16. In the figure below of a cross section throegh an earthworm, which structure

Question

16. In the figure below of a cross section throegh an earthworm, which structure carries posterior directioe? blood in an anterior to 17. In the figure above, which structure (A-E) has an osmoregulatory function? 18. Earthworms undergo (direct/indirect) development in a cocoon-like stracture formed by the D. indirect, clitellum (n0 "E-) A. direct; typhlosole B. indirect, typhlosole 19. Dioecious describes organisms that A. develop first as males & later switch to females C. direct; clitellum B. possess both testes & ovaries C. possess either testes or ovaries D. reproduce both sexually & asexually E. both choices A & D apply Please use the figure below to answer the following THREE qoestions. 20. The above represents what type of sponge architecture? A. polyploid 21. The osculum is indicated by letter 22. The filtration of food from water occurs in the area indicated by letter Please use the figure below to answer the next question. B. leuconoid C. syconoid D. planuploid E. asconoid LLJ 23. Which of the three figures (left, middle or right) indicates the condition seen in members of the Annelida? A. left B. middle C. right

Explanation / Answer

16)ventral blood vessel (c) carries blood in the anterior to posterior direction

17)nephridium has the function of osmoregulation ( d)these are tube like coiled structures

18)D) indirect method of development ,Cocoon like structures are formed by the clitellum which is a swollen glandular ring like structure

19)c) that posses either testes or ovary

Both testes and ovary will not be present in a single organism in dioecious species

Two distinct organisms are present in which one has testis and the other one will have ovary

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