Tag: botany

Quizzes (264) Questions (5276)

Questions Related to botany

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

Which of the following are simple tissues?

  1. Parenchyma, xylem and phloem

  2. Parenchyma, collenchyma and sclerenchyma

  3. Parenchyma, xylem and collenchyma

  4. Parenchyma, xylem and sclerenchyma
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Parenchyma, collenchyma and sclerenchyma are called as simple tissues as they are made up of similar kind of cells. Vascular tissue is a complex tissue because it is heterogeneous in nature with different types of cells. The chief elements are xylem, phloem and pericycle.
Thus, the correct answer is option B.

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

The tissue which has dead cells in the functional state is

  1. Collenchyma

  2. Sclerenchyma

  3. Parenchyma

  4. Phloem
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Sclerenchyma cells are dead cells at maturity and have a very thick cell wall due to the deposition of lignin. 
  • They are either present in the form of fibres or sclereids (stone cells).
  • They are located in the leaf veins, hard coverings of the seeds and vascular bundle. 
  • Its main function include- 1) provide rigidity and mechanical support to the plant body, 2) It also makes the plant stiff and hard.
  • So, the correct answer is 'Sclerenchyma'.
Multiple choice botany plant tissues permanent tissues and their types simple permanent tissues tissues: plant tissues

Lignin is the main constituent of

  1. Woody tissues

  2. Growing tissues

  3. Phloem

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

Fibres are usually long, spindle shaped structures, with tapering or blunt ends. Secondary thickening by lignin occur in 90% of the area of the cell. Fibres are grouped into xylary fibres and extraxylary fibres. Xylary fibres are also called wood fibres and are the longest among xylem elements. 
Thus, the correct answer is option A.

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

Long pointed sclerenchyma cells are

  1. Fibres

  2. Tracheae

  3. Wood parenchyma

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

Sclerenchyma cells occur in many different shapes and sizes, but two main types occur: fibres and sclereids. Fibres are greatly elongated cells whose long, tapering ends interlock, thus providing maximum support to a plant. They often occur in bundles or strands and can be found almost anywhere in the plant body, including the stem, the roots, and the vascular bundles in leaves

So, the correct answer is 'Fibres'

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

A tissue present in guava pulp and tea leaves is

  1. Sclereid

  2. Chlorenchyma

  3. Collenchyma

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

  • Sclereids or stone cells are a type of reduced sclerenchyma cells.
  • These stone cells form hard structures such as seed coats and nut shells and provide support to the soft tissues.
  • Their cell wall is highly thickened and lignified which form small bundles of durable layers of tissues.
  • The presence of numerous stones cells that makes pear and guava have a gritty texture is brachysclereids (unbranched, short and isodiametric with pits).
  • The stone cells in tea leaves that make it tougher are astrosclereids (branched as star-shape).
So, the correct answer is 'Sclereid'

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

Which of the following tissues has dead cells?

  1. Parenchyma

  2. Sclerenchyma

  3. Collenchyma

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

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

Stereome is a

  1. Vascular tissue

  2. Phloem

  3. Collenchyma

  4. Mechanical tissue
Reveal answer Fill a bubble to check yourself
D Correct answer
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’.

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

Which of the following statements is true?

  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.
Reveal answer Fill a bubble to check yourself
B Correct answer
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.'
Multiple choice botany plant tissues permanent tissues and their types simple permanent tissues tissues: plant tissues

Intercellular spaces are absent in sclerenchymatous tissues because___________.

  1. They are stratified.

  2. They are lignified.

  3. They are classified.

  4. They are columnar.
Reveal answer Fill a bubble to check yourself
B Correct answer
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.