Give the term for-
The concentration of the essential element below which plants growth is retarded 

Critical concentration. 
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 What are protoplasmic elements ?

These are the elements which become components of protoplasmic constituents like nucleic acids, proteins, chlorophyll etc. viz, C, H, O, P, Fe, Mn, Cu.
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Deficiency of which elements cause delay in flowering?

The deficiency of elements like N, S, Mo cause delay in the flowering. 
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Give the significance of culture experiment.

Significances of culture experiment :

1. It tells the essentiality of an element.

2. It also tells the toxicity of an element when present in excess amount.

3. It can tell the result of interaction between different elements.

4. It tells us about the effects of the deficiency of a particular element. 

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Comment upon ammonification.


Ammonification is the process of conversion of proteins of the dead organisms into ammonia or ammonium compounds. Comment upon ammonification.
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