Choose the correct answer from the alternatives given.
It is the length of the dark period that controls flowering. In nature, short days go with long nights and vice versa. Which of the following observations supports this statement?

Plants kept in 100% darkness do not flower

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Plants kept in 100% daylight do not flower

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Plants either are not dependent upon night length, or require a light period shorter or longer than given amount, and a brief dark period triggers flowering

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Plants either are not dependent upon day length, or require a dark period shorter or longer than a given amount, and a brief flash triggers flowering

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Solution

The correct option is D Plants either are not dependent upon day length, or require a dark period shorter or longer than a given amount, and a brief flash triggers flowering
Photoperiod is the phenomenon of the growth and development of plants according to light and dark period. The flowering of the plants is dependent upon the light period or in plants that have the property of both short and long days plant then the small flashes of light are given in between the dark period. Plants are dependent on light period as it was found that when the plants are placed in complete lightness or darkness then it will not flower. However small flashes of light are provided in the dark period for flowering to occur.
So, the correct option is 'Plants either are not dependent upon day length, or require a dark period shorter or longer than a given amount, and a brief flash triggers flowering'.

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Choose the correct answer from the alternatives given.It is the length of the dark period that controls flowering. In nature, short days go with long nights and vice versa. Which of the following observations supports this statement?

Choose the correct answer from the alternatives given.
It is the length of the dark period that controls flowering. In nature, short days go with long nights and vice versa. Which of the following observations supports this statement?