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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.
Describe step by step, how the candidate proceeded to test the leaf for the presence of starch?
उत्तर
- The student dipped the leaf in boiling water for a minute to kill the cells.
- Then he boiled the leaf in alcohol/methylated spirit over a water bath to remove chlorophyll. The leaf becomes hard and brittle.
- He then places the leaf in hot water to soften it.
- Next the student spreads the leaf in a dish and pours iodine solution on it. The presence of starch is indicated by a blue-black colour.
- The uncovered portion (exposed to sunlight) turned blue-black colour and the covered portion showed brown colour. The difference in the colours of covered and uncovered part of leaves indicates the importance of sunlight in photosynthesis.
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संबंधित प्रश्न
The diagram given below represents an experiment to prove the importance of a factor in photosynthesis. Answer the questions that follow : 
Draw a neat, labelled diagram of an experimental steup to show that oxygen is released during photosynthesis
The following statement is about photosynthesis in a green plant. Write whether it is True or False.
A variegated leaf (one that has white as well as green patches) will only photosynthesize in the green areas.
Fill in the blank:
CO2 enters the leaf through ______.
Choose the correct answer:
In a typical leaf, photosynthesis occurs mainly in ___________
The production of starch, and not glucose, is often used as a measure of photosynthesis in leaves because
Are the following statement true or false? Give a reason in support of your answer.
The rate of photosynthesis continues to rise as long as the intensity of light rises.
How do non-green plants such as fungi and bacteria obtain their nourishment?
Explain the Term ATP.
Explain the term Phosphorylation.
Give technical term:
The part of the chloroplast where the dark reaction of photosynthesis takes place.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Radiant energy is converted into chemical energy by photosynthesis.
Write the functional activity of the following structure:
Granum
Write the functional activity of the following structure:
Chloroplasts
Choose the Correct Answer:
Which would do maximum harm to a tree?
Fill in the blank by rearranging the letter in the bracket.
During photosynthesis plants releases _________ (egxyno).
Where does the carbon that is used in photosynthesis come from?
Plants may inhale carbon dioxide for photosynthesis but need ______ for their living.
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.
Given below are groups of terms. The first pair indicates the relationship between the two terms. Complete the second pair accordingly.
Producers : Autotrophs : : Consumers : ______
