Question

Hey guys. ...Good morning. ....My question is How will u test a leaf for starch? Mention any precautions u will take. ..
(Note-:This is class 7 question and if u don't know then don't ans)
Thank u....Have a nice day ...​

Answer 1

Answer:

I had this question last year

Iodine solution is used to test leaves for the presence of starch. You need to:

• heat a plant leaf in boiling water for 30 seconds (this stops its chemical reactions)
• heat it in boiling ethanol for a few minutes (this removes most of its colour)
• wash with water and spread onto a white tile
• add iodine solution from a dropping pipette

After a few minutes, the parts of the leaf that contain starch turn blue-black.

This proves that leaves contain  starch

Answer 2

Answer:

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