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Structural Organisation in Animals Test - 61

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Structural Organisation in Animals Test - 61
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  • Question 1
    1 / -0
    The striated appearance of a myofibril is due to distribution pattern of
    Solution
    Skeletal or voluntary muscle as shown in the diagram  have a striped appearance as a result of regular overlapping of thick (Myosin) and thin (actin) myofilaments.
    So, the correct option is 'Actin and myosin'.

  • Question 2
    1 / -0
    The cells lining the blood vessels belong to the category of ____________.
    Solution
    Correct Answer: B
    Explanation:
    • Squamous epithelium or pavement epithelium is a type of simple epithelial tissue.
    • It is formed of a single layer of closely fitted, flattened, polygonal cells that develop bulges in the region of their nuclei.
    • The adjacent cells are held together with help of various types of junctions, commonly tight junctions.
    • The cells of squamous epithelium appear as tiles on the floor due to their attachment to the basement membrane by hemidesmosomes.
    • It occurs in the lining of various components of the blood vascular system, pericardial cavity, abdominal cavity, alveoli of lungs, etc.
    Hence, the correct answer is Squamous epithelium.  
  • Question 3
    1 / -0
    Stratum corneum of Frog contains.
    Solution
    A. Living non-nucleated flattened cells
    EXPLANATION: The stratum corneum is the outermost layer of frog skin. It resists the movement of water between internal and external environments. The stratum corneum is a thick layer, polyhedral-shaped and have living non-nucleated cells named corneocytes.
  • Question 4
    1 / -0
    The excretory organ of cockroach and other insects are 
    Solution
    1. Nephridia are the excretory organs that are most commonly seen in earthworms.
    2. Gizzard is present in alimentary canal of some insects, which helps in crushing food particles.
    3. Flame cells are the excretory organs of platyhelminthes.
    4. Malpighian tubules constitute the excretory organs of cockroach and other insects.
    So, the correct option is 'Malphigian Tubules'.
  • Question 5
    1 / -0
    The juvenile hormone promoting the nymphal characteristics of insects, is produced by 
    Solution
    Juvenile hormone (neotenin) are secreted by a pair of endocrine glands behind the brain called the corpora allata. They serve two major functions; they regulate the development process in cockroach and the production of eggs in female ovaries.
    So, the correct option is 'Corpus allatum'.
  • Question 6
    1 / -0
    Cockroach is 
    Solution
    The malpighian tubules of cockroach are lined by glandular and ciliated cells. They absorb nitrogenous waste products and convert them into uric acid which is excreted through the hindgut. Hence, cockroach is a uricotelic animal.
    So, the correct option is 'Uricotelic'.
  • Question 7
    1 / -0
    Compound eyes are found in 
    Solution
    Compound eyes are found in cockroach, a few features of which are described below :
    • Compound eyes of cockroach are large, black and kidney-shaped.
    • It is situated dorsolaterally on the head.
    • Eye consists of about 2000 similar hexagonal units called ommatidium, each capable of forming an image.
    • The eyes are covered externally with a transparent cuticle called the cornea.
    So, the correct option is 'Cockroach'.
  • Question 8
    1 / -0
    Which of the following is correct about cockroach? 
    Solution
    • In cockroaches, mandibles are a pair of short, triangular, hard, unjointed, chitinized structures present on either side of the mouth.
    • The inner margins of mandibles have teeth-like structures that help to masticate food.
    • The gizzard is the next structure that is present after the crop. It helps in grinding the food particles due to the presence of six chitinous plates called teeth.
    • The Malpighian tubules perform the excretion in a cockroach. There are glandular and ciliated cells that are present lining each tubule, which absorb the nitrogenous waste products. These are found at the junction of the midgut and hindgut and is about 150 in number.
    • The blood of cockroaches does not have haemoglobin or any other respiratory pigment to carry oxygen.
    • Nitrogenous excretory product is uric acid.

    So, the correct answer is option D.
  • Question 9
    1 / -0
    Papillary muscles are found in mammalian _______.
    Solution
    The papillary muscles are the involuntary muscles which are present in the ventricles of the mammalian heart. They support the tricuspid valves and mitral valves. The contraction of the papillary muscles opens these valves and when the papillary muscles relax, the valves get closed. Chordae tendineae connects the papillary muscles to the valves.
    So, the correct answer is option B.

  • Question 10
    1 / -0
    Given below are four statements (a - d) each with two blanks, regarding morphology and physiology of cockroach. Select the option which correctly fills up the blanks in any two statements.
    (P) At the junction of  (i)  and midgut is present ring of 100-150 yellow coloured thin filamentous  (ii) 
    (Q)  (i)  is a sac like structure, used for storing food. It is followed by  (ii)  which helps in grinding food.
    (R) The respiratory system consists of a network of  (i) , that open through 10 pairs of small holes called  (ii)  on lateral side of the body.
    (S) In both sexes, the  (i)  segment bears a pair of jointed filamentous structures called  (ii) .
    Solution
    A. (P) (i) Foregut, (ii) Gastric caecae 
    (S) (i) Tenth, (ii) Anal cerci
    EXPLANATION: Alimentary canal of cockroach is divided into three parts and they are foregut, midgut and hindgut. Gastric caecae is present at the junction of foregut and midgut. It can secrete digestive juice. Tenth segment contains a filamentous structure is called anal cerci. It is present in both male and female cockroaches. Anal cerci are important sense organs of cockroaches as they can detect the vibration of things.
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