21.Name any two synthetic auxins used in agriculture.
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22.A student cultures a callus from the tabacco pith in a sterilized minimal nutritive medium but adds more cytokinins than auxins, what would develop first from the callus shoot buds or the roots ?
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23.What is vernalisation?
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24.What can induce bolting in a cabbage plant?
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25.
Name the hormone which enhances the rate of respiration during the ripening of fruit.
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26.What does an over ripe apple release which affects all other apples in the basket ?
Short day plants are those plants which require exposure to light for a duration less than the critical duration, for initiating flowering.
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29.A farmer grows cucumber plants in his field. He wants to increase the number of female flowers in them. Which growth regulator can be applied to achieve this ?
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30.Name the plant hormone that can delay leaf senescence.
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