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Which of the following tissues is present in stems, around vascular bundles, in the veins of leaves and the hard covering of seeds and nuts?
Apical meristem
Parenchyma
Sclerenchyma
Epidermis
Sclerenchyma
The tissue described is Sclerenchyma, which provides mechanical strength to plants. It is composed of dead cells with heavily lignified, thick walls and is primarily responsible for structural support in mature plant parts.
The tissue described is Sclerenchyma, which provides mechanical strength to plants. It is composed of dead cells with heavily lignified, thick walls and is primarily responsible for structural support in mature plant parts.
Think of Sclerenchyma as the steel rebar inside concrete structures; it provides the rigid, non-flexible framework that keeps the building (or in this case, the plant) standing upright.
L-S-D: Lignified, Sclerenchyma, Dead.
Sclerenchyma cells possess thick secondary cell walls impregnated with lignin, a complex polymer that provides extreme hardness and resistance to decay. Because these cells are dead at maturity, they act as rigid girders or 'skeletons' that protect delicate tissues and prevent bending or collapsing under environmental stress.
Sclerenchyma cells are dead at maturity.
The cell walls contain lignin, making them rigid and water-impermeable.
Found in two main forms: fibers (long, slender) and sclereids (irregular, hard, found in nutshells).
Provides structural rigidity to stems, veins, and seed coats.
Excellent mechanical strength and support
High resistance to external pressures and mechanical damage
Cannot grow or divide once mature due to rigid, dead walls
Not involved in metabolic activities or transport
Hard shells of walnuts and coconut husks
Jute fibers used in textiles and ropes
Apical meristem is involved in primary growth (lengthening).
Parenchyma consists of thin-walled, living cells involved in storage and photosynthesis.
Epidermis is the outermost protective layer of the plant body.
C is correct тАФ Sclerenchyma is the tissue responsible for providing strength and hardness to plant parts like vascular bundles, leaf veins, and seed shells.
When answering plant tissue questions, remember: Parenchyma is for storage, Collenchyma is for flexible support, and Sclerenchyma is for rigid, hard support.
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