Tag: tissues: plant tissues

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Questions Related to tissues: plant tissues

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

Fibres and sclereids are the types of 

  1. Parenchyma

  2. Collenchyma

  3. Sclerenchyma

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

Sclerenchyma is the simple permanent tissue present in plants that performs the function of protection and support. Two types of sclerenchyma cells exist, fibers and sclereids. Fibres are long, narrow-lumen, thick-walled and dead cells that provide support to the internal structure of plants. Sclereids are polygonal cells that are found in fruit pulp. Parenchyma has think walled, polygonal and live cells while collenchyma has angular thickened polygonal cells.

So, the correct answer is 'Sclerenchyma'

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

Which one is not correct about sclerenchyma?

  1. Sclerenchyma fibres associated with xylem tissue are called wood fibres

  2. Sclerenchyma fibres associated with phloem tissue are called bast fibres

  3. Endocarp of coconut is rich is sclerenchyma fibres

  4. Brachysclereids are isodiametric and polygonal
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The exocarp is the thin outermost layer (or skin) of the fruit. The mesocarp is a thick husk composed of coarse brown fibers (coir). The endocarp is the hard, but relatively thin woody inner layer of a fruit that contains the endosperm. The endosperm is partly liquid (“coconut water”) and partly solid (fibrous white coconut “flesh” or “meat”, which adheres to the inner wall of the endocarp).

So, the correct answer is 'Endocarp of coconut is rich is sclerenchyma fibres.'

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

Sclerenchymatic tissues are dead have lignified thickened walls.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

There are four types of tissues present in the plants, namely vascular tissue, epidermal tissue, ground tissue and meristematic tissue. Ground tissue consists of parenchyma tissue, collenchyma tissue and sclerenchyma tissue. Parenchyma cells have thin primary walls and remain alive after they become mature. Collenchyma cells have thin primary walls with secondary thickening in some areas. They provide mechanical and structural support.

Sclerenchyma cells have lignified thickened secondary walls and are dead after maturation. They provide the main structural support to a plant.
Thus, the correct answer is 'True.'

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

Pear fruits are gritty due to occurrence of

  1. Tracheids

  2. Fibres

  3. Vessels

  4. Sclereids
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 and pears.

So, the correct answer is 'Sclereids.'

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

In which of the following sclerenchyma cells, the secondary cell walls are present

  1. The cells containing cytoplasm only

  2. The cells with protoplast

  3. Cells which are living at maturity

  4. Cells which are non-living at maturity
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sclerenchyma, in plants, support tissue composed of any of various kinds of hard woody cells. Mature sclerenchyma cells are usually dead cells that have heavily thickened secondary walls containing lignin. 

So, the correct answer is 'Cells which are non-living at maturity.'

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

Long plants are able to stand erect due to presence of

  1. Sclerenchyma

  2. Collenchyma

  3. Parenchyma

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

Since plants do not have bones for structure and support they must have cell walls around all of their cells. This leads to the need for very unique cells in plants. Sclerenchyma cells are specialized plant cells that exist to provide strength and support. They are present in all kinds of plants including grasses, trees, and flowering plants.

So, the correct answer is 'Sclerenchyma.'

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

Sclerenchyma fibres are absent in

  1. Protoxylem

  2. Protophloem

  3. Metaxylem

  4. None of the above
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

Protoxylem and protophloem that develop in the primary stage of plants need living cells to divide and form more tissues to grow and as sclerenchymatous cells are dead and not divide so they lack sclerenchyma cells.

So the correct option is 'Protoxylem and Protophloem'.

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

Choose the incorrect statement.

  1. Permanent tissues having all cells similar in structure and function are called simple tissue.

  2. Complex tissue has different types of cells performing different functions altogether.

  3. Secondary meristem is lateral meristem.

  4. The cells of permanent tissues divide further.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • Permanent tissues may be defined as a group of living or dead cells formed by meristematic tissue and have lost their ability to divide and have permanently placed at fixed positions in the plant body. Meristematic tissues that take up a specific role lose the ability to divide. This process of taking up a permanent shape, size and a function is called cellular differentiation. Cells of meristematic tissue differentiate to form different types of permanent tissues.
Simple tissues - A group of cells which are similar in origin; similar in structure and similar in function are called simple permanent tissue.
  • Complex permanent tissue - The complex tissue consists of more than one type of cells which work together as a unit. Complex tissues help in the transportation of organic material, water and minerals up and down the plants. That is why it is also known as conducting and vascular tissue.
  • Lateral Meristem - This meristem consists of cells which mainly divide in one plane and cause the organ to increase in diameter and growth. Lateral meristem usually occurs beneath the bark of the tree in the form of Cork Cambium and in vascular bundles of dicots in the form of vascular cambium. The activity of this cambium results in the formation of secondary growth.

So the correct option is 'The cells of permanent tissues divide further'.

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

Pits are found in the walls of

  1. Parenchyma

  2. Sclerenchyma

  3. Collenchyma

  4. Both A and C
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pits are thin portions of the cell wall. Through pits, the communication and exchange of fluid takes place between cells.  There is no deposition of lignin in this area. They are found in the walls of dead tissues with lignified cell walls like sclerenchyma and tracheids and vessels of xylem.

Thus, the correct answer is 'Sclerenchyma.'