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The effect of cytokinins was first reported after adding what to plant embryos in culture?
AThe liquid endosperm of coconuts
BThe pressed sap of ripening grapes
CThe ground endosperm of maize seed
DThe filtered extract of root nodules
Answer & Solution
Correct answer: A. The liquid endosperm of coconuts
1. The first report of cytokinin activity came from a tissue culture observation.
2. Adding the liquid endosperm of coconuts to developing plant embryos in culture stimulated their growth.
3. The stimulating growth factor was found to be cytokinin, a hormone that promotes cell division.
4. Cytokinins are most abundant in growing tissues such as roots, embryos and fruits, where cell division is occurring.
5. Grape sap and root nodule extracts are associated with gibberellin treatment and nitrogen fixation respectively.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 30 "Plant Form and Physiology", section 30.6 Plant Sensory Systems and Responses_
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