Question

please help me with these question. i know its a lot but they are very short. this is my last post for the month. if u cant answer all i understand. thank you so much!

Which of the following characteristics is found in cephalopods but NOT in other mollusks? Radula Metanephridia Closed circulatory system Mantle cavity

Answer 1

1.(c.) Closed circulatory system is found in cephalopods but not in other mollusks.

2. all nematodes are parasitic or/ otherwise cause harm to animals or plants is (b.)False

• C. elegans is an exception

3. Are chelipeds of crustaceans and pincers of scorpions considered to be homologous structures is (b.)False

• they have different origins and hence are not homologous

4. in indirect flight muscles, muscles (c.)attach to the exoskeleton, and you see this in (c.)bees.

5. Molting can be induced in crabs by removing the eyestalks. This technique stimulates molting because removing the eyestalk removes (a.)X organ, which secretes (a.)Molt Ihibiting Hormone.

6. (a.) Onycophora do not have jointed legs.

7. The homolog of juvenile hormone produced by some trees will have the following effect on insect development- (c.) The insect will be able to molt, but won't metamorphose into adult stage.

8. nematode use hydrostatic skeleton, their -(b.) flexible cuticle and longitudinal muscles for movement.

9. (c) molluscs and (d.) arthropods serve as intermediate hosts for parasitic nematodes.

10. horseshoe crab blood- (e.) it clots in response bacterial contamination.

11. The (b.)X organ secretes MIH.

12. During ecdysis in crustaceans, the epidermis first secretes- (c.)epicuticle