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(D) Julius von $Sachs$ was a German botanist who,in the late $19$th century,speculated that plants contain specific chemical substances responsible fo

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Sachs

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(D) Julius von $Sachs$ was a German botanist who,in the late $19$th century,speculated that plants contain specific chemical substances responsible for organ formation. He proposed that these substances are synthesized in different parts of the plant and are responsible for the growth and differentiation of organs. These substances are now known as plant hormones or phytohormones.

Who for the first time speculated the presence of organ-forming substances in plants,now called hormones?

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