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Why the cotyledons are removed from seedlings for performing cultural experiments ?


Cotyledons are reserves of microelements, therefore they can interefere with the culture and make the study difficult. Hence, they are removed from the seedlings in the culture experiments. 
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What are the forces which operate in passive diffusion ?

Name the four broad categories of essential elements.

What do you understand by heterotrophic mode of nutrition ? 

Describe the passive mineral absorption.

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