(C) The experiment demonstrates that the leaves are the primary sites for the perception of the photoperiodic stimulus. When the leaves are exposed to

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The photoperiodic stimulus is received by the leaves and transmitted by a hormone

(C) The experiment demonstrates that the leaves are the primary sites for the perception of the photoperiodic stimulus. When the leaves are exposed to the appropriate light/dark cycles,they produce a flowering stimulus,which is a chemical substance (hormone) known as florigen. This hormone is then translocated from the leaves to the shoot apices to induce flowering. Since the grafted plant also flowered,it confirms that the stimulus is mobile and can be transmitted through grafting from one plant to another.

Class 11 Biology Plant Growth and Development Photoperiodism and Vernalization

Difficult

When all parts except the leaves of a short-day plant are covered with a light-proof cover and then subjected to short-day light/dark treatment,it will produce flower buds. When a portion of this plant is grafted onto another plant of the same species which has been prevented from flowering by excessive exposure to light,this latter plant will also produce flower buds. Which is the best inference from this result?

A
Hormones can transmit information to all parts of plants
B
Leaves are more sensitive to the photoperiodic stimulus than other parts of the plant
C
The photoperiodic stimulus is received by the leaves and transmitted by a hormone
D
The photoperiodic stimulus is received by all parts of the shoot and transmitted by a hormone