Tag: defense mechanism in plants

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Multiple choice botany plant growth defense mechanism in plants epidermal tissue system permanent tissues and their types

The epidermal, ground and vascular systems of plants are developed, respectively, from

  1. Protoderm, ground meristem and procambium

  2. Protoderm, procambium and ground meristem

  3. Ground meristem, procambium and protoderm

  4. Procambium, protoderm and ground meristem
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Three concentric regions of primary meristematic tissues develop immediately behind the apical meristem . These primary meristems produce the different tissues of the plant body: the outermost protoderm differentiates into the epidermis, a tissue that protects the plant; the adjacent ground meristem differentiates into the central ground tissues (the pith and cortex); and the procambium differentiates into the vascular tissues (the xylem, phloem, and vascular cambium).

So, the correct option is A.( Protoderm, ground meristem and procambium )

Multiple choice biology tissues, organs, organ system, organism defense mechanism in plants epidermal tissue system permanent tissues and their types

Which of the following is an epidermal cell?

  1. Guard cells

  2. Root hairs

  3. Trichome

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • Epidermal cells from the outer covering or surface which is mainly involved in protection and secretion. Guard cells, root hairs, and trichome are all modification of the epidermal cells.
(i) Root hair
Structure: 
  • Unicellular hairs are the extensions of an epidermal cell of roots in the root hair zone.
Function:
It increases the surface area for absorption of water and minerals.
(ii) Epidermal appendages
Structure:
  • These are called trichomes and are epidermal cell modifications. There may be unicellular or multicellular.
Functions:
Some perform for stinging produces and some glandular secretions.
(iii) Guard cell
  • Structure:
These are bean-shaped cells present on the epidermis of the leaf.
Functions:
These help in gaseous exchange and transpiration.

Multiple choice botany plant tissues defense mechanism in plants epidermal tissue system permanent tissues and their types

How many tissues are present within dicot root having cortex, endodermis, pericycle, pith, xylem and phloem?

  1. $5$
  2. $6$
  3. $3$
  4. $12$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Dicot roots have xylem in the center of the root and phloem outside the xylem. Phloem is surrounded by the pericycle followed by endodermis. Pericycle is made up parenchyma cells and sclerenchyma cells.
The cortex is the outer most layer of the dicot root. Cortex is made up of epithelium cells. Pith is absent in it. Hence, total 5 types of tissues are present within dicot root.

Thus, the correct answer is '5.'

Multiple choice botany plant tissues defense mechanism in plants epidermal tissue system permanent tissues and their types

Which of the following are simple tissues?

  1. Parenchyma, xylem and phloem

  2. Parenchyma, collenchyma and sclerenchyma

  3. Parenchyma, xylem and sclerenchyma

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

Parenchyma, collenchyma, and sclerenchyma are called simple tissues. And they are made up of similar kinds of cells. Vascular tissues are complex tissue as it is heterogeneous in nature with different types of cells. The main elements are the xylem, phloem and pericyclic.

Thus, the correct option is B.

Multiple choice botany plant tissues defense mechanism in plants epidermal tissue system permanent tissues and their types

Which one of the following can be considered to be a dead mechanical tissue?

  1. Aerenchyma

  2. Collenchyma

  3. Parenchyma

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

Sclerenchyma tissue is composed of dead cells with heavily lignified secondary cell walls, providing mechanical strength and support to plant organs. In contrast, parenchyma, collenchyma, and aerenchyma are generally living tissues at maturity.

Multiple choice botany plant tissues defense mechanism in plants epidermal tissue system permanent tissues and their types

Match the following and choose the correct option from below.

A. Cuticle (i) Guard cells
B. Bulliform cells (ii) Single layer
C. Stomata (iii) Waxy layer
D. Epidermis (iv) Empty colourless cell

  1. A-(iii), B-(iv), C-(i), D-(ii)

  2. A-(i), B-(ii), C-(iii), D-(iv)

  3. A-(iii), B-(ii), C-(iv), D-(i)

  4. A-(iii), B-(ii), C-(i), D-(iv)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A. Cuticle: It is a fatty substance( cutin) deposited over the surface of epidermal cells in the form of a separate layer. Usually, the cuticle is covered with wax which may be deposited in the form of granules, rods, crusts or viscous semi-liquid masses.

B. Bulliform cells: They are thin-walled and contain big vacuoles filled with water. They play an important role in folding and unfolding of leaves.
C. Stomata: A typical stoma is microscopic and usually consists of two kidney-shaped guard cells surrounding a pore.
D. Epidermis: The epidermis of most of the plant is single-layered (uniseriate) but in some cases, it may be more than one layer thick (multiseriate).
So, the correct answer is 'A-(iii), B- (iv), C-(i), D-(ii)'.

Multiple choice botany tissues defense mechanism in plants epidermal tissue system permanent tissues and their types

Minerals salts are translocated through (i) along with the (ii) stream of water, which is pulled up through the plant by transpirational pull.
Fill up the blanks in the given statement and select the correct option.

  1. (i) - Xylem, (ii) - ascending

  2. (i) - Xylem, (ii) - descending

  3. (i) - Phloem, (ii) - ascending

  4. (i) - Phloem, (ii) - descending
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mineral salts are transported from the roots to the rest of the plant through the xylem tissue. This movement is part of the ascending stream of water driven by transpirational pull.

Multiple choice biology plant tissues defense mechanism in plants epidermal tissue system permanent tissues and their types

The living mechanical tissue

  1. Parenchyma

  2. Xylem

  3. Collenchyma

  4. Sclerenchyma
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
The living mechanical tissue in plants is collenchyma. It is found in young parts of the plant body. It provides mechanical strength to the young plant parts. It is not found in underground parts and monocots.
So, the correct option is 'Collenchyma'