Tag: permanent tissues and their types
Questions Related to permanent tissues and their types
Plant tissue responsible for stiffness in husk of coconut is
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Sclerids
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Phloem cells
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Xylem fibres
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Sclerenchyma fibres
The shape of the sclerenchyma cells are elongated and cell walls are thickened by lignin. The plant gets very strong support and strength since these are heavily deposited with lignin. It is responsible for the stiffness of coconut fibres.
Most of the plant tissues are ______ cells.
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Dead
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Alive
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Minute
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Large
Since dead cells can provide mechanical strength as easily as live ones and need less maintenance.
What is the function of sclerenchymatous tissue?
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Flexibilty
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Tenderness
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Strength
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All of the above
The chief mechanical tissue of the plant body composed of highly thick walled cell with little or no protoplasm is called as sclerenchyma. The main function of sclerenchymatous tissues is to give support to the plant. It also provides hardness and protective covering to seed and nuts.
Therefore, the correct answer is option C.
Which cells among the permanent tissue are impermeable to water?
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Parenchyma
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Collenchyma
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Both A and B
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Sclerenchyma
The chief mechanical tissue of the plant body composed of highly thick walled cell with little or no protoplasm is called as sclerenchyma. Sclerenchyma consist of lignin. Lignin deposition is so thick that the cell walls become strong, rigid and impermeable to water.
Which of the following tissues is dead at maturity?
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Sclerenchyma
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Collenchyma
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Parenchyma
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Both B and C
The chief mechanical tissue of the plant body composed of highly thick walled cell with little or no protoplasm is called as sclerenchyma. The thickening of cell wall is due to deposition of cellulose or lignin or both. Lignin deposited cells are said lignified. Sclerenchyma cells are dead at maturity because of the absence of protoplast.
The cells of sclerenchyma can be classified as
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Fibres and fibriosis
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Ligaments
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Fibre and sclereids
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None of the above
The chief mechanical tissue of the plant body composed of highly thick walled cell with little or no protoplasm is called as sclerenchyma.
1. Fibres- Fibres are long, elongated sclerenchymatous cells with pointed ends.
2. Sclereids- Sclerenchymatous cells which are short and possess extremely thick lignified walls.
The sclerenchyma cells are thick walled due to the presence of
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Acetone
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Lignin
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Lipids
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None of the above
The chief mechanical tissue of the plant body composed of highly thick walled cell with little or no protoplasm is called as sclerenchyma. The thickening of cell wall is due to deposition of cellulose or lignin or both. Lignin deposited cells are said lignified.
Which cell is found in the husk of coconut?
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Xylem
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Sclerenchyma
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Collenchyma
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All of the above
The chief mechanical tissue of the plant body composed of highly thick walled cell with little or no protoplasm is called as sclerenchyma. The thickening of cell wall is due to deposition of cellulose or lignin or both. Lignin deposited cells are said lignified. Sclerenchyma is the tissue which makes the plant hard and stiff.
The osteosclereids are seen in
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Seed coat of crotalaria
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Seed coat of pisum
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Pulp of pyrus
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Petioles of banana
- Osteosclereids are also known as bone cells. It is a type of sclereid that forms the hypodermal layer in seeds, fruits, and leaves of some plants (dicots).
- It was first seen in the seed coat of Pisum during the maturation. These are the columnar cells that are dilated at the ends.
So, the correct option is B.
Which of the following statement is true?
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The collenchyma occurs in layers below the epidermis in monocotyledonous plants.
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Sclerenchyma cells are usually dead and without protoplasts.
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Xylem parenchyma cells are living and thin walled and their cell walls are made up of lignin.
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The companion cells are specialized sclerenchymatous cells.
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Phloem fibres are generally present in the primary phloem.
In stems and leaves of monocots, collenchyma is absent. Instead, sclerenchyma is present in monocots. Xylem parenchyma consists of living cells of parenchyma, which are thick and their secondary cell wall is lignified. Sieve tube member is associated with one or more specialized parenchyma cells called as companion cells. Phloem fibres are generally present in the secondary phloem.
Thus, the correct answer is option B.