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Structural Organisation in Animals Test - 56

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Structural Organisation in Animals Test - 56
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  • Question 1
    1 / -0
    Blood of Cockroach has no role in respiration as it does not have
    Solution
    The blood in a cockroach is colourless as there are no respiratory pigments such as haemoglobin. This type of colourless blood without any respiratory pigment is called haemolymph. As the respiratory pigment is absent in blood of cockroach, it does not have any role in respiration.
    So, the correct answer is 'Haemoglobin'
  • Question 2
    1 / -0
    Which is correctly matched in Pheretima
    Solution
    Mature sperm and egg cells and nutritive fluid are deposited in
    cocoons produced by the gland cells of clitellum. Fertilization and development occur within the cocoons which are deposited in the soil. 
    The ova (eggs) are fertilized by the sperm cells within the cocoon which then slips off the worm and is deposited in or on the soil. The cocoon holds the worm embryos.
    So the correct answer is 'Clitellum secretes cocoon'.
  • Question 3
    1 / -0
    A tactile organ of Cockroach is
    Solution
    Cockroach antennae have been extensively used for studying the multifunctional sensory appendage that generates the olfactory, gustatory, tactile, thermal, and humidity senses. The tactile sense is thought to play a key role in perceiving physical objects. Because most cockroach species are nocturnal, the tactile sense of the antenna would be essential to determine the position, shape, and texture of surrounding objects in the dark.
    So the correct answer is 'Antennae'.
  • Question 4
    1 / -0
    Special feature of Pheretima is
    Solution
    In Pheretima pair of a short and conical intestinal caecae project from the intestine on the 26th segment. The characteristic feature of the intestine after 26th segment except the last 23rd-25th segments is the presence of an internal median fold of dorsal wall called typhlosole. This increases the effective area of absorption in the intestine.
    So the correct answer is 'Typhlosole increases the effective absorptive area for digested food'.
  • Question 5
    1 / -0
    Which is absent in coelomic fluid of earthworm?
    Solution
    The blood of Pheretima is red coloured due to the presence of respiratory pigment haemoglobin in it. The haemoglobin is not contained in the corpuscles like the vertebrates but it is found dissolved in the plasma. The plasma also contains many corpuscles which are colourless and nucleated.
    Haemoglobin is absent in coelomic fluid of earthworm.
    So the correct answer is 'Haemoglobin'.
  • Question 6
    1 / -0
    In Cockroach, gizzard contains
    Solution
    In Cockroach, gizzard is a round and thickly walled knot. Its lining has six large cuticular thickenings or teeth and six thin plates and pads covered with long bristles. Gizzard grinds the food and also acts as a strainer permitting only a few food particles into the midgut.
    So, the correct answer is 'Six teeth',
  • Question 7
    1 / -0
    In Cockroach, digestive juice is secreted by 
    Solution
    In cockroach at the junction of gizzard and mesenteron, there is 6-7 small finger-like projection known as hepatic caeca. These are hanging in the hemocoel ending blindly but opening in the midgut. Hepatic caeca produce digestive enzymes. With the help of these digestive enzymes, the digestion of food takes place in the mesenteron. After the digestion, the nutrient such as carbohydrates, fats, and proteins are absorbed by the midgut, especially in the more anterior parts including the caeca. 
    So the correct answer is 'Hepatic caeca'.
  • Question 8
    1 / -0
    Identify the set of collecting and distributing blood vessels in Pheretima
    Solution
     In Pheretima dorsal blood vessel It is the collecting blood vessel in this region. It is present along the mid dorsal line above the gut. It collects blood in each segment through dorso-intestinal vessels from the intestine and from the sub-neural blood vessel through the commissural blood vessels. The openings of dorso-intestinal and commissural blood vessels into the dorsal blood vessel are valvular.
    Each commissural vessel gives off a septo-intestinal branch to the intestine. Thus the commissural blood vessels act as collecting and distributing vessels.
    So the correct answer is 'Dorsal blood vessel and commissural blood vessels'.
  • Question 9
    1 / -0
    In earthworm, efficiency of food absorption is due to structure
    Solution
    In earthworm, the characteristic feature of the intestine after 26th segment except the last 23rd-25th segments is the presence of an internal median fold of dorsal wall called typhlosole. This increases the effective area of absorption in the intestine. 
    So, the correct answer is 'Typhlosole'.
  • Question 10
    1 / -0
    Identify the wrong statement regarding earthworm.
    Solution

    [A] The first segment of the earthworm, the peristomium, contains the mouth. There is a small tongue-like lobe which is just above the mouth termed as prostomium. It is the right statement regarding earthworm.

    [B] Earthworms use the prostomium to see their environment, as earthworms have no eyes, ears, nose or hands It is the wrong statement regarding earthworm.

    [C] Clitellum is the ring-shaped, non- segmented glandular tissue or region in the body of annelids such as earthworm and leeches. It is the right statement regarding earthworm. It is the right statement regarding earthworm

    [D] The Prostomium is actually a sensory device. It is the right statement regarding earthworm

    [E] The body consists of S-shaped setae, which help in locomotion in the earthworm. It is the right statement regarding earthworm.

    Thus, the correct answer is option B.

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