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Tissues Test - 48

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Tissues Test - 48
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  • Question 1
    1 / -0
    Passage cells occur in
    Solution
    Passage cells are endodermal in origin. These are found in cells of older roots which have retained thin walls and casparian strips to allow some symplastic flow to the inside. They do not get suberized or thickened.
    Experimental evidence suggests that passage cells function to allow transfer of solutes such as calcium and magnesium into the stele, in order to eventually reach the transpiration system. For the most part, however, old roots seal themselves off at the endodermis and only serve as a passageway for water and minerals taken up by younger roots downstream. So, passage cells occur in endodermis and not in pericycle, cortex or epidermis.
    Thus, the correct answer is option C.
  • Question 2
    1 / -0
    The cotton fibres are 
    Solution
    • Cotton is a seed hair fibre belonging to  the genus Gossypium and the 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.
    • The fibre is almost pure cellulose. Under natural conditions, the cotton bolls will tend to increase the dispersion of the seeds
    • 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.
  • Question 3
    1 / -0
    Laticiferous glands are found in which of the following plant part?
    Solution
    • 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.

  • Question 4
    1 / -0
    Periblem gives rise to 
    Solution
    The apical meristematic tissue is a continuously dividing tissue which mainly helps to form different specialized cells. Periblem is the histogen in plants that gives rise to the cortex. It is the multilayered zone that lies beneath the dermatogen. The periblem cells divide in 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.
  • Question 5
    1 / -0
    Endodermis is a part of
    Solution
    • 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.  During secondary growth, rupturing of epidermal cell and outer cortex by secondary tissues induces formation of new protective layer, periderm which in turn divides to form cork cambium /phellogen. 
    • Vascular tissues system consists of stele, which is the central region having vascular bundle, pericycle, pith and medullary rays. 
    • The tissues present outside the stele forms extrastelar tissues system. Stele is surrounded by endodermis and cortex, these two together make extra stelar system. 
    • Intrastelar tissues system refers to the tissues present in a stele i.e., vascular bundle, pericycle, pith and medullary rays.
    Hence the correct option is B.
  • Question 6
    1 / -0
    Scaly bark occurs in
    Solution
    The 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 result in the formation of 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.
  • Question 7
    1 / -0
    Peyer's patches produce:
    Solution
    • Peyer's patches are located in the ileum of small intestine. They are masses of lymphatic tissue. 
    • Their function is to produce lymphocytes which prevent the growth of bacterial populations inside the body. 
    • Hence the correct option is B.
  • Question 8
    1 / -0
    Protosteles are found in
    Solution
    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 - haplostele, actinostele, plectostele and mixed protostele. 
    Thus, option C is correct.
  • Question 9
    1 / -0
    The term haematocrit means
    Solution
    The hematocrit, also known as packed cell volume (PCV) or erythrocyte volume fraction (EVF), is the volume percentage of red blood cells in blood. It is normally 45% for men and 40% for women. It is considered an integral part of a person's complete blood count results, along with hemoglobin concentration, white blood cell count, and platelet count. Hence the correct option is A.
  • Question 10
    1 / -0
    Ligaments connects
    Solution
    A ligament is the fibrous connective tissue that connects bones to other bones. Ligaments are similar to tendons and fasciae as they are all made of connective tissue. Tendons connect muscle to bone and fasciae connect muscles to other muscles. So, the correct answer is option A.
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