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Mix Test - 6

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Weekly Quiz Competition
  • Question 1
    1 / -0
    The development of egg without fertilisation is called
    Solution
    The development of egg without fertilisation is called parthenogenesis. It occurs commonly among lower plants and invertebrate animals (particularly rotifers, aphids, ants, wasps, and bees) and rarely among higher vertebrates. An egg produced parthenogenetically may be either haploid (i.e. with one set of dissimilar chromosomes) or diploid (i.e. with a paired set of chromosomes).
  • Question 2
    1 / -0
    Which of the following cells are enucleated in angiosperms and mammals, respectively?
    Solution
    Sieve tube members have no cell nucleus, ribosomes, or vacuoles. Thus, they depend on companion cells to provide proteins, ATP, and signalling molecules. In mammals, red blood cells also do not have any nucleus. It allows the red blood cell to contain more hemoglobin and, therefore, carry more oxygen molecules. It also allows the cell to have its distinctive bi-concave shape which aids diffusion.
  • Question 3
    1 / -0
    In kidneys, excess of substances like calcium oxalate and phosphates may result in
    Solution
    Kidney stones, or renal calculi, are solid masses made of crystals of various minerals. Most of the kidney stones are formed of calcium oxalates or phosphates.
  • Question 4
    1 / -0
    Match the following.

    1. Insulin (a) Regulates basal metabolism
    2. Glucagon (b) Inhibits secretion of insulin and glucagon
    3. Somatostatin (c) Stimulates milk ejection
    4. Thyroxine (d) Stimulates liver to covert glycogen into glucose
    5. Oxytocin (e) Stimulates deposition of extra glucose in liver
    Solution

    1. Insulin (e) Stimulates deposition of extra glucose in liver
    2. Glucagon (d) Stimulates liver to covert glycogen into glucose
    3. Somatostatin (b) Inhibits secretion of insulin and glucagon
    4. Thyroxine (a) Regulates basal metabolism
    5. Oxytocin (c) Stimulates milk ejection
  • Question 5
    1 / -0
    Hydrocephalus is a condition developed in the brain if the return of CSF is blocked. A similar situation developed in the eye is termed as
    Solution
    Glaucoma is an eye disease that is often associated with elevated intraocular pressure, in which damage to the eye (optic) nerve can lead to loss of vision and even blindness. Intraocular pressure increases when either too much fluid is produced in the eye or the drainage or outflow channels (trabecular meshwork) of the eye become blocked.
  • Question 6
    1 / -0
    Match the lists:

    List-I List-II
    Theories of Evolution/Origin of Life Scientists
    a. Catastrophism 1. Cuvier
    b. Inheritance of acquired characters 2. Lamarck
    c. Preformation 3. Bonnet
    d. Pangenesis 4. Darwin
    Solution
    The correct option is a - 1, b - 2, c - 3, d - 4.
    Catastrophism is a doctrine that explains the differences in fossil forms encountered in successive stratigraphic levels as being the product of repeated cataclysmic occurrences and repeated new creations. This doctrine generally is associated with the great French naturalist Baron Georges Cuvier.
    Lamarckism (or Lamarckian inheritance) is the hypothesis that an organism can pass on characteristics that it has acquired through use or disuse during its lifetime to its offspring. It is also known as the inheritance of acquired characteristics or soft inheritance.
    Bonnet and Spallanzani accepted the preformation theory. According to their version of this theory, the germs of all living things were created by God in the beginning and were encapsulated within the first female of each species.
    Pangenesis was Charles Darwin's hypothetical mechanism for heredity, in which he proposed that each part of the body continually emitted its own type of small organic particles called gemmules that aggregated in the gonads, contributing heritable information to the gametes.
  • Question 7
    1 / -0
    Which of the following valves guards the opening of aorta?
    Solution
    The aortic valve is a valve in the human heart between the left ventricle and the aorta. It is one of the two semilunar valves of the heart, the other being the pulmonary valve.
  • Question 8
    1 / -0
    Match the following:

    (i) Atlas and axis vertebral (a) Ball and socket joint
    (ii) Wrist and ankle (b) Hinge joint
    (iii) Elbow and knee (c) Pivot joint
    (iv) Shoulder and hip (d) Gliding joint
    Solution
    Correct Answer: (i) – (c), (ii) – (d), (iii) – (b), (iv) – (a)

    (i) Atlas and axis vertebral (c) Pivot joint
    (ii) Wrist and ankle (d) Gliding joint
    (iii) Elbow and knee (b) Hinge joint
    (iv) Shoulder and hip (a) Ball and socket joint
  • Question 9
    1 / -0
    Which type of immunoglobulin is present in human colostrum/milk?
    Solution
    The primary immunoglobulin in cow colostrum and milk is IgG, whereas the primary immunoglobulin in human milk is IgA. Much of this is produced by plasma cells in the mammary tissue. Colostrum contains antibodies to protect the newborn against various harmful bacteria and viruses.
  • Question 10
    1 / -0
    If the blood groups of parents are AB and O, the possible blood group(s) of children is/are
    Solution
    In ABO blood group, both A and B alleles are dominant over O. As a result, individuals who have an AO genotype will have an A phenotype and an individual with BO genotype will have B phenotype.
  • Question 11
    1 / -0
    The type of cartilage that is present in ear pinna is known as
    Solution
    Elastic cartilage is present in ear pinna.
    Hyaline cartilage is present in trachea, larynx and bronchi.
    Fibrous cartilage is present in intervertebral discs and pubic symphysis.
    Calcified cartilage is mostly found in aging cartilage.
  • Question 12
    1 / -0
    In which of the following diseases is the liver affected?
    Solution
    Hepatitis is the swelling and inflammation of the liver, most commonly caused by a viral infection. It may lead to liver damage, liver failure or even liver cancer.
  • Question 13
    1 / -0
    In flowers, which of the following conditions will increase chances of self-pollination?
    Solution
    If stamens are just above the stigma of pistil in a flower it increases chances of self pollination.
  • Question 14
    1 / -0
    Where is anthocyanin present in the cell?
    Solution
    Anthocyanin pigment is present in the vacuoles of the plant cells. Inside the vacuole, anthocyanins can be found uniformly distributed or as part of sub-vacuolar pigment bodies, the Anthocyanic Vacuolar Inclusions (AVIs).
  • Question 15
    1 / -0
    Meiosis in pteridophytes takes place at the time of
    Solution
    As with all plants, in pteridophytes, meiosis is sporic, meaning that cells of the sporophyte undergo meiosis and generate spores that then develop into the gametophyte via mitosis.
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