Ques. => Activity to show that chlorophyll is present in leaves.
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1. We take a potted plant like croton whose leaves are partly green and partly white. The green part of the leaf has chlorophyll but the white part of the leaf does not have chlorophyll.
2. Place this plant in a completely dark place for about three days to destarch its leaves.
3. Take out the potted plant from the dark place and keep it in bright sunshine for three to four days.
4. Pluck the variegated leaf from the plant, boil it in water for a few minutes and then remove its green colour 'chlorophyll' by boiling it in alcohol. The green parts of the leaf get decolourised. So, we get decolourised leaf.
5. Wash the decolourised leaf with hot water to soften it and remove any chlorophyll which may be sticking to it.
6. Pour iodine solution over the colourless leaf and observe the change in colour of the leaf.
7. We will find that the outer part of leaf that was originally white (without chlorophyll) does not turn blue-black on adding iodine solution showing that no starch is present in this outer part of the leaf. From this observation we conclude that the photosynthesis to make starch does not take place without chlorophyll.
8. The inner part of leaf which was originally green (contained chlorophyll) turns blue-black on adding iodine solution showing that starch is present in this inner part of the leaf. From this observation we conclude that the photosynthesis to make starch takes place in the presence of chlorophyll. In other words, chlorophyll is necessary for the process of photosynthesis to take place.
Hope it helps you...
2. Place this plant in a completely dark place for about three days to destarch its leaves.
3. Take out the potted plant from the dark place and keep it in bright sunshine for three to four days.
4. Pluck the variegated leaf from the plant, boil it in water for a few minutes and then remove its green colour 'chlorophyll' by boiling it in alcohol. The green parts of the leaf get decolourised. So, we get decolourised leaf.
5. Wash the decolourised leaf with hot water to soften it and remove any chlorophyll which may be sticking to it.
6. Pour iodine solution over the colourless leaf and observe the change in colour of the leaf.
7. We will find that the outer part of leaf that was originally white (without chlorophyll) does not turn blue-black on adding iodine solution showing that no starch is present in this outer part of the leaf. From this observation we conclude that the photosynthesis to make starch does not take place without chlorophyll.
8. The inner part of leaf which was originally green (contained chlorophyll) turns blue-black on adding iodine solution showing that starch is present in this inner part of the leaf. From this observation we conclude that the photosynthesis to make starch takes place in the presence of chlorophyll. In other words, chlorophyll is necessary for the process of photosynthesis to take place.
Hope it helps you...
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Hello friend :
Your activity
To show that chlorophyll is present in leaves.
✔️take a potted plant with variegated leaves, for example, money plant or crotons.
✔️keep the plant in a dark room for 3 days so that all that starts gets used up
✔️ now keep the plant in sunlight for about 6 hours.
✔️pluck a leave from the plant mark the green areas in it and trace them on a sheet of paper.
✔️dip the leaf in boiling water for a few minutes after this, image it in a beaker containing alcohol.
✔️carefully place the above beaker in a water bath and heat till the alcohol begins to boil.
==> explanation
✔️the leaf becomes colourless because the chlorophyll gets dissolved in alcohol the colour of the solution becomes green.
________________________________
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Your activity
To show that chlorophyll is present in leaves.
✔️take a potted plant with variegated leaves, for example, money plant or crotons.
✔️keep the plant in a dark room for 3 days so that all that starts gets used up
✔️ now keep the plant in sunlight for about 6 hours.
✔️pluck a leave from the plant mark the green areas in it and trace them on a sheet of paper.
✔️dip the leaf in boiling water for a few minutes after this, image it in a beaker containing alcohol.
✔️carefully place the above beaker in a water bath and heat till the alcohol begins to boil.
==> explanation
✔️the leaf becomes colourless because the chlorophyll gets dissolved in alcohol the colour of the solution becomes green.
________________________________
Good morning friend have a nice day........
✌️✌️✌️✌️✌️✌️✌️✌️✌️✌️✌️✌️✌️️
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