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Structural Organisation in Animals Test - 89

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Structural Organisation in Animals Test - 89
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  • Question 1
    1 / -0
    Which pair of spiracles are borne dorsolaterally over the tergum instead of pleura
    Solution
    In cockroach, the first two pairs of spiracles are present in the thoracic segments, one pair in the mesothorax and one pair in the metathorax. The remaining eight pairs are present in the first eight abdominal segments. Spiracles are located in the pleura of the segments.
    So the correct answer is 'First abdominal'.
  • Question 2
    1 / -0
    Oenocytes occur in
    Solution
    The oenocytes are the most probable source of the cuticular wax in the cockroach. In the epicuticle of the cockroach, there is a cement layer formed, by secretion from certain of the dermal glands at the time of moulting. The exoskeleton has hardened plates sclerites that are joined to each other by a thin and flexible articular membrane. The epidermis consists of oenocytes.
    So, the correct answer is 'Epidermis'.
  • Question 3
    1 / -0
    First pair of wings of Cockroach are
    Solution
    In cockroach, thorax consists of three parts: prothorax, mesothorax and metathorax. The first pair of wings arises from mesothorax and the second pair from metathorax. The mesothoracic forewings called tegmina are opaque, dark and leathery. 
    So, the correct answer is 'Tegmina attached to mesothorax'.
  • Question 4
    1 / -0
    Number of diaphragms present in the haemocoel of Periplanata is
    Solution
    In cockroach, the haemocoel extends from anterior end of the body to the posterior end. The haemocoel, in fact, lacks the epithelium of a true coelom and is divided into three bigger sinuses by two horizontal septa. The septa are muscular membranous structures; one dorsal diaphragm and the other ventral diaphragm. Hence there are two diaphragms present in the haemocoel.
    So the correct answer is 'Two'.
  • Question 5
    1 / -0
    Anus in Cockroach occurs on
    Solution
    The abdomen is made up of 10 segments. The 7th, 8th and 9th sterna form a genital pouch in females. In males, the genital pouch is present at the hind end of the abdomen. The male cockroach has thread-like anal styles, which are absent in the female cockroach. The 10th segment,  in both male and female cockroach has a filamentous structure called the anal cerci.
    So, the correct answer is 'Ventral surface of 10th tergum'.
  • Question 6
    1 / -0
    Number of longitudinal tracheal trunks in Cockroach is
    Solution
    The thoracic spiracles lead into several horizontal trachea, where as each abdominal spiracle leads into atria. From each abdonimal spiracle 3 tracheal tubes arise.
    All these tracheal tubes of one side open into three separate longitudinal tracheal trunks.
    They are lateral, dorsal and ventral longitudinal trunks. The three pairs of longitudinal tracheal trunks of both the sides are interconnected by many tracheae.
    So, the correct answer is'Three pairs'.

  • Question 7
    1 / -0
    Testes occur in Cockroach in abdominal segments
    Solution
    Cockroaches are dioecious and both sexes have well developed reproductive organs. Male reproductive system consists of a pair of testes lying one on each lateral side in 4th - 6th abdominal segments. From each testis arises a thin vas deferens, which opens into ejaculatory duct through seminal vesicle.
    So, the correct answer is '4-6'.

  • Question 8
    1 / -0
    In Cockroach nerve cord ganglia are
    Solution
    In cockroach, the sub-oesophageal ganglion arises a double nerve cord which travels through the thorax and abdomen below the alimentary canal on the ventral side up to the posterior end of the body. The nerve-cord has three large ganglia in the thorax, one each for pro-, meso-and metathoracic segments, therefore, they are called prothoracic, mesothoracic and metathoracic ganglia.
    The nerve cord has six ganglia in the abdomen which lie in the 1st, 2nd, 3rd, 4th, 5th, and 7th segments. In Cockroach nerve cord ganglia are three pairs of thoracic and six pairs of abdominal.
    So the correct answer is 'Three pairs thoracic and six pairs abdominal'.
  • Question 9
    1 / -0
    Chitnous rings supporting tracheae are called
    Solution
    The wall of tracheae made up of 3 layers. Outer basement membrane, middle one cell thick epithelium and internally lined by intima which is a chitinous layer.  Intima produces spiral thickenings or chitinous rings called Taenidia. Taenidia present in trachea prevent the collapse of the trachea.
    So, the correct answer is 'Taenidia'.
  • Question 10
    1 / -0
    Vision of Cockroach is
    Solution
     Each eye is composed of a large number of independent visual units called ommatidia which are connected to the optic nerve. These small images are combined in the brain to form a complete image of the object that is made of small dots or mosaic of dots and hence it is called mosaic vision. Vision of cockroach is Mosaic.
    So, the correct answer is 'Mosaic'
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