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प्रश्न
A candidate studied the importance of certain factors in photosynthesis. He took a potted plant and kept in the dark for over 24 hours. In the early hours of the next morning, he covered one of the leaves with black paper in the centre only. Then he placed the plant in sunlight for a few hours and tested the leaf which was covered with black paper for starch.
Why was the plant kept in the dark before the experiment?
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उत्तर
Destarching ensures that any starch present after the experiment has been formed under experimental conditions. Therefore, the plant was kept in the dark before the experiment.
संबंधित प्रश्न
Identify the odd one in each set : Transpiration, Photosynthesis, Phagocytosis, Guttation
The diagram given below represents an experiment to prove the importance of a factor in photosynthesis. Answer the questions that follow:
- Name the factor studied in this experiment.
- What will you observe in the experimental leaf after the starch test?
- Explain the process of photosynthesis.
- Give a balanced chemical equation to represent the process of photosynthesis.
- Draw a neat, labelled diagram of an experimental setup to show that oxygen is released during photosynthesis.
Identify the false statement and rewrite it correctly by changing the first or last word only.
Green plants are consumers.
Photosynthesis in green plants is directly and indirectly dependent on so many plant structures.
Explain briefly the role of the following structures in this process is Phloem tissue in the leaf veins.
All life on earth Would come to an end if there were no green plants.
Name the following:
The immediate product of photosynthesis.
Choose the Odd One Out
State whether true or false. If false, correct the statement.
When the weather is hot, water evaporates lesser which is due to opening of stomata.
Which gas evolved during photosynthesis?
Study the diagram given below and fill in the blanks with suitable words:
In order to prove that carbon dioxide is necessary for
(a) ______, a potted plant is placed in dark for 48 hours to (b) ______ the leaves. A part of a leaf is inserted into a conical flask containing potassium hydroxide solution. This is to absorb (c) ______ from the flask. The plant is then placed in sunlight for a few hours. The experimental leaf is tested for starch. The part of the leaf that was inside the conical flask turns (d) ______, whereas the part of the left outside turns (e) ______ in colour.
