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Diversity in Living Organisms Test - 83

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Diversity in Living Organisms Test - 83
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  • Question 1
    1 / -0
    What is true of Neaceratodus?
    (a) It is a crosspterygian fish.
    (b) It is found in parnas river basin.
    (c) It does not exhibit aestivation.
    (d) It is a ureotelic animal.
    Solution
    C. a and c
    Reason: The genus Neaceratodus includes lungfish, a connecting link between amphibians and pisces. It belongs to the class dipnoi and subclass crossopterygii. It is generally found in swamps and still water. It doesn't perform aestivation (summer sleep) and is an ammoniotelic individual. 
    So correct option is C.
  • Question 2
    1 / -0
    Thread worm or pinworm is
    Solution
    Thread worm or pinworm is a parasitic worm commonly found in the intestine of humans, belonging to phylum Nematoda. The scientific name of these worms is Enterobius vermicularis
    So, the correct answer is 'Enterobius vermicularis'
  • Question 3
    1 / -0
    Lungs without air sacs occur in
    Solution
    A) Air sacs are found as tiny sacs as extensions of the lungs in birds to increase respiratory efficiency by providing a large surface area for gas exchange. Sparrows have air sacs.
    B) Peacocks have air sacs even though they do not fly to great heights.
    C) Bird lungs are aided by air sacs that help to dissipate heat and reduce the density of their bodies for flying. Penguin is a flightless bird and so, it lacks air sacs.
    D) Falcons have air sacs to help in respiration and flight.
    So the correct answer is 'Penguin'.
  • Question 4
    1 / -0
    Bird's milk is
    Solution
    A) Birds produce milk in their crops which consists of a suspension of protein-rich and fat-rich cells that proliferate and detach from the lining of the crop. Lactation in birds is also controlled by prolactin, which is the same hormone that causes lactation in mammals.
    B) Both males and females produce crop milk.
    C) It is used to nourish young birds.
    D) Crop milk is a secretion from the lining of the crop of parent birds (both male and female) that is regurgitated to young birds.
    So the correct answer is 'All of the above'
  • Question 5
    1 / -0
    Syrinx is present in the region of
    Solution
    A) Birds have a syrinx at the base of the trachea.
    B) The trachea of birds bifurcates into two primary bronchi at the syrinx. Hence, the syrinx is present at the base of the trachea.
    C) Birds have a syrinx at the base of the trachea. The sound is produced by vibrations of the walls of the syrinx, caused by air flowing through the syrinx.
    D) Birds do not have a pleural cavity as the lungs do not expand, so membranes are not necessary. One primary bronchus from the trachea enters each lung, narrowing as it travels through, and communicates with the abdominal air sac. Bronchi are absent.
    So the correct answer is 'End of trachea'.
  • Question 6
    1 / -0
    Flight feathers are
    Solution
    A) Contour feathers are small feathers that give the body shape.
    B) Quill feathers are large feathers found in the wings and tail that help in flight.
    C) Coverts are small feathers found in the wings and tail that fill up any gaps between quill feathers.
    D) Filoplumes occur under contour feathers.
    So the correct answer is 'Quills'.
  • Question 7
    1 / -0
    Gizzard of birds is a part of
    Solution
    A) The crop is a part of the oesophagus.
    B) The gizzard is a modified stomach used for crushing and grinding food like seeds and nuts.
    C) Birds have a small intestine that is similar to the small intestine of mammals. It is receives crushed food from the gizzard for digestion.
    D) The large intestine in birds is very short and consists of a short colon. It ends in the cloaca.
    So the correct answer is 'Stomach'.
  • Question 8
    1 / -0
    Which one is a living fossil?
    Solution

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

    • Sphenodon is a genus of reptiles that are endemic to New Zealand, also called tuatara.
    • They have few peculiar characteristics as they can hear but they do not have an external ear.
    • They have a third eye also known as photoreceptive.
    • It is considered a ‘living fossil’ as it is the only surviving member of an ancient group of reptiles that flourished during the time of the dinosaur. 

  • Question 9
    1 / -0
    New World Monkey lacks
    Solution
    New world monkeys has:
    1. Tail is prehensile.
    2. Lack cheek pouches.
    3. Lack ischial callosities.
    4. Have a flat nose with a broad internassal septum.
    So, the correct answer is 'Both B and C'.
  • Question 10
    1 / -0
    Rhampotheca is
    Solution
    Rhampotheca is a horny skin structure of keratinized epidermis covering the upper and lower jaws of the beak.
    So, the correct answer is 'Horny sheath covering the beak'.
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