BIOMOLECULES AND ENZYMES

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BIOLOGY

HORMONES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
In nature, poinsettias bloom in early March. Research has shown that the flowering process is triggered three months before blooming occurs. In order to make poinsettias bloom in December, florists change the length of the light-dark cycle in September. Given the information and clues above, which of the following is a correct statement about poinsettias?
A
They are short-day plants.
B
They require a light period longer than some set minimum.
C
They require a shorter dark period than is available in September
D
The dark period can be interrupted without affecting flowering.
Explanation: 

Detailed explanation-1: -Stomatal opening is promoted by blue light and involves the phototropin photoreceptors and their downstream target BLUE LIGHT SIGNALING1 (BLUS1; Kinoshita et al., 2001; Takemiya et al., 2013).

Detailed explanation-2: -Florigen (or flowering hormone) is the hypothesized hormone-like molecule responsible for controlling and/or triggering flowering in plants. Florigen is produced in the leaves, and acts in the shoot apical meristem of buds and growing tips.

Detailed explanation-3: -Florigen, or flowering hormone, is thought to be a protein insulin particle that controls or enhances the flower initiation process in plants. These florigens are made in the leaf and are found in the bud’s stem and root apical meristems and growing tips.

Detailed explanation-4: -Photoperiodism is the response to changes in daylength that enables plants to adapt to seasonal changes in their environment. The best studied example of photoperiodism in plants is flowering, but other responses to daylength include bud dormancy and bulb or tuber initiation.

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