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Structural Organisation in Animals Test - 91

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Structural Organisation in Animals Test - 91
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Weekly Quiz Competition
  • Question 1
    1 / -0
    In Cockroach moulting is induced by secretion of
    Solution
    When an immature insect has grown sufficiently to require a larger exoskeleton, sensory input from the body activates certain neurosecretory cells in the brain. These neurons respond by secreting brain hormone which triggers the corpora cardiaca to release their store of prothoracicotropic hormone (PTTH) into the circulatory system. This sudden "pulse" of PTTH stimulates the prothoracic glands to secrete molting hormone.
    So the correct answer is 'Prothoracic gland'.
  • Question 2
    1 / -0
    Ten pairs of spiracles with trachea are present in
    Solution
    In cockroach, the respiratory system consists of a network of the trachea, that open through 10 pairs of small holes called spiracles present on the lateral side of the body. Thin branching tubes carry oxygen from the air to all parts. The openings of the spiracles are regulated by the sphincters. Exchange of gases takes place at the tracheoles by diffusion.
    So the correct answer is 'Cockroach'.
  • Question 3
    1 / -0
    Typhlosole of Earthworm is a device for
    Solution
    A pair of short conical intestinal caecae project in the intestine on the 26th segment. The characteristic feature of the intestine after 26th segment except for the last 23rd -25th segments is the presence of an internal median fold of dorsal wall called typhosole. This increases the effective area of absorption in the intestine. The alimentary canal opens to the exterior by a small rounded aperture  alimentary canal known as anus.
    So the correct answer is 'Increasing absorptive area'.
  • Question 4
    1 / -0
    Cockroach blood does not contain respiratory pigment. It means
    Solution
    Male cockroaches have colorless blood and female cockroaches have blood in orange color. This is due to the absence of haemoglobin in their blood. Cockroaches use a series of tubes known as trachea for respiration process. Oxygen reaches through the tissues with the help of tracheoles. 
    So the correct answer is 'Oxygen reaches tissues through tracheoles'.
  • Question 5
    1 / -0
    Endocrine glands of insects which secrete juvenile hormone are
    Solution
    In insects, Juvenile hormone refers to a group of hormones, which ensure the growth of the larva, while preventing metamorphosis. 
    Juvenile hormones are secreted by a pair of endocrine glands behind the brain called the corpora allata. Juvenile hormone is also important for the production of eggs in female insects.
    So the correct answer is 'Corpora allata'.
  • Question 6
    1 / -0
    Cockroach of genus Blatta is called
    Solution
    The oriental cockroach known as Blatta orientalis, also known as the waterbug or black beetle, is a large species of cockroach, adult males being 18–29 mm and adult females being 20–27 mm. It is dark brown or black in color and has a glossy body. Oriental cockroaches tend to travel somewhat more slowly than other species. 
    So the correct answer is 'Oriental Cockroach'.
  • Question 7
    1 / -0
    Pharyngeal nephridia of earthworm Pheretima occur in segments
    Solution
    Pharyngeal nephridia lie in three paired tufts, one on either side of the anterior region of the alimentary canal in the segments 4th, 5th, and 6th. The tufts of pharyngeal nephridia also contain blood glands.
    Each pharyngeal nephridium is about the size of a septal nephridium but it is of the closed type having no funnel or nephrostome. It has a short straight lobe and a spirally twisted loop, its lumen has ciliated canals.
    So the correct answer is '4th,5th and 6th segments'.
  • Question 8
    1 / -0
    Which one will excrete silicates consumed by earthworm along with food?
    Solution
    Chloragogen cells store glycogen and neutralize toxins, are yellowish in color due to the presence of yellow granules called chloragosomes and are present in the coelomic fluid of some annelids. It is similar to the liver of a vertebrate. They take part in the deamination of amino acids and synthesis of urea. Silicates taken in along with food are deposited in the chloragogen cells.
    So the correct answer is 'chloragogen cells'.
  • Question 9
    1 / -0
    Which structure of Pheretima plays the role of liver?
    Solution
    Chloragogen cells, also called as y cells are cells in annelids that function similarly to the liver in vertebrates. The cells store glycogen and neutralize toxins, are yellowish in colour due to the presence of yellow granules called chloragosomes and are present in coelomic fluid of some annelids.
    So the correct answer is 'Chloragogen cells'.
  • Question 10
    1 / -0
    Pericardial space in Cockroach is regularly altered by muscles
    Solution
    Dorsal diaphragm consists of connective tissue with associated muscles which are called alary muscles. In cockroaches, they resemble wings projecting laterally from the dorsal vessel of each abdominal segment. It is the Alary muscles that help in blood circulation. The alary muscles are associated with all the thirteen chambers of cockroach's heart on either side of it. The alternate contraction and relaxation of these muscles help to pump the blood.
    So the correct answer is 'Alary'.
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