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Mix Test - 4

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Weekly Quiz Competition
  • Question 1
    1 / -0
    From which of the following is the hallucinogenic drug 'LSD' obtained?
    Solution
    LSD is lysergic acid diethylamide. It is also known as psychedelic drug. It is obtained from the fungus Claviceps purpurea. It grows on the ears of rye, cereal and forage plants. It can cause ergotism in human and other mammals if they consume cereal or fodder infected with this fungi.
  • Question 2
    1 / -0
    Consider the following statements:

    Placenta present in mammals acts as an endocrine tissue and produces
    (A) human chorionic gonadotropin
    (B) estrogen
    (C) progesterone
    (D) testosterone

    Which of the above statements are correct?
    Solution
    Placenta is an endocrine gland that is only present during pregnancy. It produces hormones including human chorionic gonadotropin (hCG), progesterone, estrogen, and human placental lactogen (hPL).
    Testosterone is a steroid hormone from the androgen group. In humans and other mammals, testosterone is secreted primarily by the testicles of males and, to a lesser extent, the ovaries of females.
  • Question 3
    1 / -0
    Match the following:

    (a) Small differences between individuals (i) Alleles
    (b) Sudden change in one or more genes (ii) Traits
    (c) Alternative forms of characters (iii) Mutation
    (d) Alternative forms of a gene occupying the same position on chromosomes (iv) Variation
    Solution
    (a) Small differences between individuals (iv) Variation
    (b) Sudden change in one or more genes (iii) Mutation
    (c) Alternative forms of characters (ii) Traits
    (d) Alternative forms of a gene occupying the same position on chromosomes (i) Alleles

    Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).
  • Question 4
    1 / -0
    The person with Turner's syndrome has
    Solution
    Turner syndrome (TS), also known as 45,X or 45,X0, is a condition in which a female is partly or completely missing an X chromosome. Signs and symptoms vary among those affected. Often, a short and webbed neck, low-set ears, low hairline at the back of the neck, short stature, and swollen hands and feet are seen at birth.
  • Question 5
    1 / -0
    Osteomalacia, a disease of the bones in adults, is
    Solution
    Osteomalacia, a disease of the bones in adults, is due to dietary deficiency of calcium and vitamin D. Measures to prevent and treat osteomalacia usually revolve around intake of vitamin D and calcium supplements.
  • Question 6
    1 / -0
    Which of the following hormones stimulates the conversion of amino acids into proteins during the well-fed state?
    Solution
    In fed or post-absorptive state, insulin promotes the uptake of branched-chain amino acids (valine, leucine, and isoleucine) by the muscles. Insulin has a general stimulating effect on protein synthesis, which favours a building up of muscle protein. In addition, it inhibits the intracellular degradation of proteins.
  • Question 7
    1 / -0
    The second maturation division of the mammalian ovum occurs
    Solution
    Oogenesis starts with division of oogonia (gamete mother cells) giving rise to primary oocyte which enters into prophase-I of the meiotic division and gets temporarily arrested at this stage. This primary oocyte gets surrounded by primary, secondary and tertiary follicles, respectively. The tertiary follicle grows in size and completes its first meiotic division to give rise to haploid secondary oocyte. This secondary oocyte forms a new membrane called zona pellucida surrounding it. During fertilisation, the sperm enters the cytoplasm of the ovum through the zona pellucida and the plasma membrane. This induces the completion of the meiotic division (2nd division) of the secondary oocyte. The second meiotic division is also unequal and results in the formation of a second polar body and a haploid ovum (ootid).
  • Question 8
    1 / -0
    Which of the following cells is/are absent in areolar tissues?
    Solution
    Areolar connective tissue holds organs in place and attaches epithelial tissue to other underlying tissues. It also serves as a reservoir of water and salts for surrounding tissues. Almost all cells obtain their nutrients from and release their wastes into areolar connective tissue. Areolar tissues have fibroblast, macrophages, mast cells, plasma cells, etc. Neuroglial cells are absent in areolar tissues.
  • Question 9
    1 / -0
    Hypothyroidism in adulthood leads to
    Solution
    Hypothyroidism in adulthood leads to myxoedema. Myxoedema refers to deposition of mucopolysaccharides in the dermis, which results in swelling of the affected area.
  • Question 10
    1 / -0
    Drooping of the leaves of Mimosa pudica is an example of
    Solution
    The closing of leaves of Mimosa pudica is an example of seismonastic movement.
    The folding leaf movements in Mimosa pudica result from a loss of turgor from extensor cells of pulvini, specialised motor organs located at the bases of the leaflets and petioles. Because of the loss of turgor pressure, the leaves droop.
  • Question 11
    1 / -0
    Acrosome reaction in sperms is triggered by
    Solution
    The fertilisin of an egg interacts with the anti-fertilisin of sperm of the same species. This attraction between fertilisin and anti-fertilisin makes the sperms stick to the egg surface. The process of acquiring the capacity to fertilise the egg by the sperm is called capacitation. In this process, the membrane surrounding the acrosome of the sperm breaks and releases its contents, i.e. the sperm lysin. It is the chemical substance present in the sperm's acrosome.
  • Question 12
    1 / -0
    Which of the following events is affected by the presence and distribution of yolk in the egg?
    Solution
    The pattern of cleavage of the egg is affected by the presence of yolk in the egg. In the presence of a large amount of yolk in the fertilised egg cell, the cell can undergo partial or meroblastic cleavage. Two major types of meroblastic cleavage are discoidal and superficial.
  • Question 13
    1 / -0
    The internal absorption of cyanocobalamin is because of Castle's intrinsic factor. This factor is produced by
    Solution
    Parietal cells are the epithelial cells that secrete hydrochloric acid (HCl) and intrinsic factor. These cells are located in the gastric glands found in the lining of the fundus and in the body of the stomach.
  • Question 14
    1 / -0
    Which of the following is the correct difference between monocots and dicots?
    Solution
    Differences between monocots and dicots are as follows:
    • Leaf venation in dicots is reticulate and is parallel in monocots.
    • Floral parts of dicots are multiples of 5 and multiples of 3 in monocots.
    • Embryo has 2 cotyledons in dicots and 1 in monocots.
    • Vascular bundles are arranged in rings in dicots and scattered in monocots.
  • Question 15
    1 / -0
    Limbs and girdles are generally not found in snakes, but vestiges of the pelvic girdle and hind limbs persist in
    Solution
    The fossil record of snakes extends to the Lower Cretaceous period and indicates that undulatory locomotion was well developedby that time. Direct evidence on the sequence of intermediate stages of limb reduction is not available, though some primitive snakes do retain vestiges of the pelvic girdle and limb elements, for example: Python.
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