The xylem in stems is generally endarch.

According to Hanstein, dermatogens give rise to epidermis.

Companion cells are associated with sieve tubes.

Vascular cambium gives rise to vascular phloem and vascular rays.

Radial vascular bundles are found in roots.

Cork is an excellent material for making bottle stoppers because it is airtight.

Lignified cell walls are found in woody tissue.

The living plant cells lacking nuclei are sieve tubes.

The plants become woody due to lignification.

Annual rings are well marked in trees growing in temperate regions.

The cork cells are impregnated with subrien.

Cambium causes an increase of tissues resulting in growth in girth.

The cork is produced by the activity of phellogen.

Vessel and companion cells are the characteristics of angiosperm.

Annual rings are most distinct in trees growing at Shimla.