Tag: permanent tissues and their types

Questions Related to permanent tissues and their types

Scaly bark occurs in

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

  1. Eucalyptus

  2. Betula

  3. Psidium

  4. None of the above

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Correct Option: A
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.

Epidermal cells are

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

  1. Guard cells

  2. Root hairs

  3. Trichomes

  4. All of the above

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Correct Option: D
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.

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

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

  1. Bark

  2. Cork

  3. Bast

  4. Xylem

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Correct Option: B
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. 

The outermost primary meristem gives rise to

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

  1. Epidermis

  2. Procambium

  3. Ground meristem

  4. All of the above

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Correct Option: A
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.

Which of the following plant shows multiple epidermis?

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

  1. Palm

  2. Ficus

  3. Croton

  4. Cucurbita

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Correct Option: B
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.

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

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

  1. Guard cells

  2. Subsidiary cells

  3. Passage cells

  4. Bulliform cells

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Correct Option: A
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.

Cuticle is secreted by

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

  1. Epidermis

  2. Endodermis

  3. Both A and B

  4. Hypodermis

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Correct Option: A
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.

The wall of cork cells are thickened by the deposition of________________

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

  1. Cutin

  2. Suberin

  3. Lignin

  4. Pectin

Show answer
Correct Option: B
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.

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.

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

  1. (i) and (ii)

  2. (ii) and (iii)

  3. (i) and (iv)

  4. (i), (ii) and (iv)

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Correct Option: A
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.

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

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

  1. Cutin

  2. Suberin

  3. Elastin

  4. Chondrin

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Correct Option: A
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.