A vascular bundle without pith is
Protostele
Siphonostele
Solenostele
None of these
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:
Abundant pith is characteristic of
Which of the following statements is correct?
Draw illustrations to bring out anatomical difference between
$(a)$ Monocot root and dicot root
$(b)$ Monocot stem and dicot stem
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 |