Tag: tissues: plant tissues

Questions Related to tissues: plant tissues

In sclerenchyma, wall is

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

  1. Lignified

  2. Suberised

  3. Pectinised

  4. Cutinised

Show answer
Correct Option: A
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.'

Common between sclerenchyma and collenchyma is

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

  1. Material transport

  2. Conduction of water and minerals

  3. Providing buoyancy

  4. Providing support

Show answer
Correct Option: D
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.'

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

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

  1. Epidermal cells

  2. Guard cells

  3. Sclerenchyma cells

  4. Accessory cells

Show answer
Correct Option: C
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.'

Which is not true regarding sclerides?

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

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

  2. Stone cells

  3. Constituent of sclerenchyma

  4. Group of living cells

Show answer
Correct Option: D
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.'

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.

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

  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

Show answer
Correct Option: C
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.'

Which of the following pair has lignin?

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

  1. Tracheid and collenchyma

  2. Sclerenchyma and sieve tube

  3. Sclerenchyma and trachea

  4. Parenchyma and endodermis

Show answer
Correct Option: C
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.'

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

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

  1. Fibres

  2. Sclereids

  3. Tracheids

  4. Vessels

Show answer
Correct Option: B
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.'

Which of the following statements is true?

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

  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

Show answer
Correct Option: C
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.'

Hard lignified thick-walled long and painted cells constitute

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

  1. Parenchyma

  2. Collenchyma

  3. Sclereids

  4. Sclerenchyma

Show answer
Correct Option: D
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.'

Septate sclereides occur in Pereskia in _____________.

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

  1. Pith and cortex

  2. Xylem

  3. Phloem

  4. Pericycle

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Correct Option: C