Histogen theory was proposed by
Bailey
Haberlandt
Hanstein
Schmidt
(c) This concept was given by Hanstein ($1870$). According to this, there are $3$ groups of initials in the shoot apex.
$A$. According to Clowes root apex consists of an inverted cup like structure. $B$. Low amount of $RNA$, $DNA$ and protein is characteristic of waiting meristem. $C$. Cells of reserve meristem can divide only when the root apex gets injured.
The histogens are classified on the basis of
$P -$ protein is found in
Which of the following have sunken stomata?
Companion cells in plants are associated with
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