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Tissues Test - 94

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Tissues Test - 94
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Weekly Quiz Competition
  • Question 1
    1 / -0
    In a leaf, vascular bundles are found in:
    Solution
    Vascular bundles are a collection of tube-like tissues that flow through plants, transporting various substances to various parts of the plant. The vascular tissue present in vascular bundles exists in two forms: xylem and phloem. In leaves, these are generally present in the veins where the xylem channelizes the water and phloem conducts the prepared food.
    Thus, the correct answer is option A.
  • Question 2
    1 / -0
    The wax like substance present in the cell wall of onion skin is
    Solution
    Onion epidermal skin forms a protective layer against harmful viruses and fungi which can infect underlying soft, sensitive tissues. One of the protective mechanism in onion is the presence of suberin in onion cell wall. The cell wall of onion becomes thick and waterproof due to deposition of suberin. Therefore, option D is correct. 
  • Question 3
    1 / -0
    When subminimal stimulus is given, then
    Solution
    Muscles are excitatory tissue. Muscle contraction is initiated by a signal sent by the central nervous system (CNS) via a motor neuron. A motor neuron along with the muscle fibres connected to it constitute a motor unit. The junction between a motor neuron and the sarcolemma of the muscle fibre is called the neuromuscular junction or motor-end plate. A neural signal reaching this junction releases a neurotransmitter (Acetylcholine) which generates an action potential in the sarcolemma. This spreads through the muscle fibre and causes the release of calcium ions into the sarcoplasm. The muscle fibres contract based on all or none philosophy and the nervous stimulus should be above a critical threshold to cause muscular contraction. In case the stimulus is sub-minimal, muscles will not contract. This is called All or None law.
    Hence the correct option is C.
  • Question 4
    1 / -0
    Mineral which helps in formation of RBCs is 
    Solution
    A mineral which helps in the formation of RBCs is iron (Fe) because iron makes up the active part of haemoglobin which directly binds to and carries oxygen. If we don’t eat enough iron, we cannot produce enough haemoglobin to make functional red blood cells. Hence the correct option is A.
  • Question 5
    1 / -0
    Pigmented dendritic cells occur in
    Solution
    Epidermis is the outer part of skin, which is keratinised and composed of stratified squamous epithelium layers. In the structure of epidermis on the basis of shape of cells and cytoplasm, there are five stratum -
    (1) Stratum Malpighii
    (2) Stratum spinosum
    (3) Stratum granulosum
    (4) Stratum lucidum
    (5) Stratum corneum
    An innermost stratum of epidermis consisting of one layer of cells is called as stratum Malpighii. It is also called as stratum basale. Cells are cubical or columnar in shape. In this stratum two types of cells are present.
    (i) Melanocytes - They are called pigmented dendritic cell. These cells are formed by modification of cell which lies at the junction of epidermis and dermis. 
    (ii) Keratinocytes - They get their nutrition from underlying connective tissue of dermis and divide to form another stratum of the epidermis.
  • Question 6
    1 / -0
    Phosphagen in vertebrates is:
    Solution
    The phosphagens are energy storage compounds, also known as high-energy phosphate compounds. They are chiefly found in muscular tissue in animals. ATP molecules can provide energy for only a few seconds of strenuous muscular activity. Thus muscle cells have backup energy storage compound, creatine phosphate, that can be stockpiled. The energy stored in creatine phosphate is transferred to ATP as needed. But during vigorous exercise, the supply of creatine phosphate is quickly depleted. Muscle cells must replenish their supplies of these energy-rich compounds. Chemical energy is stored in muscle fibers as glycogen, a large polysaccharide formed from hundreds of glucose molecules. Glycogen can be degraded, yielding glucose, which is then degraded in cellular respiration. When sufficient oxygen is available, enough energy is captured from glucose to produce needed quantities of ATP and creatine phosphate.
    Hence the correct option is A.
  • Question 7
    1 / -0
    Which of the following muscles are striated and branched?
    Solution
    The cardiac muscles (heart muscles) are involuntary striated muscles that are found in the walls of the heart. The heart is a pumping organ that needs to work tirelessly. To ensure this pumping efficiently, the cardiac muscle cells are bundled together giving the muscle a branched appearance. These bundled cells thus allow quick transmission of electrical signals which aid in efficient contraction and relaxation of the cardiac muscles. This in turn helps in the efficient pumping of the heart.
    So, the correct answer is option C.
  • Question 8
    1 / -0
    A mature human erythrocyte has the typical characteristic of
    Solution
    Mature human erythrocytes are eukaryotic cells, which have lost their nucleus and organelles. Initially, the RBCs have nucleus but lose it with maturation. Prokaryotic cells include bacteria and archaea bacteria. Prokaryotes are exclusively unicellular with a naked DNA, while erythrocytes (RBCs) are part of a multicellular organism. All eukaryotic cell has a nucleus, but RBC doesn't. So, they have properties of neither prokaryotes nor eukaryotes.
  • Question 9
    1 / -0
    The above flow chart shows the three steps of glucose breakdown in different conditions. Which of the given steps is responsible for muscle cramps?

    Solution
    Lactate is formed from the breakdown of glucose during anaerobic respiration.
    The cells make ATP during this process, which provides energy for most of the chemical reactions in the body. Lactate formation doesn't use oxygen, hence the process is often called anaerobic metabolism. Lactate-related ATP production is very fast. This makes it ideal for satisfying energy needs anytime exercise intensity exceeds 50% of maximum capacity. However the accumulation of lactic acid leads to muscle fatigue and muscle cramps.
    Hence the correct option is B. 


  • Question 10
    1 / -0
    Which of following tissues do you expect to be the most important during droughts and why?
    Solution
    The epidermis is the outermost cellular layer which covers the whole plant structure, i.e. it covers roots, stem, leaves, flowers, and fruit. It is composed of a single layer of living cells. The outer walls, which are exposed to the atmosphere and usually thickened, are covered by a waxy, waterproof cuticle which is made up of cutin. The waxy cuticle prevents the loss of moisture from the leaves and stems. During drought, the plant hormone abscisic acid (ABA) triggers stomatal closure, thus reducing water loss.
    So, the correct answer is option C.
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