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Diversity in Living Organisms Test - 60

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Diversity in Living Organisms Test - 60
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  • Question 1
    1 / -0
    Eggs of egg laying mammals are
    Solution
    Eggs of egg laying mammals have a huge amount of yolk, much greater than the cytoplasm present in the cell (Macrolecithal). Based on the distribution of yolk, they are (Telolecithal) where yolk is unevenly distributed.
    Alecithal eggs have negligible amount of yolk.
    Mesolecithal eggs have their yolk concentrated in one region of the cell and the cytoplasm and nucleus use up most of the space.
    So the correct answers are 'Macrolecithal' and 'Teliolecithal'.
  • Question 2
    1 / -0
    Which statement is incorrect?
    Solution

    A. Correct option is- C
    B. Explanation for the correct option

    • Whales are not fish but mammals. They are the largest aquatic mammals.
    • All insects have three pairs of legs. It is a characteristic feature of all arthropods.
    • All mammals have mammary glands and hairs may be absent in some.
    • Flame cells are special excretory cells present in Platyhelminthes having kidney-like functions
  • Question 3
    1 / -0
    Which is not true?
    Solution
    Mammals have 4 chambered hearts and may have hair of fur.
    All molluscs have shells on their bodies as the exoskeleton.
    Intestinal roundworm, Ascaris, have three anterior lips with small teeth.
    Many snakes have fangs but external ears are absent in all. Three kinds of fang structures are seen in snakes and every snake may contain any one kind.
    So the correct answer is 'Mammals have 4 chambered hearts but no hair'.
  • Question 4
    1 / -0
    An egg laying mammal is
    Solution
    Tachyglossus is also known as short beak echidna and belongs to the class Monotremes. Monotremes are egg-laying mammals.
    Pangolin, Bat and Porcupine are all placental mammals.
    So the correct answer is 'Tachyglossus'. 
  • Question 5
    1 / -0
    Which of the following animal has mammary glands?
    Solution

    A. Correct option-D
     B. Explanation for the correct option

    • The characteristic feature of mammals is mammary glands.
    • These glands are involved in the production and secretion of milk that nourishes the young one.
    • Parrot belongs to Aves, Earthworm is Annelida and Crocodile belongs to Reptilia. Hence they do not bear mammary glands.
    • Rabbit belongs to class Mammalia and shows the presence of mammary glands. 

  • Question 6
    1 / -0
    In which set of the following does all the animals belong to Mammalia?
    Solution
    In set A, ostrich is not a mammal but an avian.
    In set B, penguin is not a mammal but an avian.
    In set C also, penguin is not a mammal but an avian.
    In set D, all belong to Mammalia.
    So the correct answer is option D.
  • Question 7
    1 / -0
    Two toed hoofed feet occur in 
    Solution
    An elephant has five toes which a buried inside the flesh of the toes.
    Horses and Donkeys have an extended digit which bears all the weight and so the hoof is made of only one digit.
    Sheep have a two-toed hoofed foot or it can be said that the hoof is split into two evenly sized toes. This is known as a split hoof.
    So the correct answer is 'Sheep'.
  • Question 8
    1 / -0
    Besides bats, echolocation also occurs in
    Solution
    Whales and Dolphins have echolocation system which involves the generation of ultrasonic sound which in turn produces echoes which are then reflected back by any obstacles in their path. This helps them in locomotion and catching their prey even with poor visibility. 
    Primates, Wild Cats and Beavers do not use echolocation for locomotion or predation. While primates and wild cats have good vision, beavers have an extremely good sense of hearing, smell and touch.
    So the correct answer is 'Whales and Dolphins'.
  • Question 9
    1 / -0
    Sweat glands and external ears are characters of group:
    Solution
    Only mammals have external ears and sweat glands. These are present mainly for thermoregulation and excretory purposes.
    Birds do not have external ears or sweat glands but have feathers for thermoregulation
    Reptiles have ear-like structures but that cannot be counted as external ears.
    Amphibians and Reptiles do not have sweat glands and external ears since they do have thermoregulatory mechanisms.
    So the correct answer is 'Mammals'.
  • Question 10
    1 / -0
    Very large animal with a single nostril is
    Solution
    Sharks have two nostrils but they're only used for smelling and not breathing.
    Pythons have two nostrils but they're only used for breathing and not smelling. Tortoise all have two nostrils used for breathing.
    Whales are large animals with only one nostril (left nostril). They are also known as blowholes and are used to spray mucus and carbon dioxide while the whale is breathing.
    So the correct answer is 'Whale'.
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