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Weekly Quiz Competition
  • Question 1
    1 / -0
    The treatment of snakebite by antivenin is an example of
    Solution
    Artificially acquired passive immunity is a short-term immunisation by the injection of antibodies, such as gamma globulin, that is not produced by the recipient's cells. When an antivenin is given, it is a form of passive immunity, which is a short-term immunisation given by injection.
  • Question 2
    1 / -0
    Monocot leaves have parallel venation and do not have a distinct midrib. Which of the following monocots is an exception to this rule?
    Solution
    Strelitzia reginae is called the bird of paradise flower.
  • Question 3
    1 / -0
    The channel running through the midbrain, connecting 3rd and 4th ventricles in humans, is known as
    Solution
    Aqueduct of Sylvius is a canal between the 3rd and 4th ventricles in the brain within the system of four communicating cavities that are continuous with the central canal of the spinal cord. The ventricles are filled with cerebrospinal fluid, which is carried by the aqueduct of Sylvius.
  • Question 4
    1 / -0
    Which of the following is a matching set of phylum and its three examples?
    Solution
    Mollusca includes those animals which have soft bodies, usually furnished with a shell. The body is often divided into a head, with eyes or tentacles, a ones. muscular foot and a visceral mass housing the organs. Loligo (squid or sea arrow), Teredo (shipworm)and Octopus are some of their examples.
    In option (a) Spongilla and Euplectella belong to porifera, but Pennatula (the sea pen or sea feather) belongs to coelenterata.
    In option (b) Physalia and Aurelia belong to cnidaria, but Bonellia belongs to phylum annelida.
    In option (c) Planaria and Schistosoma belong to platyhelminthes, but Enterobius (Pinworm) belongs to aschelminthes.
  • Question 5
    1 / -0
    Which of the following statements is true about a cartilage?
    Solution
    Characteristic features of cartilage are as follows:
    • The matrix of cartilage is made up of a flexible material called chondroitin.
    • The chondrocytes of cartilage are oval with no processes.
    • The lacunae of a cartilage lack canaliculli.
    • Cartilage is a non-vascular tissue with homogeneous matrix.
  • Question 6
    1 / -0
    The correct sequence of events of embryogenesis in humans is
    Solution
    Fertilization is the fusion of gametes to produce a new organism. The fertilised egg cell is known as the zygote. Cell division, with no significant growth, producing a cluster of cells that is the same size as the original zygote, is called cleavage. At least four initial cell divisions occur, resulting in a dense ball of at least sixteen cells called the morula. The different cells derived from cleavage, up to the blastula stage, are called blastomeres. During gastrulation, cells migrate to the interior of the blastula, subsequently forming two (in diploblastic animals) or three (triploblastic) germ layers. The embryo during this process is called a gastrula. This is the correct sequence of events after fertilisation.
  • Question 7
    1 / -0
    Which of the following cells wrap around axons within the central nervous system?
    Solution
    Oligodendrocytes wrap axons with myelin sheath within the central nervous system (brain and spinal cord).
    Schwann Cells and Oligodendrocytes perform essentially the same function (myelination of axons). The major difference between them is their location. Schwann cells myelinate axons in the peripheral nervous system, while Oligodendrocytes myelinate axons in the central nervous system.
  • Question 8
    1 / -0
    Which of the following statements is true about guttation in plants?
    Solution
    Hydathodes are specialised openings on leaves to facilitate guttation and it involves exudation of water along with some solutes as evident on examination of the fluid deposited.
  • Question 9
    1 / -0
    What is the correct sequence of ecological complexities starting from the smallest to the largest unit?
    Solution
    The correct sequence of ecological complexities starting from the smallest to the largest unit is: Individual, Population, Community, Ecosystem, Biome, Biosphere.

  • Question 10
    1 / -0
    Which of the following types of root modifications is found in radish?
    Solution
    Fusiform root modification is seen in radish. In this modification, the primary root is swollen in the middle while both the ends gradually taper forming a spindle-shaped structure.
  • Question 11
    1 / -0
    Algae Volvox is considered a colonial form and not a multicellular organism because
    Solution
    The difference between a multicellular organism and a colonial organism is that individual organisms form a colony. A biofilm can, if separated, survive on its own, while cells from a multicellular organism (e.g., liver cells) cannot. This fact holds true for Volvox as well.
    Each Volvox colony is made up of about 1,000 to 3,000 photosynthetic algae that get grouped together to form a hollow sphere. The sphere has a distinct front and back end. The cells have eyespots, which are more developed in the cells near the front. This enables the colony to swim towards light. All individual photosynthetic algae can survive on their own. Hence, Volvox is a colonial form and not multicellular.
  • Question 12
    1 / -0
    Raju was suffering from severe stomach pain. The doctor diagnosed that he was suffering from peptic ulcer and treated him with antibiotics. He was relieved of the pain. What could be the reason for peptic ulcer?
    Solution
    Bacteria Helicobacter pylori is responsible for peptic ulcer.
  • Question 13
    1 / -0
    Find the mismatched pair.
    Solution
    Ethylene is a fruit ripening hormone. It acts at trace levels throughout the life of the plant by stimulating or regulating the ripening of fruit, the opening of flowers, and the abscission (or shedding) of leaves.
  • Question 14
    1 / -0
    Which of the following is not a symptom of Cushing's syndrome?
    Solution
    Hypoglycaemia is a symptom of hyposecretion of adrenal cortex. Cushing's syndrome is caused by hypersecretion of adrenal cortex and shows symptoms of obesity, hyperglycaemia, osteoporosis, weakness, salt and water retention, etc.
  • Question 15
    1 / -0
    During which of the following periods of mesozoic era did the toothed birds become extinct?
    Solution
    During Cretaceous period of mesozoic era, toothed birds became extinct.The modern toothless birds evolved from their toothed ancestors in the Cretaceous period.
    In the Cretaceous period, early birds became more like the birds of today, with some groups losing their ancestral tails and teeth.
    By the end of Cretaceous period, bird groups such as Palaeognathae (ostriches and other flightless birds), Anseriformes (waterfowl), Galliformes (landfowl) and Neoaves (all other modern bird types) had appeared. They were to be the only birds to make it through the Cretaceous – Paleogene Extinction Event.
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