Question

define phloem and its cell types

Answer 1

$\textbf{Phloem}$:

It contains tubes but has no mechanical function.

It consists of the following four type of cells :

1. $\textbf{Sieve Tubes }$:

These are slender, tube like structure bounded by thin walled cells.

2. $\textbf{Companion cells }$:

Generally associated with the sieve tubes is a small child containing dense and very active cytoplasm and large elongated nucleus.

3. $\textbf{ Phloem Parenchyma }$

4. $\textbf{Phloem Fibres }$

Answer 2

Phloem is the complex tissue, which acts as a transport system for soluble organic compounds within vascular plants.

There are two main types of cells ;

1. Sieve element cell.

2. Companion cell.