For Class 10>Chapter 1 - Life Processes>EXERCISE - 1B>Q 5

With the help of an experiment demonstrate that CO₂ is given out in breathing.

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10th CBSE

IMPORTANT

CORE SCIENCE BIOLOGY For Class 10>Chapter 1 - Life Processes>EXERCISE - 1B>Q 6

How is respiration different from breathing? Explain the processes of 'aerobic' respiration and 'anaerobic' respiration.

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10th CBSE

IMPORTANT

CORE SCIENCE BIOLOGY For Class 10>Chapter 1 - Life Processes>EXERCISE - 1B>Q 7

Draw a diagram showing human respiratory system. Label its following parts: (i) Larynx (ii) Trachea (iii) Primary Bronchus (iv) Lungs.
Why do the walls of the trachea not collapse when there is less air in it?

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10th CBSE

IMPORTANT

CORE SCIENCE BIOLOGY For Class 10>Chapter 1 - Life Processes>EXERCISE - 1B>Q 8

Draw a labeled diagram of the respiratory system of human beings with diaphragm at the end of expiration.

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10th CBSE

IMPORTANT

CORE SCIENCE BIOLOGY For Class 10>Chapter 1 - Life Processes>EXERCISE - 1B>Q 8

List four conditions required for efficient gas exchange in an organism?