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Which cells lack living protoplasts at maturity?
a. Parenchyma
b. Companion
c. Collenchyma
d. Sclerenchyma
Introduction:
Plant tissue is defined as a group of cells that carry out a specific function. It is a functional unit of the plant that connects all the organs (stems, leaves, and roots) of the plant with one another. The three basic types of the plant tissues are ground tissue that includes parenchyma, collenchyma, and sclerenchyma cells, vascular tissue that includes tracheids, vessel elements, sieve tubes, and companion cells, and dermal tissue that includes epidermal cells, trichomes and stomata.
Answer to Problem 1U
Correct answer:
Sclerenchyma cells are the thick-walled cells that lack the living protoplast at maturity. Therefore, option d. is correct.
Explanation of Solution
Reason for the correct statement:
The sclerenchyma cells are tough cells with rigid cell walls. They lack the living protoplast at maturity. They are rigid and non-living cells that provide strength to the plant.
Option d. is given as “Sclerenchyma”.
As “the sclerenchyma does not have a living protoplast at the time of maturity,” it is the right answer.
Hence, option d. is correct.
Reasons for the incorrect statements:
Option a. is given as “Parenchyma”.
Parenchyma tissues contain a living protoplast at maturity. Therefore, it is a wrong answer.
Option b. is given as “Companion”.
The protoplast is present in the companion cells at the time of maturity. Therefore, it is a wrong answer.
Option c. is given as “Collenchyma”.
Collenchyma tissues also have live protoplast at maturity. Therefore, it is a wrong answer.
Hence, options a, b, and c. are incorrect.
Conclusion:
The plant cells that lack living protoplasts (all the components of the plant cell excluding the cell wall) at maturity are sclerenchyma.
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Chapter 36 Solutions
Biology
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