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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.

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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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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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