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Question
In the given graph, a Hibiscus plant has been exposed to a certain wavelength of light for 2 days. At which wavelength a, b, c or d, has the Hibiscus plant been exposed that resulted in closure of stomata because guard cells became flaccid?
In the given graph, a Hibiscus plant has been exposed to a certain wavelength of light for 2 days. At which wavelength a, b, c or d, has the Hibiscus plant been exposed that resulted in closure of stomata because guard cells became flaccid?
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Solution
The correct option is C c
Light, especially blue light, triggers the stomatal opening. Specific blue light receptors are involved. Light is absorbed in the green pigments of the chloroplasts. Certain wavelengths are taken in by the chlorophyll, but green (and yellow) light is not absorbed. These wavelengths enter the leaf and either pass through or are reflected out. Hence hibiscus plant when exposed to green light results in closure of stomata because guard cells became flaccid.
Light, especially blue light, triggers the stomatal opening. Specific blue light receptors are involved. Light is absorbed in the green pigments of the chloroplasts. Certain wavelengths are taken in by the chlorophyll, but green (and yellow) light is not absorbed. These wavelengths enter the leaf and either pass through or are reflected out. Hence hibiscus plant when exposed to green light results in closure of stomata because guard cells became flaccid.
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