Tag: botany

Questions Related to botany

Plant tissue responsible for stiffness in husk of coconut is 

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

  1. Sclerids

  2. Phloem cells

  3. Xylem fibres

  4. Sclerenchyma fibres

Show answer
Correct Option: D
Explanation:

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. 

So, the correct answer is option D.

Most of the plant tissues are ______ cells.

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

  1. Dead

  2. Alive

  3. Minute

  4. Large

Show answer
Correct Option: A
Explanation:

Since dead cells can provide mechanical strength as easily as live ones and need less maintenance.

What is the function of sclerenchymatous tissue?

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

  1. Flexibilty

  2. Tenderness

  3. Strength

  4. All of the above

Show answer
Correct Option: C
Explanation:

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?

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

  1. Parenchyma

  2. Collenchyma

  3. Both A and B

  4. Sclerenchyma

Show answer
Correct Option: D
Explanation:

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. 

Therefore, the correct answer is option D.

Which of the following tissues is dead at maturity?

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

  1. Sclerenchyma

  2. Collenchyma

  3. Parenchyma

  4. Both B and C

Show answer
Correct Option: A
Explanation:

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. 

Therefore, the correct answer is option A.

The cells of sclerenchyma can be classified as

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

  1. Fibres and fibriosis

  2. Ligaments

  3. Fibre and sclereids

  4. None of the above

Show answer
Correct Option: C
Explanation:

The chief mechanical tissue of the plant body composed of highly thick walled cell with little or no protoplasm is called as sclerenchyma.

The cells of sclerenchymatous cells can be classified as:
1. Fibres- Fibres are long, elongated sclerenchymatous cells with pointed ends.
2. Sclereids- Sclerenchymatous cells which are short and possess extremely thick lignified walls. 
Therefore, the correct answer is option C.

The sclerenchyma cells are thick walled due to the presence of

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

  1. Acetone

  2. Lignin

  3. Lipids

  4. None of the above

Show answer
Correct Option: B
Explanation:

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.

Therefore, the correct answer is option B.

Which cell is found in the husk of coconut?

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

  1. Xylem

  2. Sclerenchyma

  3. Collenchyma

  4. All of the above

Show answer
Correct Option: B
Explanation:

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.

Therefore, the correct answer is option B.

The osteosclereids are seen in

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

  1. Seed coat of crotalaria

  2. Seed coat of pisum

  3. Pulp of pyrus

  4. Petioles of banana

Show answer
Correct Option: B
Explanation:
  • 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?

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 parenchyma cells are living and thin walled and their cell walls are made up of lignin.

  4. The companion cells are specialized sclerenchymatous cells.

  5. Phloem fibres are generally present in the primary phloem.

Show answer
Correct Option: B
Explanation:

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.