Axillary bud and terminal bud are derived from the activity of

Assertion : Higher plants have meristematic regions for indefinite growth.
Reason : Higher plants have root and shoot apices.

Definitions / Explanation :

$(i)$ Conjoint vascular bundles

$(ii)$ Secondary growth

Vascular tissues in flowering plants develop from

Location / Function :

$(i)$ Fascicular cambium

$(ii)$ Pericycle

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: