8. Hermatypic corals have mutualistic algal cells in their tissues called A) cor

Question

8. Hermatypic corals have mutualistic algal cells in their tissues called A) coralline algae B. zooxanthellae C. kelp D euglena E colloblasts 9. Throughout most cnidarian groups, the basal or pedal disc serves to A be the base of the tentacles. B. attach the cnidarian to the substrate. Cgenerate buds. D. perform extracellular digestion. E. harbor sensory cells 10. In flame cells, A light is detected. B. ciliated sperm are stored. C. undigested food is expelled. slow fires burn food for energy E. cilla drive fluids through tubules for excretion. 11. Monogeneans hatch as A fully mature adults C-B. free-swimming larvae. -C. flagellated, amoeboid larvae. D. Tarvae resembling gemmules of freshwater sponges ENone of the choices are correct 12. The correct sequence of development in a typical fluke life cycle is A egg, miracidium, cercaria, sporocyst. B. egg, miracidium, sporocyst, cercaria. C. egg, sporocyst, cercaria, miracidium D, egg, cercaria, miracidium, sporocyst egg. sporocyst, miracidium, cercaria. 13. A farmer in a rice paddy in Asia becomes infected with the liver fluke by A. eating infected snails. B. drinking water contaminated with eggs. eating infected fish that is undercooked or uncooked. D/ swimming or wading in infected water, where the cercariae enter the skin. E: None of the choices are correct 14. Torsion A. involves movement of the shell independent of visceral movements. B. rotates the shell between 90 and 180 degrees C begins with the contraction of an asymmetrical foot retractor muscle D, shifts the anus from posterior to the right side of the body EAlof the choices are correct

Explanation / Answer

8. Most hermatypic corals establish symbiotic or mutualistic association with marine algae. These algae live in tissues of corals are known as zooxanthellae carryout photosynthesis and provide food to corals and obtain shelter from them. Therefore, option B is correct.

9. Most of the cnidarians have sedentary lifestyles. They attach to the substratum by basal or pedal disc. They capture small preys coming their way or form mutualistic associations with algae or filter feeders. Therefore, option B is correct.

10. Flame cell is excretory organ found in flatworms, rotifers and in some nematodes. These function similar to kidneys and eliminate the wastes. The flame cell bundles are called protonephridia. Flame cell contains a cup shaped nucleated body surrounded with flagella. The beating of flagella gives the appearance of flame. The cup is attached to tube cell lines with cilia. The cilia draw the fluids and move them out through external opening or nephropore or excretory bladder. Therefore, option E is correct.

11. Monogeneans are ectoparasites found on skin, gills or fins of fishes. These exhibit direct lifecycle without any intermediate host. The eggs of monogeneans hatch to produce free swimming larvae. Therefore, option B is correct.

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