Estimation of the age of the is done by
Counting the epidermal rings
Measuring the pith diameter
Counting the annual rings
Counting the late woods only
$A$ : Complementary cells are cut-off by phellogen towards outside.
$R$ : Phellogen is partially secondary in origin.
During the formation of interfascicular cambium, which cells lose the capacity to divide but mature to perform specific function ?
The undifferentiated cells are present in
The balloonshaped structures called tyloses
Casparian strips occur in