What is seed dormancy ? Which two hormones affects dormancy. 

Seed Dormancy : Seed dormancy is defined as a state in which seeds are prevented from germinating even under environmental conditions normally favorable for germination.  These conditions are a complex combination of water, light, temperature, gasses, mechanical restrictions, seed coats, and hormone structures.

The two hormone affecting the seed dormancy are:

i. 
Ethylene breaks seed and bud dormancy, initiates germination in peanut seeds, sprouting of potato tubers.

ii. Abscissic acid induces see dormancy. 
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Where natural cytokinins are synthesised ?

Natural cytokinins are synthesised in regions where rapid cell division occurs for example root, apices, developing shoot buds, young fruits etc.
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Writes notes on following :

(a) Senescence (b) Abscission

(c) Quiescence (d) Vivipary.


(a) Senescence : Senescence is the process of  ageing in plants. It is the period between maturity and death.

(b) Abscission: It is the natural falling of leaves, foliage branches, fruits, floral parts etc.  

 

(c) Quiescence : It is the suspension of growth due to external factors. It is a period during which development is suspended. 

(d) Vivipary : It is the process when seeds germinate inside fruits which are still attached to the mother plant. 

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What are redifferentiated cells ?

The group of that once differentiated and have returned to their original specialized form are called as redifferentiated cells. 
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List some of the tissues in a woody dicotyledenous plant that are the products of redifferentiation.

Secondary xylem, secondary phloem, phellem, phelloderm etc are the products of redifferentiation.
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