h lost points. Multiple Choice/True and False 15. Of all of the freshwater reaso
ID: 207114 • Letter: H
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h lost points. Multiple Choice/True and False 15. Of all of the freshwater reason? ater organisms, more freshwater clams are becoming endangered more A They are a primitive animal and they are due for natural extinction than other species What is the Mely B. The shelifish industry has moved inland and we are overharvesting them for human food C. Clams are more heavily parasitized than any other molluscan group DAs filter-feeders, they concentrate pollutants and are more likely to be harmed by water pollution E. All of the choices are correct 16. Although snails and some other molluscs are hermaphroditic, most molluscs are either male or female. a A. asexual B. sexual. callied Ddioecious. E: parthenogenetic 17. Which of the following characteristics could be demonstrated using earthworms? b) c) d) dioecious reproduction monoecious reproduction reciprocal mating (exchange of sperm) a & c 18. The polychaetes A belong to the smallest and most evolutionarily derived class of annelids B. are mostly freshwater inhabitants C. are mostly terrestrial, living in moist soil. D. consist of active predators and sedentary particle feeders E. cannot tolerate brackish or marine salinity. 19. In the earthworm, the typhlosole A. is the organ of locomotion. B. increases the absorptive area of the gut. C. grinds the food. D. produces secretions during mating. E. coordinates the contractions of the digestive system 20. Chelicerate arthropods possess A. pedipalps. B. antennae. C. mandibles. D. three pairs of walking legs. E. All of the choices are chelicerate features. 21. The correct sequence in the life cycle of the jellyfish Aurelia is A. planula, ephyra, scyphistoma. scyphistoma, planula, ephyra. planula, scyphistoma, ephyra. ephyra, planula, scyphistoma. E. None of the choices are correctExplanation / Answer
15) The correct option is D. As filter-feeders, they concentrate pollutants and are more likely to be harmed by water pollution
16) The correct option is D. dioecious.
It is a characteristic of a species that have the male and female reproductive organs in separate individuals.
17) The correct option is B. Monoecious reproduction.
It is a characteristic of a species, which have both the male and female reproductive organs in the same individual; hermaphrodite such as earthwaorms.
18) The correct option is D. consist of active predators and sedentary particle feeders
The Polychaeta is also called as the bristle worms. This includes active predators, herbivores, filter feeders, scavengers, and parasites.
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