Th e small organs of equilibrium in scyphozoan jelyfihes are caled borne in more

Question

Th e small organs of equilibrium in scyphozoan jelyfihes are caled borne in more complex sense organs called rhopalium (2 pts) and these are Since flatworms and ribbon worms lack a coelom or a pseudocoel, they are termed animals. (2 pts Most monogeneans are external parasites of Eish -4.Polychaetes crawl by means of leg-lkepep gathering. (2 pts) 6. The anterior-most and posterior-most portions of the 2 pts) which also serve in respiration (2 pts) organs are ciliated sensory pits or slits that appear to be chemoreceptive for food respectively. (2 pts) annelid body are the pm tonium. and pvedim, . The tongue-like, rasping organ in the head of many moluses is the radula (2Ps) Differentiation of a head end (found mainly in bilaterally symmetrical animals) is called (2 pts) 9. Sponge beds have been heavily "Fished" for bath sponges and in other cases polilution or an imbalance in organisms has stated other sponge beds. What is the likely overall consequence of this in the ocean environment? (3 pts) sms wilt tose habitats or means of prorection. as many sponges are other organiSms us elte ora cven means a some spedes 10. Why does the wound from the bite of a leech bleed profusely? (2 pts) Because their saliva contains an anth-coagulare ohich erevents crotting of he blood For eiolutron to occur, there needs to be random 11 Using the concepts of evolutionary development, explain how we get variation within a species (5 pts) wmor ome tra ts erform loetter than others and their carriers will bue on to mate, et ou for varied genotypes. There also needs tbe speake genes expressed F there s ranciom mating those expressed genes can ausabe dl pes mon be expressedl different d as the vered Coral reefs generally are limited in gedgraphic to shallow marine waters How do you explain this observation? (2 pts) since corais need sunlight and nutrient rich waters+hwerteed vat ers whe in mere shaleu e things r moré abunclant. Their means of 0snorequation o cannot fahe non-sai nared water, so they are cormis will generatly onig be found Cordus will gen any foundl in marine habirars

Explanation / Answer

statocysts: these are referred to as sensory receptors of balance. Acoelomate: the one that does not have a coelom. Fish. Parapodia: fleshy protrusions that are present on the side of marine gastropods. Nuchal: ciliates pit or groove that is there at the prostomium’s posterior end. Prostomium: this also referred to as the acron and is the first segment present in the body of the annelid. Radula: rasp like structures that are used for food scraping from the surface so thsf it would be drawn in the mouth. Cephalisation. Sponges are Extremely delicate, if there would be a complete loss of sponges, there would be loss of the system of filtering in the ocean. There are many smaller organisms thsf would be relying on the sponges to obtain food. Because the saliva of the leech contains an anti coagulant hirudin, which is an anti thrombin that would prolong the bleeding time of the leech bite wound. Evolution is a process that occurs as a result of random mating. When there occur changes in the characteristics of a person, which have been inherited, there would be a resulting evolution occuring over many generations. Due to evolution, there would be changes at the species level, coming up from the level of the organisms,s as well as molecules. The variation that we observe in an organism is as a result of genotypic variation. A variation at the genotypic level would lead to a cariation at the phenotypic level, when this genetic variation gets accumulated over time, it leads to evolution. As a result of natural selection, one allele is chosen over the other, resulting in the changed or the new phenotype to be chosen, resulting in evolution. The reef building corals have presence of mutualistic algae that are present in their tissues, which are referred to as zooxanthellae. These are important to the reef building corals, which help in water absorption as well as light absorption. This results in the corals being restricted to upper depths and are hence rarely observed below depths of 30m.

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