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Structural Organisation in Animals Test - 47

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Structural Organisation in Animals Test - 47
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  • Question 1
    1 / -0
    Oenocytes secrete
    Solution
    This is a thin nonchitinous layer present on the entire body surface of three parts, they are outer lipoprotein cement layer, middle wax layer and an inner layer of polyphenols. It lacks chitin. Oenocytes are secreted in Epicuticle.
    So the correct answer is 'Epicuticle'.
  • Question 2
    1 / -0
    Trichogen cells of epidermis of Cockroach produce
    Solution
    A layer of columnar epithelial cells called epidermis is present below the cuticle. The cells of the epidermis are functionally and structurally different types. Trichogen cells form movable bristles. 
    So the correct answer is 'Bristles'.
  • Question 3
    1 / -0
    Blood of Cockroach contains corpuscles known as
    Solution
    The cockroach has an open vascular system consisting of sinuses with blood. The blood of cockroach is without haemoglobin and is colourless. This type of blood is known as haemolymph. It has two types of corpuscles. Proleucocytes which are small with large nucleus and phagocytes which engulf microbes. A reducing sugar called trachea loses is also present along with organic salts dissolved in this plasma.
    So, the correct answer is 'All the above'.
  • Question 4
    1 / -0
    Digestion in Periplaneta begins in
    Solution
    Organic food is taken by mouthparts. It enters in the preoral cavity.
    From here it enters in the mouth and mixes with saliva and then enters in the crop.
    From crop, it enters in gizzard where it is crushed & filtered. In midgut, food is digested by enzymes. Absorption of digested food occur. In hindgut water and salts are absorbed & then faecal waste is discarded through the anus.
    So the correct answer is 'Preoral cavity'.
  • Question 5
    1 / -0
    Number of spiracles in Cockroach is
    Solution
    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 the parts. The opening of the spiracles is regulated by the sphincters. Exchange of gases takes place at the tracheoles by diffusion.
    So the correct answer is '10 pairs'.
  • Question 6
    1 / -0
    The largest spiracles are
    Solution
    The thoracic spiracles lead into several horizontal tracheae, whereas each abdominal spiracle leads into atria. The stigmata 2 pairs are present in the thoracic region and 8 pairs in the abdominal region. Stigmata are present between mesothorax to the 8th abdominal segment. The largest spiracles are seen in Mesothorax.
    So the correct answer is 'Mesothoracic'.
  • Question 7
    1 / -0
    Cockroach is
    Solution
    Excretion is performed by malpighian tubules. Each tubule is lined by glandular and ciliated cells. They absorb nitrogenous waste products and convert them into uric acid which is excreted out through the hindgut. Therefore this insect is called as uricotelic.
    So the correct answer is 'Uricotelic'.
  • Question 8
    1 / -0
    True coelom of Cockroach occurs
    Solution
    The cockroach is a coelomate animal but its coelom is greatly reduced in the adults. The original coelom is represented by the cavities of the reproductive organs. The space between the body wall and gut represents the haemocoel which is filled with blood. Hence true coelom of Cockroach occurs around the gonads.
    SO the correct answer is 'Around gonads'.
  • Question 9
    1 / -0
    Number of alary muscles in Cockroach is
    Solution
    In cockroach, there is a dorsal diaphragm below the heart. It is perforated by many small apertures through which haemocoel communicates with pericardium. There are also 12 pairs of alary muscles attached to diaphragm. These are triangular and their pointed ends are inserted into terga.
    So, the correct answer is 'Twelve pairs'.
  • Question 10
    1 / -0
    Body cavity of Cockroach is formed by
    Solution
    • Coelom is the principal body cavity in most animals located between the intestinal canal and the body wall. In developed animals, it is lined with mesothelium. 
    • The cockroach is a coelomate animal but its coelom is greatly reduced in the adults. The coelom is represented by the cavities of the reproductive organs. The body cavity is filled with hemocoel which is filled with blood. The hemocoel is related to the blood vascular system.
    • Hence Body cavity of Cockroach is formed by Coelom.
    • So, the correct answer is'Coelom'.
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