Assertion : In woody stems,the amount of hear | vedclass

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(A) In woody trees,the central portion of the stem is dark in color. It is hard and tough due to the deposition of resins,tannins,gums,and the formati

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If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

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(A) In woody trees,the central portion of the stem is dark in color. It is hard and tough due to the deposition of resins,tannins,gums,and the formation of tyloses. This central hard portion is called heartwood. It is formed by secondary growth. Due to cambial activity,the older secondary xylem becomes non-functional and forms heartwood or duramen. As the tree grows,more secondary xylem is produced,and the older layers are converted into heartwood,causing its amount to increase year after year. Therefore,both the Assertion and the Reason are correct,and the Reason is the correct explanation of the Assertion.

List-$I$	List-$II$
$(a)$ Lenticels	$(i)$ Phellogen
$(b)$ Cork cambium	$(ii)$ Suberin deposition
$(c)$ Secondary cortex	$(iii)$ Gaseous exchange
$(d)$ Cork	$(iv)$ Phelloderm

Assertion : In woody stems,the amount of heart wood continues to increase year after year.
Reason : The cambial activity continues uninterrupted.

Similar Questions

The position of xylem in secondary xylem is:

Match List-$I$ with List-$II$:

List-$I$ List-$II$

$(a)$ Lenticels $(i)$ Phellogen

$(b)$ Cork cambium $(ii)$ Suberin deposition

$(c)$ Secondary cortex $(iii)$ Gaseous exchange

$(d)$ Cork $(iv)$ Phelloderm

Choose the correct answer from the options given below:

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Assertion : In woody stems,the amount of heart wood continues to increase year after year.Reason : The cambial activity continues uninterrupted.