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  4. The following statements are given about plant growth hormones :

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Q. The following statements are given about plant growth hormones :

EAMCETEAMCET 2006

Solution:

Miller et. al., (1955) discovered first cytokinin from degraded sample of yeast DNA and coconut milk and called it kinetin which is 6 furfuryl amino purine (derivative of purine base-adenine). - Auxin and cytokinin are essential for morphogenesis or differentiation of tissue and organ. High ratio of cytokinin to auxin favour bud formation whereas low ratio of cytokinin to auxin favour root formation. ABA biosynthesis takes place in chloroplast and other plastid. This is formed from mevalonic acid or xanthophylls. ABA produced in stress condition i.e., the plants which present in environment which show stress condition.