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Diversity in Living Organisms Test - 75

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Diversity in Living Organisms Test - 75
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  • Question 1
    1 / -0
    Bat is a mammal because _________.
    Solution
    • A mammal is a warm-blooded vertebrate animal of a class that is distinguished by the possession of hair or fur, females that secrete milk for the nourishment of the young ones and (typically) the birth of live young.
    • Bats are mammals because they give birth to live young, nurse their young ones, have hair and like all mammals, the females of any species possess mammary glands that produce milk to feed their young offspring.
    So, the correct answer is option C.
  • Question 2
    1 / -0
    The animals of a certain phylum possess these characteristics: 
    1. Triploblastic
    2. Bilaterally symmetrical
    3. True coelom present
    4. Segmented body
    Identify the correct phylum.
    Solution
    Out of all the four options, animals of phylum Annelida show all the four mentioned characteristics. Annelids are triploblastic (have three germ layers) and bilaterally symmetrical (the body can be divided into two equal haves only through the midline). They possess a true coelom (fluid-filled body cavity) and their body is segmented (body is divided into segments). 
    Some examples of annelids are earthworm, leech, etc.
    So, the correct answer is option B.
  • Question 3
    1 / -0
    21/30 Respiratory organs in aquatic arthropods like cary fish,prawns and molluscus like Unio are
    Solution

    • A gill is a respiratory organ found in many aquatic organisms that extract dissolved oxygen from water and excretes carbon dioxide. 
    • The gills of some species, such as hermit crabs, have adapted to allow respiration on land provided they are kept moist. 
    • The microscopic structure of a gill presents a large surface area to the external environment. 
    • Hence,  Respiratory organs in aquatic arthropods like Cary fish, prawns and molluscs like Unio are Gills.
    • So, the correct answer is 'Gills'.
    "
  • Question 4
    1 / -0
    Which of the following is a mismatch?
    Solution
    Horses are odd-toed ungulates.
    Pheretima or earthworms do not have parapodia.
    Hydra is a Cnidarian as it has cnidocytes used for capturing prey as well as locomotion.
    shark is a cartilaginous fish as it does not have bones but soft cartilages.
    So the correct answer is 'Pheretima - Parapodia'.
  • Question 5
    1 / -0
    Parasitic adaptations of  flatworms is:
    Solution
    Suckers help these worms cling to their hosts. Parasitic flatworms have hooks on their mouths that allow them to securely attach to their hosts,
    however, they eat through their mouth and lack a digestive system.
    So, the correct option is  'A'.
  • Question 6
    1 / -0
    Muscular pharynx is a characteristic of ______ phylum.
    Solution
    • Muscular pharynx of Aschelminthes and Annelids is used to ingest food. 
    • In Aschelminthes, it is used to capture prey as it contains pincer-like jaws. Example: Pinworm
    • In Annelids it is used to suck food. Example Earthworm. 
    So the correct option is both Aschelminthes and Annelida. 
  • Question 7
    1 / -0
    If the skin of Pheretima dries, it will die because of:
    Solution
    Asphyxia is defined as the condition in which either the body does not get enough oxygen or has too much carbon dioxide, as a result, the lack of oxygen causes death of the cell.
    So, the correct answer is 'Asphyxia'.
  • Question 8
    1 / -0
    Face of humans is
    Solution
    Prognathous is the type of human face in which lower or the upper jaw projects outwards abnormally. 
    So the correct option is 'Prognathous'.
  • Question 9
    1 / -0
    Thecodont teeth are present in?
    a. Sphenodon
    b. Crocodiles
    c. Mammals
    d. Scoliodon.
    Solution
    Teeth on the basis of types of attachment are divided into 3 types-Acrodont, pluerdont and thecodont.
    Tecodont is a type of teeth present in the animals where the root of the teeth is firmly attached in the socket of the jawbone.This is the strongest attachment of teeth and is found in mammals.

    So, the correct option is 'c only'
  • Question 10
    1 / -0
    Which of the following hormones regular growth and metamorphosis in insect?
    Solution
    Metamorphosis is the series of changes in the life of an insect where it changes from the larva to the adult form. Ecdysis or molting is the periodic shedding of the old exoskeleton. The form of the developing insect between two molts is called instar.
    There are various hormones that regulate metamorphosis. Some of them are-
    1. Prothoracicotropic (PTTH) or brain hormone that signals the prothoracic cells to secrete molting hormone.
    2. Ecdyson- This is secreted by the prothoracic gland. The hormone stimu­lates growth and initiates the process of molting and shedding the old cuticle of the larva and the new cuticle is formed beneath the old cuticle.
    3. juvenile hormone (JH)- The juvenile hormone keeps the larval cells active and also controls the qualitative changes in the body during metamorphosis.

    So, the correct option is 'Ecdyson'
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