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

Write about the elements of xylem.

Accepted Answer

Xylem is a conducting tissue that conducts water from roots to other parts of the plant. Xylem gives mechanical support to the plant body. Xylem is composed of: (i) xylem tracheids (ii) xylem fibres (iii) xylem vessels and (iv) xylem parenchyma.

Xylem tracheids: These are elongated or tube-like dead cells with hard, thick, and lignified walls. Their ends are tapering, blunt or chisel-like, and devoid of protoplast. Their function is the conduction of water and providing mechanical support to the plant.

Xylem fibres: These cells are elongated, lignified [deposition of secondary metabolite], and pointed at both ends. Xylem fibres provide mechanical support to the plant.

Xylem vessels: These are long cylindrical, tube-like structures with lignified walls and a wide central lumen. These cells are dead as these do not have protoplast. Their main function is to transport water and also to provide mechanical strength.
Xylem parenchyma: These are living and thin-walled cells. The main function of xylem parenchyma is to store substances.

Write about the elements of xylem.

Important Questions on Organization of Tissues

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