Plant Tissues

Protoderm gives rise to epidermis in developing organs.

Intercalary meristems are present at the base of leaf in pinus.

Apical cell theory is applicable to both bryophytes and pteridophytes.

Tunica and corpus are the zones of apical meristem.

The cells of inner layer of tunica give rise to leaf primordia.

The central core of the plant is called plerome. It is the central core of a primary meristem of a plant or a plant part that according to the histogen theory, gives rise to the stele.

The inactive cells of quiescent centre have less DNA as in this zone, the cells divide at very slow rate.

Inter-fascicular cambium, cambium of root and cork cambium are all secondary meristems.

According to the histogen theory, the periblem gives rise to cortex.

In aquatic plants, the intracellular spaces between the parenchymatous cells are very large and this space is called arenchyma. Arenchyma store air and help the organs float in water.

Prosenchyma are fibre-like elongated parenchyma. It provides rigidity and strength to the plant.

Starch-containing cell layer in dicots is called endodermis.

Trichomes are hairs which reduce excessive water loss, i.e. transpiration.

A reduced form of sclerenchyma cells with highly thickened lignified walls is called sclereid.

Sclereids are responsible for grittiness of a pear. Sclereids are extremely thick-walled stone cells.