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Diversity in Living Organisms Test - 86

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Diversity in Living Organisms Test - 86
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  • Question 1
    1 / -0
    Ocellated feathers of male peacock are
    Solution
    • Rectrices in birds are the feathers that they use during flight. The tail aids the flight of birds by providing a larger surface area. They are often attached symmetrically to the last tailbone of the birds, the pygostyle. Their number varies from bird to bird. 
    • The length of the rectrices determines the shape of the tail. 
    • The rectrices of peacocks are concealed under powerfully developed upper tail coverts that have ocellated bluish-green spots on them. Feathers that have ocellated spots are ocellated feathers.

    So, the correct answer is option C.
  • Question 2
    1 / -0
    Chordotonal organs are connected with perception of 
    Solution
    The perception of sound for some insects is important for mating behavior. The ability to hear in Insecta and Crustacea is given by chordotonal organs mechanoreceptors, which respond to mechanical deformation. These receptors allow detection of sound via the vibrations of particles when sound is transmitted through a medium such as air or water.
    So the correct answer is 'Sound'.
  • Question 3
    1 / -0
    Read the follwoing statements and choose the correct option :
    (i) Aves are homeothermous.
    (ii) Pinnae are present in mammals.
    (iii) Operculum is present in chondrivhthyes.
    (iv) Skin of amphibians is dry and horny.
    (v) Open type of circulation is found in cyclostomes.
    Solution
    Aves are homeothermic (can maintain body temperature). 
    Pinnae are uniquely present in some mammals. It is not present in all mammals.
    Operculum is only found in bony fishes and not in Cartilaginous Fishes or chondrichthyes.
    Skin of amphibians is moist and smooth.
    Open type of circulation is found in Cyclostomes.
    So the correct answer is 'ii, iii and iv are wrong'.
  • Question 4
    1 / -0
    Vestigial pelvic girdle and bone remnants of hind limbs are the characteristics of
    Solution
    Whales are yet another classic example of animals that lost their hind legs. Recently found fossils are evidence that they had hind limbs back in geological time. Remnants of hind limbs and vestigial pelvic girdle can still be found in Whales. 
    So the correct option is 'Whale'.
  • Question 5
    1 / -0
    In some animal groups, the body is found divided into compartments with serial repetition of at least some organs. What is this characteristic feature called?
    Solution
    The serial repetition  of organs when body is divided into compartments is called metamerism because metamerism is the phenomenon of having a linear series of body segments fundamentally similar in structure. It is mainly seen in phylum annelida.
    So, the correct answer is 'Metamerism'.
  • Question 6
    1 / -0
    Which one is a burrowing marsupial ?
    Solution
    Notoryctus (Marsupial mole) builds burrows that are holes or tunnels which are excavated into the ground for habitation, refuge, or formed as a result of locomotion. 
    Thylacinus, Myrmecobius, Phascolaractos are marsupials but do not show such activities and majorly live on land or trees.
    So the correct answer is 'Notoryctus'. 
  • Question 7
    1 / -0
    Study the statements about chordates and identify correct ones :
    (a) Columella auris present in the middle year of amphibians is modified hyomandibula of fishes.
    (b) Reptiles lay cleidoic eggs.
    (c) Sphenodon is connecting link between amphibians and reptiles.
    (d) Panthera tigris is an extinct animal of India.
    Solution
    • Columella auris is the modified hyomandibula commonly found in fishes.
    • Cleidoic egg is also known as amniotic egg and is a characteristic of reptiles and birds.
    • Sphenodon is a connecting link between amphibians and reptiles.
    • Panthera Tigris is an endangered species in India. It hasn't gone extinct.

    So the correct answer is '(a), (b) and (c).' 
  • Question 8
    1 / -0
    In Rhinoceros, horn is formed from
    Solution
    The horn is made up of stratum corneum which is the outer layer of skin. This layer is made cells which have high amounts of keratin. 
    Adipose tissues are present beneath the skin and store fats.
    Stratum germinativum is the innermost layer of the epidermal cells.
    Stratum lucidum is beneath the stratum corneum and is made up of thin dead cells. The layer is transparent.
    So the correct answer is 'Stratum corneum'. 
  • Question 9
    1 / -0
    Select the correct match.
    Solution
    Rana is a genus of frogs.
    Annelida is the phylum of Earthworms.
    Whale belongs to class Mammalia.
    Bats belong to the Class Mammalia.
    So, the correct answer is option D.
  • Question 10
    1 / -0
    Choose the correct answers from the alternatives given.
    Bilateral segmented bodies and hardened exoskeletons occur among the:
    Solution
    One character inherited by all arthropods is bilateral symmetry. Many animals have a body form that is symmetrical, meaning that it could be divided into matching halves by drawing a line down the center. The exoskeleton of an arthropod is their tough, hard outer shell. Though chitin is a tough substance, many arthropods add calcium carbonate to their exoskeleton to make it even stronger. This is especially true for crustaceans, such as crabs and lobsters.
    So, the correct option is, 'arthropods'.
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