On the basis of plane of division, the growth forms of meristems have been distinguished as
Mass, plate and rib meristems
Outer, middle and inner meristems
Peripheral and inner meristem
Periclinal, anticlinal and radial meristem
Vascular bundles in monocotyledons are considered closed because :
Tyloses thickenings are seen in
Trees at sea do not have annual rings because
Which of the following statement$(s)$ is/are true?
$(A)$ Uneven thickening of cell wall is characteristic of sclerenchyma.
$(B)$ Periblem forms cortex of the stem and the root.
$(C)$ Tracheids are the chief water transporting elements in gymnosperms.
$(D)$ Companion cell is devoid of nucleus at maturity.
$(E)$ The Commercial cork is obtained from Quercus suber
The tunica-corpus theory was proposed by