Vernalization stimulates flowering in
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Solution
Carrot is a biennial plant which flowers in the second season. Vernalization is the subjection of seeds or seedlings to low temperature in order to has ten plant development and flowering. Vernalization is commonly used for crop plants such as winter rye and is possible because the seeds and buds of many plants require cold in order to break dormancy. Winter cereals are therefore sown in the autumn for flowering the following year.However, if germinating seeds are artificially vernalized they can be sown in the spring for flowering the same year. Biennial plants, such as carrot (Daucus carota),will remain in their non-flowering rosette form until subjected to cold treatment.
Which one of the following generally acts as an antagonist togibberellins?
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Solution
Gibberellins & ABA are antagonistic with each other.ABA counteracts many effects of gibberellins like induction of hydrolases and amylases in barley seedlings.
Through their effect on plant growth regulators, what do the temperature and light control in the plants?
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Solution
Flowering is induced by light and temperature.
Which of the following triggers seed germination ?
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Solution
The uptake of water by the seed begins the processes that lead to seed germination.
Which one of the following is correctly matched ?
Coiling of garden pea tendrils around any support is an example of:
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Solution
The coiling of garden pea tendrils around any support is an example of thigmotropism. Thigmotropism is the growth movement in response to touch. The stems and tendrils of the climbers are positively thigmotrophic in their response.
Phototropic curvature is the result of uneven distribution of:
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Solution
Phototrophic curvature is the result of uneven distribution of auxin.The experiments conducted by Charles Darwin concluded that the tip of coleoptile of canary grass contain auxin that causes the bending of the entire coleoptile towards the light source.
Which of the following is the application of vernalization ?
The pfr (far-red form of phytochrome) is required for flowering in :
Which one of the following acids is a derivative of carotenoids?
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Solution
Abscisic acid (ABA), also known as abscisin II and dormin, is a plant hormone. It functions in many plant developmental processes, including bud dormancy.Abscisic acid is a derivative of carotenoids. It was called“abscisin II” originally because it was thought to play a major role in abscission of fruits. At about the same time another group was calling it “dormin” because they thought it had a major role in bud dormancy.The name abscisic acid (ABA) was coined by a compromise between the two groups.