ub to will result in lost points. Multiple Choice/True and False sora f the fres
ID: 209290 • Letter: U
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ub to will result in lost points. Multiple Choice/True and False sora f the freshwater organisms, more freshwater clams are becoming endangered than other speoes K. They are a primitive animal and they are due for natural extinction reason? species. What is the tkeh B. The shellfish industry has moved inland and we are overharvesting them for human 1oo 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 molluses are hermaphroditic, most molluscs are either male or A. asexual. B. sexual. parthenogenetic. 17. Which of the following characteristics could be demonstrated using earthworm? r dioecious reproduction b) monoecious reproduction c) reciprocal mating (exchange of sperm) d) 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. Of the freshwater organisms, more freshwater clams are becoming endangered than other species, what is the likely reason?
Answer: D. As filter-feeders, they concentrate pollutants and are more likely to be harmed by water pollutants.
Water pollution due to agriculture run off, shore line development due to which clean water is polluted and it is the major cause for the freshwater clams that are becoming endangered.
16. Although snails and some other molluscs are hermaphrodite, most molluscs are either males or females, a condition called
Answer: D. Diocious
Monecious are those which has both male and female reproductive organs in the same individual characterised as hermaphrodite.
Diocious are those which have male and female reproductive organs in the separate individuals characterised as male and female.
17. Which of the following characteristics could be demonstrated using earthworms?
Answer: E monoecious reproduction and reciprocal matting (exchange of sperm)
Monecious are those which has both male and female reproductive organs in the same individual characterised as hermaphrodite.
During reproduction 2 individual earthworms exchange the sperm this type is also called as reciprocal matting or cross fertilization.
18. Polychaetes
Answer: A. Belong to the smallest and most evolutionarily derived class of annelids.
Poly means numerous chaetes means hairs. These are the marine worms belong to phylum annelida. They are also called bristle worms.
19. In earthworms, the typhlosole
Answer: B. Increases the absorptive area of gut.
Earthworm intestine is folded to form typhlosole, which increase the gut area in order to increase the absorption of food.
20. Chelicerate arthropods possess
Answer: A. Pedipalps.
Chelicerae are present before the mouth that is in the second segment. Pedipalps are present after the mouth that is in the third segment.
Chelicerates are the ancient group of arthropods they do not have antenna, no mandibles and has four pairs of appendages for walking.
Example: spiders, scorpions, mites, horseshoe crabs
21. The correct sequence in the life cycle of the jelly fish Aurelia is
Answer: C. plannula, Scyphistoma, ephyra
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