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Structural Organisation in Animals Test - 53

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Structural Organisation in Animals Test - 53
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  • Question 1
    1 / -0
    Chloragogen cells functionally resemble
    Solution
    The chloragogen cells are also called as 'y-cells'. These cells in annelids are functionally similar to liver of vertebrates. These cells undertake many functions. They store glycogen and also neutralize toxins. They also take part in deamination of amino acids and synthesise urea. These cells which are yellow in colour and aid in excretion are functionally similar to flame cells of  freshwater invertebrates, whose chief function is also excretion.
    So, the correct answer is 'Flame cells'.
  • Question 2
    1 / -0
    Which one does not occur in Earthworm
    Solution
    In Pheretima there are three types of nephridia,
    1. Septal nephridia: These are found situated on the inter-seg­mental septum between 15th and 16th segments to the posterior side of the body.
    2. Integumentary nephridia: n each segment of the body from 7th to the last segment, numerous nephridia are found attached inside the lining of the body wall. These are called integumentary nephridia 
    3. Pharyngeal nephridia: These 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.
    So the correct answer is 'Macronephridia'.
  • Question 3
    1 / -0
    Open vascular system is absent in
    Solution
    Pheretima exhibits a closed vascular system, consisting of blood vessels, capillaries, and heart. Due to the closed circulatory system, blood is confined to the heart an blood vessels. Contractions keep blood circulating in one direction. Smaller blood vessels supply the gut, nerve cord, and the body wall.
    Hence earthworm has closed blood vascular system.
    So the correct answer is 'Earthworm'.
  • Question 4
    1 / -0
    The gland whose secretion facilitates attachment of two earthworms during copulation is located in segment
    Solution
    Secretions of accessory glands facilitate attachment of two earthworms during copulation. The accessory glands are two pairs. They are situated one each in 17 th and 19 th segment on the ventral body wall at the lateral sides of the nerve cord.
    So, the correct answer is '19'.
  • Question 5
    1 / -0
    Type of feeding in Earthworm is
    Solution
    Earthworm is omnivorous and nocturnal. It is commonly found living in soil, feeding on live and dead organic matter. These scavenge the earth's surface and decompose the dead and decaying organisms. This area also used in the production of compost which acts as organic manure.
    So, the correct answer is 'Detritus feeding'.
  • Question 6
    1 / -0
    In Earthworm, dorsal wall of intestine from 26th segment to 95th segment forms a median internal fold called
    Solution
    In earthworm, the characteristic feature of intestine after 26th segment except the last 23-25th segments is the presence of internal medial fold of dorsal wall called 'Typhlosole'. Typhlosole increases the effective area of absorption in the intestine.
    So, the correct answer is 'Typhlosole'.
  • Question 7
    1 / -0
    Number of chambers in heart of Cockroach is
    Solution
    In Cockroach, the heart lies mid dorsally. It is pulsatile. It consists of 13 segmentally arranged funnel shaped chambers. Except the last one, each chamber has a pair of small lateral apertures or ostia that open into pericardial sinus.
    So, the correct answer is '13'.
  • Question 8
    1 / -0
    Blood glands of Pheretima take part in 
    Solution
    Blood glands are present on the 4th,5th and 6th segments. They produce blood cells and haemoglobin which is dissolved in blood plasma. Blood cells are phagocytic in nature. The blood vascular system of Pheretima is of closed type. It consists of the blood vessels, hearts, loops, capillaries, and the blood glands. Hence blood glands help in the formation of phagocytes.
    So the correct answer is 'Formation of phagocytes'.
  • Question 9
    1 / -0
    Brown colour of earthworm is due to
    Solution
    Earthworm is a glistening deep brown in colour. The dorsal surface is darker than the ventral surface and carries a dark colour median line due to the dorsal blood vessel which is seen through the integument. The brown colour of the worm is due to the pigment porphyrin present in the body wall and it protects the body against bright and UV rays of the sunlight.
    So the correct answer is 'Porphyrin'.
  • Question 10
    1 / -0
    Ommatidia serve the purpose of photoperception in
    Solution
    The photoreceptors in cockroach are of two types. They are the compound eyes or ommatidium and ocelli. These help in photoreception in cockroaches.
    So, the correct answer is 'Cockroach'.
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