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Question
Assertion :Clowes reported quiscent centre in Zea mays root, region behind rootcap. Reason: Méristème d'attente is region similar to this in shoot apex as its cells also have slow DNA replication.
Assertion :Clowes reported quiscent centre in Zea mays root, region behind rootcap. Reason: Méristème d'attente is region similar to this in shoot apex as its cells also have slow DNA replication.
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Solution
The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
Just behind the region of the root cap apical meristem is present which is the tissue made up of cells that divide actively. However, studies by Clowes showed that in Zea mays, this meristematic region behind the root cap is the quiescent center. In case of shoot apex, in angiosperms, though there are no known apical cells, theories suggest that the central region of the apical dome in angiosperms is made up of a mass of cells that has a relatively low rate of division and is thus known as méristème d'attente, or “waiting meristem; surrounding this is the anneau initial. So, both the statements are correct but the reason is not the correct explanation for the assertion. Thus, the correct answer is B.
Just behind the region of the root cap apical meristem is present which is the tissue made up of cells that divide actively. However, studies by Clowes showed that in Zea mays, this meristematic region behind the root cap is the quiescent center. In case of shoot apex, in angiosperms, though there are no known apical cells, theories suggest that the central region of the apical dome in angiosperms is made up of a mass of cells that has a relatively low rate of division and is thus known as méristème d'attente, or “waiting meristem; surrounding this is the anneau initial. So, both the statements are correct but the reason is not the correct explanation for the assertion. Thus, the correct answer is B.
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