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Structural Organisation in Animals Test - 30

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Structural Organisation in Animals Test - 30
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  • Question 1
    1 / -0
    In earthworm, the enteronephric nephridia opens in 
    Solution
    Septal and pharyngeal nephridia discharge their waste products into the alimentary canal including buccal cavity and intestine, they are called as enteronephric nephridia. 
    Therefore, the correct answer is option D.
  • Question 2
    1 / -0
    Earthworm is ........... when water availability is reduced.
    Solution
    Ureotelic organisms are those that excretes excess nitrogen as urea. Urea is their major excretory product. Earthworms excrete urea as major excretory product and so is ureotelic. Ammonotelic, amminotelic and uricotelic organisms excrete excess nitrogen as ammonia, amino acids and uric acid respectively. So, the correct answer is option C.
  • Question 3
    1 / -0
    If an earthworm releases cocoons from posterior end instead of anterior end then 
    Solution
    Earthworms are the tube-shaped segmented bisexual organism. The saddle-like ring found in the epidermis of the worm covers several segments toward its anterior end. To form the cocoon for its eggs, the clitellum secretes a viscous liquid which forms a ring around the worm. The mating pair overlaps the front ends ventrally and exchanges the sperm which is later injected into the eggs in the cocoon where the embryonic worms develop. If cocoon is released by the posterior end then sperm will not reach the cocoon and fusion will not take place. So, the correct answer is option D.
  • Question 4
    1 / -0
    Earthworm is known to posses
    Solution
    The dorsal and ventral vessels are connected to each other in segments 7, 9, 12 and 13 by means of paired pulsatile hearts. The hearts in 12th and 13th segments are called as lateral oesophageal hearts, while the anterior pairs in the 7th and 9th segments are called as lateral hearts. So, the correct answer is option A.
  • Question 5
    1 / -0
    Which of the following is found in earthworm?
    Solution
    Lateral heart is the blood pumping organ, which is found in earthworm. It is found in the 7th and 9th segments. Hence, option B is correct answer.
  • Question 6
    1 / -0
    Common feature between cockroach and earthworm is
    Solution
    The ventral nerve cord makes up the nervous system of some phyla of the invertebrates, particularly within the nematodes, annelids and the arthropods. It usually consists of cerebral ganglia anteriorly with the nerve cords running down the ventral plane of the organism. This characteristic is important in qualifying the difference compared to the chordates, which have a dorsal nerve cord. It is present in both cockroach and earthworm. 
    In biology, a hermaphrodite is an organism that has reproductive organs normally associated with both male and female sexes. Many taxonomic groups of animals (mostly invertebrates) do not have separate sexes. It is present in only earthworms. 
    Moulting of the cuticle is present only in the cockroach
    Excretion by nephridia is found only in earthworms
    So, the correct answer is 'Ventral nerve cord'
  • Question 7
    1 / -0
    Earthworm is friend of farmers, because it 
    Solution
    Earthworms re-distribute organic materials within the soil, increase soil penetrability and under certain conditions, influence ion transport in soils. So, earthworms influence the supply of nutrients in several ways thereby increasing the fertility of the soil. Hence, they are considered as good friends of farmers. So, the correct answer is option C.
  • Question 8
    1 / -0
    If a T.S. is done through 20$$ ^{th}$$ segment of Pheretima, it will contain 
    Solution
    The prostate glands extend from 16$$^{th}$$ to 21$$^{st}$$ segment and are made of glandular and non-glandular parts. The intestine is wide tube and is divided into the post-typhlosole region in segments 15-26. Thus, the T.S through the  20$$^{th}$$segment will have intestine and prostate gland both. So, the correct answer is option D.
  • Question 9
    1 / -0
    Which one of the following is the oldest use of earthworm?
    Solution
    Earthworms are the original natural bait. The earthworms are easy to find and also they work on a wide variety of fishes and so is used as a bait since ages.
    So, the correct answer is option A.
  • Question 10
    1 / -0
    Tessellated epithelium is present in:
    Solution
    The tessellated epithelium is present in the endothelium. Squamous epithelium having only one layer, such as in endothelium, mesothelium, and pulmonary alveoli are also called pavement epithelium or tessellated epithelium.
    Hence the correct option is B.
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