What is seed dormancy ? Which two hormones affects dormancy. 

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71. Name the phytohormone which is a derivative of purines ?
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72. 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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73. Where natural cytokinins are synthesised ?
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74.  Describe the various steps involved in seed germination.
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75.

What structural changes do the cells undergo during differentiation as tracheary elements?

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76. Growth is an important phenomenon of living. Justify the statement with reasons.
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77. Differentiate between growth hormones and inhibitor hormones.
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78. In what ways can you compare growth of living systems quantitatively?
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79. Classify the plants depending upon photoperiodism.
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80. Distinguish between short day plants and long day plants.
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