Substances which originate at the tip of stem to promote growth are called as
A
Vitamins
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B
Enzymes
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C
Food materials
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D
Auxins
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Solution
The correct option is D Auxins Auxins are natural plant growth regulators. They are growth promoting phytohormones. They are generally produced by the growing apices of the stems and roots, from where they migrate to the regions of their action.