ANALYSIS:
1. How are arms and tentacles similar and different? The squid has four pairs of arms and one set of tentacles, but the tentacles are generally longer than the arms. They also are used for grabbing any prey, which arms do as well. However, the tentacles can move and swivel around while the arms cannot. Both the tentacles and arms have suckers as well, but the arms have larger ones. 2. How are cephalopods similar and different to bivalves? Cephalopods consists of the octopi, squid, cuttlefish, and nautilus, while the bivalves includes the clams, oysters, scallops, and mussels. Some forms of bivalves and cephalopods both contain some sort of shell (such as in the form of a quill), but bivalves have two hinged shells. However, both classes are a part of the phylum Mollusca, and use filter feeding as a form of feeding in some types. Bivalves, however, are sessile, while cephalopods are motile. Basically the main difference between the two types is that there is no shell in most cephalopods. 3. Was your squid a boy or girl? How did you determine this? We discovered our squid was a boy because it had a white and cloudy sac of sperm, as shown in photo 1. This shows the structure contains sperm. The sac of a female contains ovaries, and has more of a yellow colour. 4. Trace the path of food through your squid. To start, water is filtered through the squid's gills, and its siphon allows any particles of food to get stuck in the mucus on the gills. From there, the food is passed through a long tube to the anus, while its system of valves take in the nutrients as the food is digested. Any wastes exist out of the anus, such as ammonia. 5. Why are the brachial hearts so close to the gills? The squid is a very motile organism, and generally has to pump blood fast to move quickly. Since the brachial hearts are so close to the gills, there is a shorter distance that the blood has to travel to circulate through the squid. This helps the squid to complete actions faster and basically move quicker than organisms in the same phylum. |
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