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Structural Organisation in Animals Test - 17

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Structural Organisation in Animals Test - 17
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  • Question 1
    1 / -0
    How many segments are present in an earthworm?
    Solution
    • An earthworm belongs to the phylum Annelida. 
    • Organisms in this phylum display bilateral symmetry, have a rudimentary head region (cephalization), and contain segmented bodies.
    • The body of an earthworm is made up of approximately 100-120 segments. 
    • Each segment has muscles and bristles, known as setae, that help in the movement.

    Hence, option D is correct.
  • Question 2
    1 / -0
    How many heart does an earthworm possess?
    Solution
    • Earthworm does not have a true heart as it is an invertebrate, but they have five pairs of aortic arches that are referred to as the heart.
    • These arches are present in the anterior region of the body and they connect ventral and dorsal vessels and pump blood throughout the body. 

    Thus, the correct option is B.
  • Question 3
    1 / -0
    In earthworm, the dorsal wall of the intestine from the $$26^{th}$$ segment to $$95^{th}$$ segment forms a media internal fold known as 
    Solution
    In earthworm, the dorsal wall of the intestine from the 26$$^{th}$$ segment to 95$$^{th}$$segment forms a media internal fold called Typhlosole. It increases absorptive surface in intestine and aids in absorption.
    So, the correct answer is option B.
  • Question 4
    1 / -0
    In cockroach, larval and nymphal characters are maintained by
    Solution
    • Juvenile hormone (JH) prevents metamorphosis until a larva has attained an appropriate phase of development. 
    • It is produced by corpora allata in insects. 
    • It favors the development of juvenile characteristics. 
    • During larval life, this hormone predominates, and each moult yields another larger juvenile and keeps the larva in immature condition. 

    So, the correct answer is option D.
  • Question 5
    1 / -0
    Which of the following nephridia is not found in earthworm?
    Solution
    Nephridia are the organs which mainly helps in excretion and osmoregulation. The septal nephridia in earthworm are arranged in two rows of 40-50, attached on either side of the septa in each segment, behind the 15th segment. The septal nephridia are responsible for preventing loss of water. The integumentary nephridia are the smallest of the three types and are most numerous, 200-250 in each segment. The pharyngeal nephridia occur as paired tufts surrounding the alimentary canal in the 4th, 5th and 6th segments. 
    So, the correct answer is option B.
  • Question 6
    1 / -0
    Pharyngeal nephridia of Pheretima occur in which of the following segments?
    Solution
    The pharyngeal nephridia occur as paired tufts surrounding the alimentary canal in the 4$$^{th}$$, 5$$^{th}$$ and 6$$^{th}$$ segments. A large number of nephridia are grouped together to form each tuft. The terminal ducts of all the nephridia unite to form a common excretory duct. So, the correct answer is option B.
  • Question 7
    1 / -0
    Which of the following organism lacks open circulatory system?
    Solution
    Housefly, cockroach, and silverfish are all Arthropod animals. Arthropods have an open blood circulatory system where the blood is pumped into haemocoel which is a body cavity. The tissues are in direct contact with the blood. Earthworm is an Annelida animal. Annelids have closed circulatory system where the blood is circulated in closed blood vessels. So, the correct answer is option D.
  • Question 8
    1 / -0
    Locomotion occurs is earthworm with the help of
    Solution
    Annelids are characterized by the segmented body and each segment has a repetition of organs. They are bilaterally symmetrical and belongs to phylum Annelida. These animals possess longitudinal and circular muscles which help in locomotion. In addition, earthworm also possesses "S" shaped chitinous spicules (setae)which aid in locomotion. 
    So, the correct answer is option D.
  • Question 9
    1 / -0
    Pheretima and its close relatives derive nourishment from
    Solution
    Pheretima feeds on decaying matter in soil and makes soil porous by swallowing it and excreting soil as small pellets. This activity of earthworm aerates the soil and makes the organic matter decay faster. The intestine specifically helps in the digestion of complex substances into simple ones. Intestine secretes pepsin to digest proteins, amylase to digest polysaccharides, cellulase to digest cellulose, and lipase to digest fats. So, the correct answer is option B.
  • Question 10
    1 / -0
    In Pheretima, coelomic fluid contains
    Solution
    The coelomic compartments are filled with coelomic fluid, which is milky in colour and consists of plasma and four types of nucleated corpuscles, namely, phagocytes, nucleated cells, mucocytes and chloragogen cells. There is no haemoglobin. So, the correct answer is option D.
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