Tag: ground tissues

Questions Related to ground tissues

Casparian strip occurs in:

botany plant tissue system ground tissue system ground tissues tissue systems

  1. Pericycle

  2. Endodermis

  3. Epidermis

  4. Cortex

Show answer
Correct Option: A
Explanation:
The innermost layer of cortex forms endodermis, which has compactly arranged barrel shaped cells. The primary thin walled endodermis shows suberin deposition in form of bands or strips that run around the radial and end walls of the cells and forms Casparian strips. 
Thus, the correct answer is option B.

Cortex is formed from

botany plant tissue system ground tissue system ground tissues tissue systems

  1. Cambium

  2. Procambium

  3. Ground meristem

  4. Protoderm

Show answer
Correct Option: C
Explanation:
  • In plants, the cortex forms the outermost layer of the stem or root which are surrounded by the epidermis layer. 
  • Cortex is made up of differentiated cells which are large and thin-walled parenchyma cells.
  • The outer cortical cells of the cortex have irregularly thickened collenchyma cells.
  • The parenchyma and collenchyma cells are a part of the ground tissue system.
So, the correct answer is 'Ground meristem'

Ground tissue having differentiated concentric layers is found in

botany plant tissue system ground tissue system ground tissues tissue systems

  1. Dicot leaf

  2. Monocot leaf

  3. Dicot stem

  4. Monocot stem

Show answer
Correct Option: C
Explanation:

A. Dicot leaf – Mesophyll is the ground tissue. It is differentiated into palisade and spongy parenchyma.

B. Monocot leaf – Mesophyll is the ground tissue. It is not differentiated. It shows only spongy parenchyma.

C. Cortex is the ground tissue in dicot stem. It is differentiated into hypodermis, general cortex and endodermis.

D. Monocot stem – the region present inner to the hypodermis is ground tissue. It shows scattered arrangement of vascular bundles.

So, the correct option is ‘Dicot stem’.

Periblem forms

botany plant tissue system ground tissue system ground tissues tissue systems

  1. Endodermis

  2. Cortex

  3. Both A and B

  4. Epidermis

Show answer
Correct Option: C
Explanation:
  • The shoot apical meristem (SAM) of a plant form three distinct meristematic zones called the Histogens.
  • These histogens are present at the growing shoot tip or root tip.
  • These tips consist of three histogens based on the type of cells they form.
  • Each of these histogens gives rise to tissues which are different from one another- dermatogen, periblem, plerome (principle tissues)
1) The dermatogen or the outer layer gives rise to the epidermis.
2) The periblem or middle layer gives rise to the cortex and the endodermis (compact living cells with hydrophobic substances) which is the innermost layer of the cortex.
3)The plerome or the inner layer gives rise to vascular tissues.
So, the correct answer is 'Both A and B'.

In cucurbita, hypodermis is formed of

botany plant tissue system ground tissue system ground tissues tissue systems

  1. Sclerenchyma

  2. Collenchyma

  3. Parenchyma

  4. Aerenchyma

Show answer
Correct Option: B
Explanation:

The cortical region present below epidermis is called ‘ Hypodermis’. It is made up of collenchyma in dicotyledons and sclerenchyma in monocotyledons.

So, the correct option is ‘Collenchyma’.

What is correct about monocot stem?

botany plant tissue system ground tissue system ground tissues tissue systems

  1. Hypodermis is sclerenchymatous, vascular bundles are closed, phloem parenchyma is absent

  2. Hypodermis is sclerenchymatous, vascular bundles are open, phloem parenchyma is absent

  3. Hypodermis is collenchymatous, vascular bundles are closed, phloem parenchyma is present

  4. Hypodermis is sclerenchymatous, vascular bundles are closed, phloem parenchyma is present

Show answer
Correct Option: A
Explanation:

A. The hypodermis is sclerenchymatous, vascular bundles are closed, phloem parenchyma is absent – True in. monocot stem.

B. The hypodermis is sclerenchymatous, vascular bundles are open, phloem parenchyma is absent – False because vascular bundles are closed in monocot stem.

C. Hypodermis is collenchymatous, vascular bundles are closed, phloem parenchyma is present – false, because hypodermis is sclerenchymatous and phloem parenchyma is absent in monocot stem

D. Hypodermis is sclerenchymatous, vascular bundles are closed, phloem parenchyma is present – false, because, phloem parenchyma is absent in monocot stem.

So, the correct option is ‘Hypodermis is sclerenchymatous, vascular bundles are closed, phloem parenchyma is absent’.

Cellular layer covering plant organs is

botany plant tissue system ground tissue system ground tissues tissue systems

  1. Epidermis

  2. Hypodermis

  3. Cuticle

  4. Endodermis

Show answer
Correct Option: A
Explanation:
A. The epidermis is the outermost protective layer of cells which cover all the plant organs which act as a barrier against mechanical injury and also prevents water loss and infection.
B. Hypodermis consists of a layer of cells immediately that is present below the epidermis which is strengthened to provide protection and also store water.
C. The cuticle is a protective layer which is impervious to water and covers the epidermal cells of leaves and plant organs to prevent water loss.
D. Endodermis is the innermost layer of cortex which is made of compact living cells and is surrounded by rings that are impregnated with hydrophobic substances to prevent the apoplastic flow of water.
So, the correct answer is 'Epidermis'.

Periblem produces

botany plant tissue system ground tissue system ground tissues tissue systems

  1. Cortex

  2. Pericycle

  3. Vascular strand

  4. Both B and C

Show answer
Correct Option: A
Explanation:
  • The shoot apical meristem (SAM) of a plant form three distinct meristematic zones called the histogens (histogen theory).
  • These histogens are present at the growing shoot tip or root tip.
These tips consist of three histogens based on the type of cells they form.
  • Each of these histogens gives rise to tissues which are different from one another- dermatogen, periblem, plerome (principle tissues)
1) The dermatogen or the outer layer gives rise to the epidermis.
2) The periblem or middle layer gives rise to the cortex and the endodermis (compact living cells with hydrophobic substances) which is the innermost layer of the cortex.
3)The plerome or the inner layer gives rise to vascular tissues
  • So, the correct answer is 'Cortex'

Cortex is the region found between

botany plant tissue system ground tissue system ground tissues tissue systems

  1. Endodermis and vascular bundles

  2. Epidermis and stele

  3. Pericycle and endodermis

  4. Endodermis and pith

Show answer
Correct Option: B
Explanation:

In internal structure of root and dicot stem, the region appears between epidermis and stele is cortex. In roots, cortex includes general cortex and endodermis, where as in dicot stems, cortex includes, hypodermis, general cortex and endodermis. In roots, cortex is concerned in the radial conduction of water, where as in dicot stems, it is concerned in the storage of food materials.

So, the correct option is ‘Epidermis and stele’.

Secondary cortex is derived from 

botany plant tissue system ground tissue system ground tissues tissue systems

  1. Intercalary meristem

  2. Protoderm

  3. Procambium

  4. Phellogen

Show answer
Correct Option: D
Explanation:

  • The secondary cortex which is also known as phelloderm is produced by phellogen or cork cambium. 
  • The cork cambium or the phellogen is a lateral meristem which is responsible for the formation of periderm.
  • The cells of the periderm which grows inward are known as phelloderm while the cells that grow outward is known as phellem or cork.
  • The periderm layer has three distinct layers:-
1) phelloderm – is made up of living parenchyma cells which are present on the inner side of the cork cambium.
2) phellogen or cork cambium- gives rise to periderm
3) phellem or cork is made up of dead cells which have air-filled protective tissues.
So, the correct answer is 'Phellogen'.