What is the function of phloem parenchyma?

What is present on the surface of the leaves which helps the plant prevent loss of water but is absent in roots?

Below is a list of plant fibres. From which part of the plant these are
obtained
a. Coir
b. Hemp
c. Cotton
d. Jute

The lawn grass (Cyandon dactylon) needs to be mowed frequently to prevent its overgrowth. Which tissue is responsible for its rapid growth?

Write the precise function of
a. Sieve tube
b. Interfasicular cambium
c. Collenchyma
d. Aerenchyma

36.

Palm is a monocotyledonous plant, yet it increases in girth. Why and how?

Interfascicular cambium develops from the cells of

• medullary rays

• xylem parenchyma

• endodermis

• endodermis

Lenticels are involved in

• Transpiration

• Gaseous exchange

• Food transport

• Food transport

Companion cells are closely associated with 

• sieve elements

• vessel elements

• trichomes

• trichomes

Closed vascular bundles lack

• ground tissue

• conjunctive tissue

• cambium

• cambium