Tag: simple permanent tissues

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Questions Related to simple permanent tissues

Multiple choice botany plant tissues permanent tissues and their types simple permanent tissues tissues: plant tissues

In sclerenchyma, wall is

  1. Lignified

  2. Suberised

  3. Pectinised

  4. Cutinised
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sclerenchyma cells are characterized by relatively thick, lignified secondary cell walls. The lignified wall gives sclerenchyma cells their rigidity, and they function primarily in mechanical support and water conduction. They also make up most rigid parts of the plant (e.g., seed coats and some fruit walls) and are often positioned so that they provide mechanical protection for softer plant parts. 

So, the correct answer is 'Lignified.'

Multiple choice botany plant tissues permanent tissues and their types simple permanent tissues tissues: plant tissues

Common between sclerenchyma and collenchyma is

  1. Material transport

  2. Conduction of water and minerals

  3. Providing buoyancy

  4. Providing support
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Plants are composed of a variety of different cells, two of which are sclerenchyma and collenchyma. The similarity of both cells is that both of them function for support. These cells are two of the three classes of ground tissue together with Parenchyma cells. Collenchyma cells are responsible for giving support to extra structural regions and Sclerenchyma cells are the main structural support for plants. 
So, the correct answer is 'Providing support.'
Multiple choice botany plant tissues permanent tissues and their types simple permanent tissues tissues: plant tissues

Which of the following is not related to the structure of stomata?

  1. Epidermal cells

  2. Guard cells

  3. Sclerenchyma cells

  4. Accessory cells
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sclerenchyma is the supporting tissue in plants. Two types of sclerenchyma cells exist: fibers and sclereids. Their cell walls consist of cellulose, hemicellulose and lignin. Sclerenchyma cells are the principal supporting cells in plant tissues that have ceased elongation where as Stomata are cell structures in the epidermis of tree leaves and needles that are involved in the exchange of carbon dioxide and water between plants and the atmosphere.

So, the correct answer is 'Sclerenchyma cells.'

Multiple choice botany plant tissues permanent tissues and their types simple permanent tissues tissues: plant tissues

Which is not true regarding sclerides?

  1. Found in shells of nuts, pulp of Guava and Pea

  2. Stone cells

  3. Constituent of sclerenchyma

  4. Group of living cells
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Sclereids are a reduced form of sclerenchyma cells with highly thickened, lignified cellular walls that form small bundles of durable layers of tissue in most plants. The presence of numerous sclereids form the cores of apples and produce the gritty texture of guavas. 
So, the correct answer is 'Group of living cells.'
Multiple choice botany plant tissues permanent tissues and their types simple permanent tissues tissues: plant tissues

Compare the statements a and b
Statement a. Sclerenchyma cells do not have plasmodesmata
Statement b. Cell walls of some permanent tissues are heavily lignified.

  1. Statement a is correct and b is wrong

  2. Both the statements a and b are wrong

  3. Both the statements a and b are correct

  4. Statement a is wrong and b is correct
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Plasmodesmata are narrow channels that act as intercellular cytoplasmic bridges to facilitate communication and transport of materials between plant cells and are not found in Sclerenchyma cells. Sclerenchyma fibres are long and narrow and have thick lignified cell walls. They provide mechanical strength to the plant and allow for the conduction of water. Sclereids are specialised sclerenchyma cells with thickened, highly lignified walls with pits running through the walls.

So, the correct answer is 'Both the statements a and b are correct.'

Multiple choice botany plant tissues permanent tissues and their types simple permanent tissues tissues: plant tissues

Which of the following pair has lignin?

  1. Tracheid and collenchyma

  2. Sclerenchyma and sieve tube

  3. Sclerenchyma and trachea

  4. Parenchyma and endodermis
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sclerenchyma cells have thickened lignified walls, which make them strong and waterproof. The wall of the trachea is considerably thickened and lignified.  The characteristic thickening pattern, the thickness and the lignin content of the cell wall provide the vessel rigidity and make it resistant against the collapsing effect of the intense transpiration of the leaves.

So, the correct answer is 'Sclerenchyma and trachea.'

Multiple choice botany plant tissues permanent tissues and their types simple permanent tissues tissues: plant tissues

Tissue cells commonly found in fruit walls of nuts and pulp of some fruits like guava are called

  1. Fibres

  2. Sclereids

  3. Tracheids

  4. Vessels
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The spherical, oval or cylindrical cells with very narrow lumen; in sclerenchyma are called sclereids. Sclereids are usually found in the fruit walls of nuts, pulp of fruits like guava, pear and sapota; seed coats of legumes and leaves of tea. The gritty texture of pear or guava is because of sclereids.

So, the correct answer is 'Sclereids.'

Multiple choice botany plant tissues permanent tissues and their types simple permanent tissues tissues: plant tissues

Which of the following statements is true?

  1. Collenchyma occurs in layers below epidermis in monocot plants

  2. Xylem parenchyma cells are living, thin walled and lignified

  3. Sclerenchyma cells are usually dead and without protoplasts

  4. Companion cells are specialised sclerenchyma cells

  5. Phloem fibres are generally present in primary phloem
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Sclerenchyma tissue is composed of sclerenchyma cells, which are usually dead at maturity (i.e., have lost their protoplasts). They characteristically contain very thick, hard secondary walls lined with lignin; consequently, sclerenchyma provides additional support and strength to the plant body.

So, the correct answer is 'Sclerenchyma cells are usually dead and without protoplasts.'

Multiple choice botany plant tissues permanent tissues and their types simple permanent tissues tissues: plant tissues

Hard lignified thick-walled long and painted cells constitute

  1. Parenchyma

  2. Collenchyma

  3. Sclereids

  4. Sclerenchyma
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Sclerenchyma is thick walled dead lignified cells, they are hard and elastic. The sclerenchyma cells are divided into two groups namely fibers and sclereids. Sclerenchymatous fibers are branched/unbranched, long, hard, pointed cells with tapering ends, thick walls, and narrow lumen. 
So, the correct answer is 'Sclerenchyma.'