Page 2 - 2- Lesson Notes- Simple Permanent Tissue

(A)Simple Permanent Tissues

Collenchyma

(i) Parenchyma
Structure

• It is a living cell

• It has prominent nucleus and protoplast
• The cells of parenchyma are isodiametric or polyhedral in shape. They may be

polygonal, oval, round or elongated
• These cells have large intercellular space

Types of Parenchyma Cells

Parenchyma cells can be categorised based on their structure, location and
functions performed. The main parenchyma tissues are:

1. Chlorenchyma:

Parenchyma cells which have chloroplast in them are known as chlorenchyma
and perform photosynthesis.

2. Aerenchyma:
They contain very large intercellular spaces. These are present in aquatic

plants. It helps in the buoyancy of the floating plants