Name: Bone Structure and Types
Uploaded: 2019-07-19
Duration: 4 min 55 s
Description: Bones are living tissue with blood vessels made of various cells, proteins, minerals and vitamins. Let's learn about bone structure and types in this video.

Question

What are the permanent tissues? Describe the different types of simple permanent tissues.

Accepted Answer

There are two types of permanent tissues: Simple permanent tissues and complex permanent tissues. The tissues which have undergone differentiation and are incapable of meristematic activity are called simple permanent tissues. The simple permanent tissues are of three types: Parenchyma, collenchyma, and sclerenchyma.

Parenchyma cells are thin-walled, oval, rounded, or polygonal in shape with well-developed spaces among them. In aquatic plants, parenchyma possesses intercellular air spaces and is named aerenchyma. When exposed to light, parenchyma cells may develop chloroplasts and are known as chlorenchyma. Parenchyma may store water in many succulent and xerophytic plants. It also serves the functions of storage of food reserves, absorption, buoyancy, secretion, etc.,

Collenchyma is a living tissue found beneath the epidermis. Cells are elongated with unevenly thickened non-lignified walls. Cells have rectangular oblique or tapering ends and persistent protoplast. They provide mechanical support for growing organs.

Sclerenchyma consists of thick-walled cells that are often lignified. Sclerenchyma cells are dead and do not possess living protoplasts at maturity. Sclerenchyma cells are grouped into fibres and sclereids.
It provides structural support to the plant.

What are the permanent tissues? Describe the different types of simple permanent tissues.

Important Questions on Organization of Tissues

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