Name the three inhibitors which were chemically identical and named abscisic acid.

The three inhibitors which were chemically identical are - inhibitor-B, abscission II and dormin. these were named abscisic acid (ABA).
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Why the terrestial plants cannot germinate under water ?

The terrestrial plants do not have the system to absorb oxygen from the water. Since the plants need oxygen to germinate therefore when it is present under water it does not get the required amount of oxygen. 
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What happens in In arithmetic growth In arithmetic cell division In arithmetic growth?

In arithmetic growth, after mitotic division only one cell continues to divide and the others differentiate and mature. For eg - root elongating at a constant rate.

Mathematically it is expressed as. 



Where
L= Length at time 't'
Lo Length at time 'zero'
r = Growth rate


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What is uniqueness in ethylene among phytohormones ?


Ethylene is unique as it is the only gaseous hormone.
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How cytokinins delay leaf senescence ?

Cytokinins promote nutrient mobilisation which helps in the delay of leaf senescence.
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