How can you Prove that Light is Necessary for Photosynthesis

Light is Necessary for Photosynthesis

 

  1. i) De-starch a potted plant by keeping it in dark for two days.

 

  1. ii) Then transfer it to light and select two leaves of this plant for experiment

 

iii) Now wrap one by black paper.

 

  1. iv) Wrap other by black paper but a L shaped part of the paper is cut out so that light can pass from here.

 

  1. v) Now put the potted plant to light for 6 hours

 

  1. vi) It will observe that leaf which did not receive any light is free of starch and brown.

 

vii) Second leaf light could pass through L shaped area. Only this area turn dark blue while other part remain brown.

 

viii) This shows that light is necessary for photosynthesis.

 

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