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81. The role of enthylene is both positive and negative. Justify the statement.

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82.

Explain different phases of growth.

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83. Sometimes the fruits fall even before they are ripe. Give reasons.

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84. How are plant hormones used to suppress weeds ?

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85. Explain experimentally the phases of growth.

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86. Define the terms apical dominance.

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87. Write a note on Growth curve.

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88. Write an essay on characteristics of Plant growth regulators.

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89. What are the conditions for Growth?

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90. Explain the reason : if a plant is grown in dark, its stem is soft, weak, slender and yellow and its leaves turn yellow.

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