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Tissues Test - 47

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Tissues Test - 47
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Number of WBCs per mm$$^3$$ of human blood is _______.
    Solution
    White blood cells (WBCs), also called leukocytes, are an important part of the immune system. These cells help to fight against infections by attacking bacteria, viruses, and germs that invade the body. White blood cells originate in the bone marrow but circulate throughout the bloodstream. The number of WBCs per mm$$^3$$ of human blood is approximately 8000. 
    Hence, option A is correct.
  • Question 2
    1 / -0
    Which protein is present in largest amount in human body?
    Solution
    Collagen protein is present in the largest amount in the human body. Collagen is the main structural protein of the various connective tissues in animals. As the main component of connective tissue, it is the most abundant protein in mammals, making up from 25% to 35% of the whole-body protein content. Collagen, in the form of elongated fibrils, is mostly found in fibrous tissues, such as tendons, ligaments and skin. It is also abundant in corneas, cartilage, bones, blood vessels, the gut, intervertebral discs and the dentin in teeth.
    Hence the correct option is A.
  • Question 3
    1 / -0
    In a rabbit, the RBCs are formed from
    Solution
    The RBCs in rabbit are formed from the myeliod lineage of hemocytoblasts or stem cells more specifically the myeloblast found in the stroma of the bone marrow.  Hence the correct option is A.
  • Question 4
    1 / -0
    Which is not a component of areolar tissue?
    Solution
    Areolar tissue is loose, irregularly arranged connective tissue, that consists of collagenous and elastic fibres and also a protein and connective tissue cells. It is strong enough to bind different tissue types together, yet soft enough to provide flexibility and cushioning. Macrophage, plasma cell and adipose cell all are areolar tissues .
    However, Schwann cell is a component of nerve cell.
    So, the correct answer is 'Schwann cell'
  • Question 5
    1 / -0
    Which of the following is a loose connective tissue?
    Solution
    • Areolar tissue is a common type of connective tissue, also referred to as loose connective tissue. 
    • It is strong enough to bind different tissue types together, yet soft enough to provide flexibility and cushioning.
    • It exhibits interlacing, loosely organised fibres, abundant blood vessels, and significant empty space.
    • Its fibres run in random directions and are mostly collagenous, but elastic and reticular fibres are also present. 
    • Areolar tissue is highly variable in appearance.

      So, the correct answer is option A.
  • Question 6
    1 / -0
    A tissue with spiral thickening in the cell wall capable of absorbing water from air is known as 
    Solution
    The hygroscopic epidermis, present in the epiphytes are called velamen tissues. It is made up of spongy dead cells which help in the absorption of water from the atmosphere. It also checks excessive loss of water from the cortex. The wall of velamen has spiral or reticulate secondary thickening of lignin, cellulose and pectin.
    So, the correct answer is option B.
  • Question 7
    1 / -0
    Collagen and elastin are formed by
    Solution
    A fibroblast is a type of cell that synthesises the extracellular matrix and collagen - the structural framework or stroma for animal tissues and plays a critical role in wound healing. Fibroblasts are the most common cells of connective tissue in animals. These cells synthesises both collagen and elastin.
    So, the correct answer is 'Fibroblasts'
  • Question 8
    1 / -0
    Bulliform cells are found in
    Solution
    Bulliform cells are the special cells known for its peculiar bubble like shape. The turgor pressure created due to the water present in the cells is lost during stress like transpiration or infection which allows the leaf to roll up. Once adequate water is available, these cells enlarge and the leaves open again. Bulliform cells are found in the leaf of wheat (grasses) and not in seeds of sunflower, a pod of pea and tuber of potato. 
    Thus, option B is correct.
  • Question 9
    1 / -0
    Waxy coating on epidermis of young stem is called as:
    Solution
    • A cuticle is the waxy layer present on the epidermis of a young stem, it generally prevents water loss by transpiration.
    • Phellem (the cork) consists of cells that are dead at maturity and their primary walls become covered from the inside by the secondary wall which consists of parallel suberin lamellae alternating with wax layers.
    • The periderm is the secondary protective (dermal) tissue that replaces the epidermis during growth in thickness of stems and roots of gymnosperms and dicotyledons. 
    • Suberin is a waterproofing waxy substance found in higher plants.
    Thus, the correct answer is option D.
  • Question 10
    1 / -0
    Which would do maximum harm to a tree?
    Solution
    • The loss of half of branches does not harm the tree much, as remaining half of the branches bear green leaves that can carry out photosynthesis and transpiration. 
    • Shedding of all leaves is carried out by the plant itself but it does not harm the tree. Soon after shedding, the new leaves begin to form on the tree. 
    • The bark is the outermost layer of the stem of woody plants. All the tissues outside the vascular cambium are called as bark. It protects the tree from wear and tear, bacterial infection and water loss. If all of the bark of the tree is removed then water loss will dry out the tree and tree will also become vulnerable to infections. 

    So, the correct option is D.
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