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प्रश्न
Why is it not possible to demonstrate respiration in a green plant kept in sunlight?
Give reasons/explain:
It is not possible to demonstrate respiration in a green plant kept in sunlight.
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उत्तर १
If a green plant is kept in bright light, it tends to use up all the CO2 produced during respiration for photosynthesis. Thus, the release of CO2 cannot be demonstrated. Hence, it is difficult to demonstrate respiration as these two processes occur simultaneously.
उत्तर २
When a plant is kept in sunlight, CO2 released by respiration gets used by photosynthesis to synthesise food. So no carbon dioxide is liberated, and respiration cannot be demonstrated.
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संबंधित प्रश्न
Fill in the blank:
Land plants obtain their carbon dioxide from the ______.
A potted plant was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours. One of the leaves was covered with black paper in the centre. The potted plant was then placed in sunlight for a few hours.
What aspect of photosynthesis was being tested?
The diagram below shows two test-tubes A and B. Test-tube A contains a green water plant. Test-tube B contains both a green water plant and a snail. Both test-tubes are kept in sunlight. Answer the questions that follow:
(a) Name the physiological process that releases the bubbles of oxygen.
(b) Explain the physiological process as mentioned above in (a).
(c) What is the purpose of keeping a snail in test-tube B?
(d) Why does test-tube B have more bubbles of oxygen?
(e) Give an example of a water plant that can be used in the above experiment.
(f) Write the overall chemical equation for the above process.
Give technical term:
Name only one plant, you are familiar with which has no chlorophyll.
Choose the Odd One Out
Choose the Correct Answer:
The main difference between chlorophyll ‘a’ and ‘b’ is:
Write the overall chemical equation for photosynthesis.
Give reasons/explain:
During the starch test, the leaf is boiled in methylated spirit.
Given below is the diagram of an experimental set-up (final stage). Study the same and answer the following questions:
- What is the main aim of the experiment?
- Oxygen gas shown in the experiment is released from which of the raw materials?
- How would you confirm the presence of oxygen gas?
- Name the chemical substance which can be added in water to enhance the process/rate of release of oxygen gas.
- Draw a neat and labelled diagram of the same experiment for its initial stage.
