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Structural Organisation in Animals Test - 49

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Structural Organisation in Animals Test - 49
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  • Question 1
    1 / -0
    Cockroach has
    Solution
    The sense organs present on the head in cockroach are a pair each of compound eyes, antennae and ocellar spots.
    So, the correct answer is 'Two types of eyes'.
  • Question 2
    1 / -0
    Binucleate cells are
    Solution
    The excretory organ of cockroach is the malpighian tubules. The nephrocyte in a cockroach is the lateral wall of their heart. This wall helps excretion and helps store waste. It is found at the junction of the midgut and hindgut and is about 150 in number. They are fine, yellow-coloured and branched threads present in bundles. They lie freely in the hemolymph. these cells are binucleated structures.
    So the correct answer is 'Nephrocytes'.
  • Question 3
    1 / -0
    The main function of clitellum is
    Solution
    The clitellum is part of the reproductive system. The clitellum is a thick, saddle-like ring found in the epidermis (skin) of the worm, usually with a light-coloured pigment. To form a cocoon for its eggs, the clitellum secretes a viscous fluid. The main function of clitellum is cocoon formation. In earthworms, the clitellum can only be seen when the worm is sexually mature.
    So, the correct answer is 'Cocoon formation'
  • Question 4
    1 / -0
    Male and female cockroaches can be distinguished externally by
    Solution
    In males, genital pouch lies at the hind end of abdomen bounded by 8th and 9th terga and ventrally by 9th sternum. It contains dorsal anus ventral male genital pore and gonapophysis. Males bear a pair of short, thread-like anal styles which are absent in females.
    So the correct answer is 'Anal styles in male'.
  • Question 5
    1 / -0
    Adult Frog is
    Solution
    The development of a frog includes a larval stage called tadpole. The larval tadpole is a herbivore whereas the adult frog is a carnivore. The tadpole feeds on small aquatic plants and algae. The adult frog feeds on insects and pests.
    So, the correct answer is option A. 
  • Question 6
    1 / -0
    Photoreceptors of Earthworm occur on
    Solution
    Earthworms do not have eyes they do have specialized photosensitive cells called "light cells of Hess". These photoreceptor cells have a central intracellular cavity (phaosome) filled with microvilli. As well as the microvilli, there are several sensory cilia in the phaosome which are structurally independent of the microvilli. The photoreceptors are distributed in most parts of the epidermis but are more concentrated on the back and sides of the worm. Hence, photoreceptors are present on the dorsal surface.
    So the correct answer is 'Dorsal surface'.
  • Question 7
    1 / -0
    Number of ganglia present in nerve cord of Cockroach is
    Solution
    The total number of ganglia present in the nerve cord of cockroach is nine. Three thoracic ganglia are present in the region of thorax and six are abdominal.
    So, the correct answer is '9'.
  • Question 8
    1 / -0
    Clitellum of Pheretima is thick girdle that is
    Solution
    In a mature worm, segments 14-16 are covered by a prominent dark band of glandular tissue called clitellum. Thus the body is divisible into three prominent regions preclitellar, clitellar and post clitellar segments.
    So the correct answer is 'Glandular around 14-16 segments'.

  • Question 9
    1 / -0
    Setae occur in earthworm in all segments except
    Solution
    In Earthworm, each body segment, except the first, last and clitellum, there are rows of S-shaped setae, embedded in the epidermal pits in the middle of each segment. Setae can be extended or retracted. Their principal role is in locomotion. Hence setae occur in Earthworm in all segments except clitellar region, anal segment, and peristomium.
    So the correct answer is 'All of the above'.
  • Question 10
    1 / -0
    Teeth of Frog are
    Solution
    The teeth are homodont, i.e. similar in shape. They are curved backward and attached to the bones (acrodont) instead of being set in sockets. Each tooth is conical in shape and consists of two parts-the base and the crown. The base is attached to the jaw bone and is made of a bone-like substance.
    So, the correct answer is 'Acrodont and isodont'.
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