Tag: plant tissues

Questions Related to plant tissues

Which of the following tissues has dead cells?

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

  1. Parenchyma

  2. Sclerenchyma

  3. Collenchyma

  4. Epithelium

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Correct Option: B
Explanation:

Parenchyma cells have thin cellulosic cell walls. Collenchyma cells have thicker cellulosic walls and also may have pectin deposition on corners. Sclerenchyma cells have thick lignified cell walls and are dead at maturity and provide protection to the different parts of the body. Epithelial cells are thin-walled and living.

So, the correct answer is option B.

Sclereids belong to

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

  1. Collenchyma

  2. Xylem

  3. Sclerenchyma

  4. Sclerenchyma fibres.

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Correct Option: C
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. 

So the answer is 'Sclerenchyma'. 

Stereome is a

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

  1. Vascular tissue

  2. Phloem

  3. Collenchyma

  4. Mechanical tissue

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Correct Option: D
Explanation:

Vascular tissues concerned in the transportation of water, mineral and food.

Phloem is a vascular tissue or conducting tissue, meant for the translocation of organic solutes or food.

Collenchyma is a simple permanent living mechanical tissue, provides elasticity to the young stems.

Mechanical tissues are the rigid cellular tissues, provides elasticity, flexibility to the different parts of the plant body. These are called stereome. So, the correct answer is 'Mechanical tissue’.

Which of the following statements is true?

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

  1. The collenchyma occurs in layers below the epidermis in monocotyledonous plants.

  2. Sclerenchyma cells are usually dead and without protoplasts.

  3. Xylem parenchyama cells are living and thin walled and their cells walls are made up for lignin.

  4. The companion cells are specialised scierenchy matous cells.

Show answer
Correct Option: B
Explanation:
Sclerenchyma consists of long, narrow cells with thick and lignified cell walls having few pits. It is dead and without protoplasts. On the basis of structure, origin and development, sclerenchyma may be either fibres or sclereids. The fibres are thick-walled, elongated and pointed cells. The sclereids are spherical, oval or cylindrical, highly thickened dead cells with very narrow lumen. These are found in the fruit walls of nuts; pulp of fruits like guava, pear and sapota; seed coats of legumes and leaves of tea. Sclerenchyma provides mechanical support to organs.
Thus, the correct answer is 'Sclerenchyma cells are usually dead and without protoplasts.'

Intercellular spaces are absent in sclerenchymatous tissues because___________.

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

  1. They are stratified.

  2. They are lignified.

  3. They are classified.

  4. They are columnar.

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Correct Option: B
Explanation:

Walls of sclerenchyma cells are lignified, which make them thick. Due to this, are no intercellular spaces between them. Hence, option B is correct.  

Which of the following tissues has dead cells with thick and lignified cell walls, having a few or numerous pits?

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

  1. Sclerenchyma

  2. Collenchyma

  3. Phloem

  4. None of the above

Show answer
Correct Option: A
Explanation:

A. Sclerenchyma is known as the supporting tissue of the plants which make the plant hard and stiff as their cell wall is made up of cellulose, hemicellulose and lignin.

B. Collenchyma consists of cells with irregular and thickened cell walls which provide structural support to the plants.
C. Phloem tissues help to conduct food made in the leaves to all other parts of the plant and it consists of sieve tubes, companion cells, phloem fibres, and phloem parenchyma cells.
So, the correct answer is 'Sclerenchyma'.

It is difficult to pull out the husk of a coconut tree due to _____________.

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

  1. Presence of parenchyma.

  2. Presence of sclerenchyma.

  3. Presence of collenchyma.

  4. Presence of aerenchyma.

Show answer
Correct Option: B
Explanation:

Parenchyma cells are thin-walled, flexible and loosely packed cells. They are often alive at maturity. Their shape changes as per function. They are filler tissue in soft parts of a plant. 
Collenchyma cells are thin-walled with some areas of secondary thickening. They provide extra structural support and flexibility to plant. Coconut husk is not made of collenchymatous cells. 
In many aquatic plants, parenchyma cells have large air cavities to give buoyancy to the plant and enable them to float in water. Such parenchyma cells are called as aerenchyma.
Sclerenchyma is dead, long, thin narrow cells. Walls of sclerenchyma cells are lignified, which make them thick. This tissue makes the plant hard and stiff. Coconut husk is very hard and is made of such thickened, lignified cells. Such cells make it very hard to pull out the coconut husk.

Choose the correct answer from the alternatives given.
Sclerenchymatous cells in their cell walls have large percentage of:

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

  1. silica

  2. lignin

  3. pectin

  4. cellulose

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Correct Option: B
Explanation:

Answer B: Lignin

Sclerenchyma is composed of dead cells with extremely thick cell walls that make up to 90% of the whole cell volume. Their walls consist of cellulose and/or lignin.

               

We get a crunchy and granular feeling, when we chew pear fruit because of the

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

  1. Presence of stone cells (sclerenchyma)

  2. Presence of stone cells (parenchyma)

  3. Presence of stone cells (collenchyma)

  4. Presence of stone cells (aerenchyma)

Show answer
Correct Option: A
Explanation:

  • Parenchyma cells are alive, thin-walled cells. They are present in soft parts of the plant. But pear fruit has hard parts inside, which give it a gritty texture. Therefore, option B is incorrect. 
  • Collenchyma cells are thin-walled with some areas of secondary thickening. They provide extra structural support and flexibility to plant. Therefore, option C is incorrect.
  • Aerenchyma cells are present in an aquatic plant. Such cells have large air cavities, which enable the plant to float in water. 
  • Sclereid is a reduced form of sclerenchyma, which has thickened lignified walls. In pear fruit, sclereid cells are present in bundles, which give a gritty texture to the fruit. Such cells are also called "stone cells" because of their hardness.

So, the correct answer is option A.

Which of these cells in a plant is apt to be nonliving?

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

  1. Epidermal

  2. Sclerenchyma

  3. Collenchyma

  4. P

    arenchyma

Show answer
Correct Option: B
Explanation:

the sclerenchyma tissue is present in stems, around vascular bundles, in the veins of leaves and in the hard covering of seeds and nuts. It is the tissue which makes the plant hard and stiff due to the presence of lignin in the cell wall. The cells of this tissue are dead. So, the correct answer is "sclerenchyma".