a pts)20. A biologist recently surveyed the intertidal zone of a small island in
ID: 206656 • Letter: A
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a pts)20. A biologist recently surveyed the intertidal zone of a small island in the South Pacific. One of the organisms she collected had a long segmented body with leg-like projections on each segment. Each projection also possessed little hairs on them. There were hardened jaws on the anterior most segment. This animal was most likely in the Phylum and the class (2 pts) 21. Is the figure to the right an example of coiling or torsion? Is it dextral or sinistral? (2pts) 22. Give two adaptations of cephalopods that reflect their active lifestyle. (2 pts)23. Give two means of respiration demonstrated by molluscs (2 -24. Which body region secretes the shell in molluscs? A. Head-foot B. Visceral mass D. Radula (2pts)25. In terms of poriferan sexual reproduction, choanocyte is to sperm as is to ovum. t)26. Which type of aquiferous (canal) system is exhibited by the figure at the right? 27. What type of cell is responsible for capturing food particles inside a A. Pinacocytes B. Choanocytes C. Collenocytes 2 pts, 28· In the box to the right sketch a cnidarian medusa. 4 pts) 29. Give two characteristics that distinguish cnidarians from A biologist recently made an expedition to the Amazon Rainforest. On the trip she collected an organism new to science. I possessed six jointed legs and had three body regions. The mouth had a pair of mandibles and a pair of maxilla along with a few other parts. There was one pair of antennae on the head. The interesting thing about it, though, was how it was colored. The abdomen was red with black spots, while the thorax was white and the legs were black. Use the preceding paragraph to answer the following two questions.Explanation / Answer
The phylum Annelida and the class Polychaeta.
Explanation:
1. Annelida is A phylum of multicellular invertebrates which are mainly free living and typically marine aquatic animals.
They include true segmented worms. Many of these worms have tentacles on their heads and a pair of leg like projections called parapodia on each body segments.
Earthworm and leeches belongs to this phylum.
The class of mentioned animal may be of polychaeta.
They possess hard jaws that could mineralize with iron oxide.
21. The figure shown is an example of coiling and it is a dextral.
Explanation
1. Torsion is A twisting process in which larva undergo a counterclockwise rotation of its body seen in gastropods whereas the coiling is A process in which shell becomes contorted into a cone or spiral shape.
A central is a right hand side rotation whereas cinistral is a left handed rotation of the shell.
Thus, the figure shows right handed spiral shaped snail so it is coiling and dextral.
22. Two adaptations of Cephalopods:
1. One of the most famous defensive adaptations of Cephalopods is their ink. It is used to distract a predator and allow a squid or octopus to escape quickly. Thus, ink not only provides a visual distraction but also it disrupts a operator's sense of smell and taste.
2. Get paid and color change: many cephalopods are capable of remarkable and rapid color change. When they are trying to avoid a predator, they may swim over sand, rocks and grass in quick succession with each change of substrate, the ceatures color instantly changes to match it.
23. Two means of respiration in molluscs are:
1. Skin and mantle: the outer covering of the body i.e. skin and mantle usually act as accessory respiratory organs.
2. Ctenidium: aquatic molluscs respite through ctenidia which are comb like outgrowth of the mantle and are located within the mantle cavity.
3. Lungs or pulmonary sacs are the third means of respiration in molluscs.
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