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Question
Read the assertion and reason carefully to mark the correct option in question.
Assertion: In plants differentiation is open.
Reason: Cells or tissues arising out of the same meristem have different structures at maturity.
Read the assertion and reason carefully to mark the correct option in question.
Assertion: In plants differentiation is open.
Reason: Cells or tissues arising out of the same meristem have different structures at maturity.
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Solution
The correct option is B If both assertion and reason are true and the reason is the correct explanation of the assertion.
Assertion-Reason relation
Growth of an organism involves increased protoplasm synthesis, cell division, cell enlargement.
Higher plants possess specific areas which take part in the formation of new cells. These are called meristems. Plant growth is localised because of the presence of meristems. Cells of the meristematic tissue have the ability to divide and self perpetuate. Thus plants have an open form of growth.
Differentiation is the process in which the cells mature to perform specific functions.
Growth of plants is exceptional because they retain the ability of unlimited growth throughout their lifetime. So, differentiation is observed throughout the growth and developmental phases of the plants. Hence, it is called as open form of differentiation.
So, differentiation is observed throughout the growth and developmental phases of the plants.
Cells or tissues arising out of the same meristem have different structures at maturity. For example: A meristematic cell can give rise to different cell types forming stele, epidermis, columella, cortex etc. Product of meristematic cell may differentiate into either leaf cell and sieve cell.
Hence, both the assertion and reason are correct and reason is the correct explanation for the assertion.
Final answer
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.
Assertion-Reason relation
Growth of an organism involves increased protoplasm synthesis, cell division, cell enlargement.
Higher plants possess specific areas which take part in the formation of new cells. These are called meristems. Plant growth is localised because of the presence of meristems. Cells of the meristematic tissue have the ability to divide and self perpetuate. Thus plants have an open form of growth.
Differentiation is the process in which the cells mature to perform specific functions.
Growth of plants is exceptional because they retain the ability of unlimited growth throughout their lifetime. So, differentiation is observed throughout the growth and developmental phases of the plants. Hence, it is called as open form of differentiation.
So, differentiation is observed throughout the growth and developmental phases of the plants.
Cells or tissues arising out of the same meristem have different structures at maturity. For example: A meristematic cell can give rise to different cell types forming stele, epidermis, columella, cortex etc. Product of meristematic cell may differentiate into either leaf cell and sieve cell.
Hence, both the assertion and reason are correct and reason is the correct explanation for the assertion.
Final answer
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.
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