Tag: permanent tissues and their types
Questions Related to permanent tissues and their types
Which would do maximum harm to a tree?
-
Loss of half of its leaves
-
Loss of half of its branches
-
Loss of all of its leaves
-
Loss of all its bark
The cotton fibres are
-
Fibres taken out from stem
-
Epidermal hairs of seed
-
Epidermal hairs of fruits
-
Fibres taken out from roots
Cotton, seed hair fibre of a variety of plants of the genus Gossypium, belonging to the hibiscus, or mallow family (Malvaceae) and native to most subtropical parts of the world. Cotton is a soft, fluffy staple fibre that grows in a boll or protective capsule, around the seeds of cotton plants of the genus Gossypium in the family of Malvaceae.
The fibre is almost pure cellulose. Under natural conditions, the cotton bolls will tend to increase the dispersion of the seeds. The epidermis cells is a single-layered group of cells that covers plants leaves, flowers, roots and stems. It forms a boundary between the plant and the external environment. Cotton fibres are collected from epidermal layer of seeds. So, cotton fibres are epidermal hairs of seed and not epidermal hairs of fruits, fibres taken out from roots or fibres taken out from the stem.
Thus, the correct answer is option B.
Endodermis is a part of
-
Vascular tissue system
-
Extrastelar tissue system
-
Epidermal tissue system
-
Intrastelar tissue system
The epidermal tissues system forms the outer protective covering of primary plant body in form of epidermis and of secondary plant organs in form of periderm.
Periblem gives rise to
-
Epidermis
-
Cortex
-
Pericycle
-
Pith
The apical meristematic tissue is continuously dividing tissue which mainly helps forms different specialized cells. Periblem is the histogen in plants that gives rise to the cortex. It does not give rise to the epidermis, pericycle, and the pith. It is the multilayered zone that lies beneath the dermatogen. The periblem cells divide into anticlinal and periclinal planes and give rise to cortex and endodermis. Pleurome gives rise to pericycle, vascular tissues, pith and medullary rays. Dermatogen gives rise to an epidermal layer of plant organs.
Thus, the correct answer is option B.
Scaly bark occurs in
-
Eucalyptus
-
Betula
-
Psidium
-
None of the above
The bark is composed of periderm and stem's secondary phloem, the cork cambium, phelloderm and cork cells together make up the periderm. Formation of new periderm layer renders the previous layer dead due to stoppage of water and nutrient supply and differentiates the bark into two regions, namely outer and inner bark. The cork, secondary cortex and phloem present just outside the innermost phellogen constitute outer bark while rest of the tissues present in the outer bark make inner bark. Formation of subsequent periderm layers as overlapping scales gives scaly bark as is present in Psidium. When the bark is peeled off as large sheets, it is termed as intermediate bark as is found in Eucalyptus and Betula.
Thus, the correct answer is option C.
Multiple epidermis occurs in
-
Gossypium
-
Cucurbita
-
Nerium
-
All of the above
The epidermis cells are the cells which form the outer layer and plays an important role in protection. It helps to prevent the water loss by transpiration. Nerium, is a xerophyte which has layers of epidermal tissue to curtail the rate of transpiration. It is a type of xerophytic adaptation.
Thus, the correct answer is option D.
Protosteles are found in
-
Bryophyta
-
Gymnosperms
-
Pteridophyta
-
Angiosperms
Prostele is a primitive and simple type of stele. It consists of a solid mass of xylem surrounded by phloem, pericycle, and endodermis. It is permanently present in adult stems of many living pteridophytes, e.g. Lygodium, Lycopodium, Hymemophyllus, and Selaginella. It is present in vascular plants. Protostele is of four types as haplostele, actinostele, plectostele and mixed protostele. Thus, option C is correct.
In which of the following plant part, laticiferous glands are found?
-
Cortex
-
Epidermis
-
Endodermis
-
Vascular bundle
Laticiferous vessels are the specialized thin walled parenchymatous cells that secrete latex and are found in the cortex. They lack pits and are composed of cellulose and hemicelluloses and serve to secrete latex. Epidermis is the outermost covering of the primary plant body and is mostly represented by a single layer of compactly arranged, barrel-shaped parenchyma cells.
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. Vascular bundle consists of xylem, phloem and cambium (in dicot only) which are derived from procambium and serve in translocation of food and sap.
Thus, the correct answer is option A.
The function of hypodermis is
-
Protection
-
Hardness
-
Support
-
Storage
Hypodermis lies below the epidermis. These cells are sometimes modified to give additional structural support or to store food materials or water. Since its cell walls are heavily suberized and impermeable to water its apparent function is to keep the water and nutrients from leaking out through the cortex. The hypodermis is especially well developed in plants of arid regions and in those with shallow root systems. It also deters the entrance of soil microorganisms. So, the function of hypodermis is support and not storage, hardness or protection. Thus, option C is correct.
Innermost layer of cortex is
-
Endodermis
-
Epidermis
-
Exodermis
-
Hypodermis
Epidermis is the outermost covering of the primary plant body and is mostly represented by a single layer of compactly arranged, barrel-shaped parenchyma cells that delimit cotex on outer side.