Write the function of the following: (a) Microtubules (b) Sphaerosome (c) Endodermis (d) Companion cells (e) Lenticles

Explanation

(a) Microtubules help in cell division, organisation of intracellular structures, intracellular transport, and ciliary and flagellar motility.
(b) Sphaerosomes are involved in synthesis and storage of lipids.
(c) Endodermis forms the outer boundary of the stele (vascular tissues) of the stem, stores the starch grains and allows the solutions to pass through from the vascular bundles to the cortex.
(d) Companion cells control the functioning of adjacent sieve cells of phloem.
(e) Lenticles of bark allow the exchange of oxygen and carbon dioxide, and also help in transpiration.