Tag: epidermal tissue system

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

Scaly bark occurs in

  1. Eucalyptus

  2. Betula

  3. Psidium

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

Scaly bark refers to the type of bark of trees where the stem has discontinuous, overlapping successive periderms and patches of the bark are shed. This is generally found in Eucalyptus squamosa growing in and around Sydney.

So, the correct answer is option A.

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

Epidermal cells are

  1. Guard cells

  2. Root hairs

  3. Trichomes

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Epidermal cells make the outermost covering of primary plant body. They are compactly arranged, barrel-shaped parenchyma cells with no or little intercellular spaces. 

Each stomatal pore is surrounded by two guard cells that assist in stomatal opening driven by turgidity of guard cells. The guard cells are the only epidermal cells with unevenly thickened walls and chloroplasts.  
A root hair cell is a tubular unicellular extension of epiblema, the epidermis of root. It has a nucleus and large vacuole with lots of mitochondria in the cytoplasm and serves to absorb water and mineral salts by osmosis and active transport respectively. 
Trichomes are the hairy outgrowth of epidermis that may be unicellular or multicellular, live or dead and are mostly present on leaf surfaces.

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

Cell wall is impermeable to water and deposition of suberin occurs in

  1. Bark

  2. Cork

  3. Bast

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

Suberin is a waterproofing waxy layer. Its main function is to serve as a barrier to movement of water and solutes. A mature cork cell is nonliving and has cell walls that are composed of a waxy substance that is highly impermeable to gasses and water, called as suberin. Thus, option B is correct. 

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

The outermost primary meristem gives rise to

  1. Epidermis

  2. Procambium

  3. Ground meristem

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The apical meristem has upper promeristem and lower primary meristem. Primary meristem differentiates into three distinct meristematic regions, the outermost protoderm, middle ground meristem, and innermost procambium. The protoderm gives rise to epidermal tissue system, ground meristem forms cortex/ground tissue system and procambium forms vascular tissue system (xylem, phloem, and cambium). 

So, the correct answer is option is A.

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

Which of the following plant shows multiple epidermis?

  1. Palm

  2. Ficus

  3. Croton

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

Epidermis is the outermost protective layer which minimizes the loss of water by transpiration. Some plants, like Ficus elastica and Peperomia, which have periclinal cellular division within the protoderm of the leaves, have an epidermis with multiple cell layers.

So, the correct answer is option B.

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

The cells are chlorophyllous, fewer in number, unique in shape and inner walls thick. The description fits into

  1. Guard cells

  2. Subsidiary cells

  3. Passage cells

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

Each stomatal pore is surrounded by two guard cells that assist in stomatal opening driven by turgidity of guard cells. The only epidermal cells with unevenly thickened walls and chloroplasts are the guard cells, they are kidney shaped in dicots and dumbell shaped in monocots.

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

Cuticle is secreted by

  1. Epidermis

  2. Endodermis

  3. Both A and B

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

Epidermis is the part of epidermal tissue system and forms the outer protective covering of primary plant body. The epidermal cells secrete cutin, which is a hydrophobic substance and prevents water loss and desiccation. The cutin forms a covering outside the epidermal cells in all plants parts except root.

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. 
Hypodermis refers to 5-7 layers of cortical cells present just beneath the epidermis.

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

The wall of cork cells are thickened by the deposition of________________

  1. Cutin

  2. Suberin

  3. Lignin

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

  • Cork cells are dead and have cell walls composed of a waxy substance "suberin", which is highly impermeable to gases and water. This substance prevents water loss from stem. Therefore, option B is correct.

Multiple choice biology multicellular structure: tissue defense mechanism in plants epidermal tissue system kinds of plant tissue permanent tissues and their types

Identify the incorrect statements out of the following and select the correct option.
(i)  Epidermal tissue system forms the outermost covering of various plant organs.
(ii)  Ground tissue synthesizes organic compounds and controls photosynthesis with the help of collenchyma cells.
(iii)  Epidermal tissue of leaves is called mesophyll which is made up of two types of cells. palisade and spongy.
(iv)  Ground tissue system forms interior of plant organs with exclusion of dermal and vascular systems.

  1. (i) and (ii)

  2. (ii) and (iii)

  3. (i) and (iv)

  4. (i), (ii) and (iv)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The ground tissue system synthesizes organic compounds, supports the plant and provides storage for the plant. It is mostly made up of parenchyma cells. Parenchyma cells synthesize and store organic products in a plant. Parenchyma cells in leaves control photosynthesis. Collenchyma cells have a support function in plants, particularly in young plants. Mesophyll tissue is the photosynthetic parenchyma cells that lie between the upper and lower epidermis layers of a leaf. In dicotyledonous leaves, there are two types of mesophyll cells; palisade mesophyll and spongy mesophyll.

So, the correct answer is option A.

Multiple choice biology multicellular structure: tissue defense mechanism in plants epidermal tissue system kinds of plant tissue permanent tissues and their types

In desert plants, the epidermis has a thick waterproof coating of____________

  1. Cutin

  2. Suberin

  3. Elastin

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

  • In deserts, water is scarce and saving water is a major step which plants of this region have to undertake. So in many of the desert plants like Yucca, creosote, cactus, etc, the epidermis has a thick waxy coating of cutin. 
  • This restricts the loss of water through transpiration. In desert plants, the epidermis has a thick waterproof coating that is not made of suberin, elastin or chondrin. 

Therefore, the correct answer is option A.