PolyLearning

16. Embryo of Taenia is inside egg and contain chitinous hook that are in number
a. 6
b. 7
c. 5
d. 9
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Answer: (a).6

17. An example of marine colonial that exhibits alternation of generations is
a. star fish
b. Obelia
c. jelly fish
d. sea urchin
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Answer: (b).Obelia

18. Skeleton of sponges is composed of needle-like structures called
a. spicules
b. ostia
c. osculum
d. spongecoel
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Answer: (a).spicules

19. Tasmania wolf found in Australia belong to class metatheria and termed as
a. marsupials
b. reptiles
c. mammals like reptiles
d. amphibians
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Answer: (a).marsupials

20. Glandular epithelia envelope which secretes calcareous shell is called
a. chitin
b. exoskeleton
c. mantle
d. core
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Answer: (c).mantle

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