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 pair has lignin?

  1. Tracheid and collenchyma

  2. Sclerenchyma and sieve tube

  3. Sclerenchyma and trachea

  4. Parenchyma and endodermis
Reveal answer Fill a bubble to check yourself
C Correct answer
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.'

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

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

  1. Fibres

  2. Sclereids

  3. Tracheids

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

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

Which of the following statements is true?

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
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.'

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

Hard lignified thick-walled long and painted cells constitute

  1. Parenchyma

  2. Collenchyma

  3. Sclereids

  4. Sclerenchyma
Reveal answer Fill a bubble to check yourself
D Correct answer
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.'
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.'