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Animal Diversity
Nematodes are commonly known as roundworms. They are free-living, very tiny organisms. They have an elongated and tubular body. These organisms have a nervous system and are mostly act as parasites to both animals and plants.
Platyhelminthes
Platyhelminthes are also known as "flatworms" because as they are dorsoventrally flattened from head to tail. They are invertebrate, soft-bodied, acoelomate, unsegmented and have bilateral symmetry.
In terrestrial arthropods, fertilization is always internal (True/False)?
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- Why are sea urchins have external fertilization? What are the adaptive advantages of external fertilization? How about internal fertilization?Describe the step-by-step fertilization process in an amphibian. Include in the discussion the structures involved in the process.Which of the following steps of sea urchin fertilization initiates the formation of the fertilization envelope? A Acrosomal reaction Fast block to polyspermy Egg activation Cortical reaction Chemo-attraction
- describe internal and external fertilization, and provide examples of animals that use each of these methods of fertilization?Give the process of internal fertilization in turtle. Show illustration how the fertilization happens inside the turtleExplain the advantages and disadvantages of self fertilization in these flatworms
- Describe the step-by-step fertilization process in an amphibian. (Please include the structures involved in the process.)Why is it necessary for the egg to have changes leading to polyspermy blockduring fertilization?In sea urchin, which step of egg and sperm recognition involves the formation of a fertilization cone? Sperm binding to the egg's vitelline membrane Fusion of the sperm and egg membranes Acrosomal reaction Chemo-attraction Sperm binding to the egg's jelly coat
- True or false male sea urchins release sperm at the optimal concentration for fertilizationDiagram out the process of fertilization in the sea urchin. Be sure to include and end with the event of fast and slow block of polyspermy. What would be good short few sentence descriptions of each step?From a 24-hour chick embryo, provide the answers in the following: Pairs of somites in a 24-hour chick embryo Germ layer/s that forms the head process What begins the formation head of process Germ layer/s that form the proamnion Explain why the notochord is not visible in areas where the somites are seen