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6.Anatomy of Flowering Plants
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In old trees the greater part of secondary xylem is dark brown and resistant to insect attack due to:
$(a)$ secretion of secondary metabolities and their deposition in the lumen of vessels.
$(b)$ deposition of organic compounds like tannins and resins in the central layers of stem.
$(c)$ deposition of suberin and aromatic substances in the outer layer of stem.
$(d)$ deposition of tannins, gum, resin and aromatic substances in the peripheral layers of stem.
$(e)$ presence of parenchyma cells, functionally active xylem elements and essential oils.
Choose the correct answer from the options given below:
A
$(c)$ and $(d)$ Only
B
$(d)$ and $(e)$ Only
C
$(b)$ and $(d)$ Only
D
$(a)$ and $(b)$ Only
(NEET-2022)
Solution
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Standard 11
Biology
Similar Questions
Match the following
| Column $-I$ | Column $-II$ |
| $(a)$ Dicot leaf | $(p)$ Polyarch |
| $(b)$ Dicot stem | $(q)$ Pallisade and spongy mesophy $II$ |
| $(c)$ Monocot root | $(r)$ Endarch |
| $(d)$ Monocot leaf | $(s)$ Bulli form Cell |
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