Tag: ground tissue system

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Multiple choice botany plant tissue system ground tissue system ground tissues tissue systems

Pith and cortex belongs to 

  1. Epidermis

  2. Ground tissue

  3. Vascular tissue

  4. Bundle sheath
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In the stem, the pith and the cortex make up the ground tissue. The pith is located within the cylinder of vascular tissue, where it often exhibits a spongy texture because of the presence of large intercellular air spaces. If the growth of the pith fails to keep up with that of the surrounding tissues, the pith may degenerate, producing a hollow stem. In general, roots lack piths, although there are exceptions to this rule. 

In contrast, the cortex, which is located between the epidermis and the vascular cylinder, is present in both stems and roots. 

Multiple choice botany plant tissue system ground tissue system ground tissues tissue systems

Casparian strip occurs in

  1. Pericycle

  2. Endodermis

  3. Epiblema

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

Casparian strip is a band of cell wall material deposited on the radial and transverse walls of the endodermis. It is chemically different from the rest of the cell wall. Casparian strip is made of suberin and sometimes lignin. It blocks the passive flow of materials, such as water and solutes into the stele of a plant. 

Multiple choice botany plant tissue system ground tissue system ground tissues tissue systems

Casparian strips are characteristic feature of endodermis, made up of

  1. Cutin

  2. Pectin

  3. Suberin

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

In plant anatomy, the Casparian strip is a band of cell wall material deposited on the radial and transverse walls of the endodermis and is chemically different from the rest of the cell wall the cell wall.

The Casparian strip is made up of suberin and sometimes lignin. It blocks the passive flow of materials, such as water and solutes into the stele of a plant. Thus, option C is correct.

Multiple choice botany plant tissue system ground tissue system ground tissues tissue systems

Casparian strips occur in

  1. Longitudinal and radial walls of epidermal cells

  2. Longitudinal walls of xylem

  3. All walls of endodermis

  4. Radial and tangential walls of endodermis
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Casparian strip is a band of cell wall material deposited on the radial and tangential walls of the endodermis and is chemically different from the rest of the cell wall, the cell wall being made of lignin and without suberin, whereas the Casparian strip is made of suberin and sometimes lignin. It blocks the passive flow of materials such as water and solutes into the stele of a plant. It varies in width and is often much narrower than the wall in which it occurs. It is typically located closer to the inner tangential wall than the outer. 

Multiple choice botany plant tissue system ground tissue system ground tissues tissue systems

Passage cells are thin-walled cells found in

  1. Central region of style through which the pollen tube grows towards the ovary

  2. Endodermis of roots facilitating rapid transport of water from cortex to pericycle

  3. Phloem elements that serve as entry points for substances for transport to other plants parts

  4. Testa of seeds to enable emergence of growing embryonic axis during seed germination
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Passage cells are endodermal cells of older roots, which have retained thin walls and Casparian strips rather than becoming suberized and waterproof like the other cells around them, to continue to allow some symplastic flow to the inside. Passage cells function to allow transfer of solutes, such as calcium and magnesium into the stele, in order to eventually reach the transpiration system. 

Multiple choice botany plant tissue system ground tissue system ground tissues tissue systems

Periblem gives rise to

  1. Epidermis

  2. Cortex

  3. Cortex and endodermis

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

In the histogen theory Henstein divided the shoot apex into various zones. Each zone consists of a group of initial cells and called as histogen or a tissue builder.

The major histogens of the stem and roots are -(a) the dermatogen, a meristematic external layer, (b) the plerome, a central core and (c) the periblem, the region between the two. 
The dermatogen gives rise to the epidermis, the prerome to the primary vascular bundles and the periblem develops into the cortex and endodermis.

Multiple choice botany plant tissue system ground tissue system ground tissues tissue systems

Pith and cortex belongs to

  1. Epidermis

  2. Ground tissue

  3. Vascular tissue

  4. Bundle sheath
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Epidermis is the part of epidermal tissue system and forms the outer protective covering of primary plant body. 

All tissues of a plant body except epidermal and vascular tissues system makes ground tissue, which can be intrastelar and extrastelar tissue, depending on its position with respect to stele. 
Cortex and endodermis constitute extra stelar ground tissue, while pericycle, pith and medullary ray constitute the intra stelar ground tissue. 
Vascular tissues system comprise of xylem, phloem and cambium. Thus, the correct answer is option B.

Multiple choice botany plant tissue system ground tissue system ground tissues tissue systems

Endodermis mainly

  1. Acts as a water tight jacket

  2. Provides protection

  3. Maintains rigidity

  4. Help in transpiration
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The endodermis is the central, innermost layer of cortex in some land plants. It is made of compact living cells surrounded by an outer ring of endodermal cells that are impregnated with hydrophobic substances (Casparian Strip) to restrict apoplastic flow of water to the inside. The endodermis is the boundary between the cortex and the stele. In many seedless vascular plants, the endodermis is a distinctly visible layer of cells immediately outside the vascular cylinder (stele) in roots and shoots. In most seed plants, especially woody types, an endodermis is absent from the stems but is present in roots. 

The endodermis helps regulate the movement of water, ions and hormones into and out of the vascular system. It may also store starch, be involved in perception of gravity and protect the plant against toxins moving into the vascular system. Thus, option A is correct. 

Multiple choice botany plant tissue system ground tissue system ground tissues tissue systems

Periblem gives rise to

  1. Epidermis

  2. Cortex

  3. Pericycle

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

Histogen theory by Hanstein states that shoot apical meristem consists of three distinct zones- 

i) Dermatogen (external layer), which form outer covering of all organ of plant. 
ii) Periblem (middle layer) gives rise to cortex and endodermis. 
iii) Plerome (central layer) form pith and primary vascular bundle. Thus, option B is correct.

Multiple choice botany plant tissue system ground tissue system ground tissues tissue systems

Which of the following does not contain pith?

  1. Siphonostele

  2. Protostele

  3. Eustele

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

Protostele is the most primitive type of stele with central xylem surrounded by phloem and pericycle. Pith is absent in them. Medullation (appearance of pith) of a protostele with central pith is called as siphonostele and thus has central pith surrounded by xylem, phloem and pericycle. Separation of vascular strands by parenchyma in siphonostele give rise to eustele. Thus, the correct answer is option B.