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Tuesday, February 21, 2012

The Factors Needed for the Process of Photosynthesis

Now I think you what are the products and byproducts of photosynthesis process. Now I'm going to let you now some tests that will lead you to find what are the factors needed for this photosynthesis. Firstly these are the factors needed for the process.
  1. Carbon Dioxide.
  2. Sunlight.
  3. Water.
  4. Chlorophyll. 

Carbon Dioxide test for Photosynthesis

Carbon dioxide is absorbed by potassium hydroxide. Take two similar, transparent polythene bags and put some potassium hydroxide pellets into one bag. Insert some leaves of a potted plant which has kept in the dark for two days into this bag and tie the mouth well. Insert some leaves into the other bag and tie the mouth of this bag too. Allow them to receive sunlight for some time and then test these for starch. I'll tell you late how to test for the starch.

*There is no starch produced in the leaves in the bag containing potassium hydroxide.
*Starch is available in the leaves of the bag without potassium hydroxide.
*This shows that carbon dioxide is necessary for photosynthesis.

Light Energy test for Photosynthesis

Select a leaf from a potted plant kept in the dark for two days. Cover the leaf with two pieces of black paper on either side. Allow the plant to get sunlight for a few hours. Test the leaf for starch.

You will notice that the covered part of the leaves will not turn blue. But the uncovered leaves turn blue. this experiment shows you that sunlight is necessary for photosynthesis.

**If you want to show that water is necessary for photosynthesis you should have green leaves without water. If you remove water from leaves they will die. Therefore you can't design an experiment to show that water is necessary for photosynthesis.

Chlorophyll test for Photosynthesis

Select a leaf that does not contain chlorophyll for this experiment. Multicolour leaves like hibiscus, colacasia or choleas may be used. Let the leaf remain in sunlight for a few hours and pick it up. Draw a diagram of the leaf and mark the shite spots that do not contain chlorophyll. Next test the leaf for starch and compare it with the diagram drawn. you will see that the portions which were green in color have turned into blue. This shows that chlorophyll is necessary for photosynthesis.

Ok this is the time for starch test!

First you should remove chlorophyll of the leaf by dipping the leaves in alcohol heat bath. Then put some iodine to chlorophyll removed leaf. That's it!

How about this one? Great! Awesome! Or Nice Then just share with your friends and Comment your Idea Below. Appreciate it!


Anonymous said...


Anonymous said...

this is a great help

Anonymous said...

that helped so much thanks

Anonymous said...

Wasn't really what i was looking for... But it was helpful.. thankx.. :) whoever-wrote-this

Anonymous said...

This wasn't exactly what i was looking for.. But thanx!!

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