Botany and Plant Science

Mustard leaves have lobed margins. This type of leaf margins are incised upto various deptths and divided into small lobes

In desert plants, epidermis has a thick waxy coating of cutin. Cutin checks loss of water in desert plants.

The lateral meristem is concerned with secondary growth. Its meristematic activity adds cells to the primary body, which is derived from the apical meristems.

In the xylem, the substances move only in the upward direction, but in the phloem, substances move in both the directions.

Apical meristem is present at the growing tips of stems and roots and increases the length of the stem and the root.

Large air cavities are present in the simple parenchyma of the aquatic plants. These cavities gives buoyancy to the aquatic plants to help them float in water. This type of parenchyma is known as aerenchyma.

Xylem is a dead, complex permanent tissue of plants. It is composed of tracheids, vessels, xylem fibres and xylem parenchyma. Xylem parenchyma is the only living tissue of the xylem responsible for the storage of food.

The periderm protects the plant from injuries, pathogens and also from excessive water loss.

Parenchyma cells also control plant's metabolism like photosynthesis, respiration, protein synthesis.

Bulliform cells occur in groups on the upper surface of isobilateral leaves. 

The upper epidermis of a leaf lacks chlorophyll. 

This statement is true.

Parenchymatous cells make the bundle sheath extension in a dorsiventral leaf.

The intra- and inter-fascicular cambium together develop meristematic activity to form a ring of cambium, called cambium ring.

Dumb-bell-shaped guard cells are only found in monocots.