HORTICULTURE

HORTICULTURE SCIENCE

ULTRA STRUCTURE OF PLANT CELLS AND ORGANS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which of the following is an example of sclerenchyma tissue that are shorter than fiber and primary component in seed coat, coconut shells, and gave gritty texture on ripe pears?
A
lignin
B
Pectin
C
Fiber
D
Sclereid
Explanation: 

Detailed explanation-1: -Flax bast fiber cells are an ideal example of sclerenchyma fibers, with extraordinary cell wall thickness and length.

Detailed explanation-2: -The husk of coconut is made of sclerenchymatous tissue. It has thick-walled, usually lignified cells which form the outer protective covering of fruits and nuts. It is also known as supportive tissues of the plant as it provides mechanical stiffness and strength.

Detailed explanation-3: -Sclerenchyma cells are elongated, dead cells with lignin deposits in their cell wall. They have no intercellular gaps. Sclerenchyma is found in the covering of seeds and nuts, around the vascular tissues in stems and the veins of leaves. Sclerenchyma provides strength to the plant.

Detailed explanation-4: -Sclerenchyma is a plant tissue providing mechanical stiffness and strength. Fibres and sclereids are the main types of sclerenchyma cells. Most sclerenchyma cells show intrusive growth. The cell walls of sclerenchyma have thickened secondary layers made from cellulose, hemicelluloses and lignin.

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