The lacunae in the vascular bundles of monocot stem is
A large sized protoxylem
A mucilage canal
Metaxylem
Lysigenous water cavity
The tunica-corpus theory was proposed by
The layer of cells outside the phloem meant for giving rise to the root branches is called
Which of the following is the function of heartwood?
What is the commercial source of cork ? How is it formed in the plant ?
A hundred year old tree which shows well marked annual rings in its trunk will have