An annual ring is formed by
Two consecutive rings of spring wood
Two alternate rings of spring wood and autumn wood
Two consecutive rings of autumn wood
Two alternate rings of sapwood and heartwood
$A$ : In monocot roots, pericycle gives rise to lateral roots and cork cambium.
$R$ : It has tetrach vascular bundles usually.
Annual rings are distinct in plants growing in
“Sap wood” is otherwise called
Bulliform cells are the modification of