Module 2 assignment 2.3.1 - intertidal zone
- 1. Assignment 2.3.1 - Intertidal Zone <br />Part 1: What statement best describes the splash zone of the intertidal zone? <br />Organisms in the splash zone experience the fluctuation from being entirely covered to entirely exposed. <br />Organisms in the splash zone are at the top extreme of the tidal waters, and they are not always covered by water during a tide. <br />Organisms in the splash zone are exposed only at the lowest tide.<br />What statement best describes the middle intertidal zone? <br />Organisms experience fluctuation in their level of exposure. <br />Organisms are always at the top extreme or the waves. <br />Organisms are never exposed. <br />What statement best describes the subtidal zone? <br />Organisms are only exposed at the highest of tides. <br />Organisms are only exposed at the lowest of tides. <br />Organisms are never exposed. They live below the surface of the sand. <br />Tides are caused by <br />The gravitational pull of the coastline <br />Changes in weather and current speed <br />The gravitational pull of the moon and sun <br />Opposite ends of the earth experience low tides at the same time. <br />True <br />False <br />Some areas of the earth can experience two high and low tides in one day. <br />True <br />False <br />Although tides change, temperature and salinity remain constant. <br />True <br />False <br />What is the name of the largest unbroken intertidal mudflat in the world? <br />The Chesapeake Bay <br />The Wadden Sea <br />San Francisco Bay<br />Part 2: <br />Sea anemones live in the middle tide zone, because of this there are times where the sea anemones are not covered in water. Sea anemones would dry out if they don’t have any water there for dying, but they have an adaption that solves this problem. Sea anemones can pull in their tentacles and close up to resist drying out when the tide uncovers them. There for not letting them dry out. <br />Barnacles live in the spray zone this area is dry most of the time, but is sprayed with salt water during high tides. Wave splash is often strong enough to dislodge animals from their homes in intertidal zones, but barnacles have an adaption that solves this would be problem. Barnacles use a glue-like chemical that attaches them to pilings and rocks so that they will not be dislodged from their home.<br />Mollusks live in the middle tide zone. This zone is covered and uncovered twice a day with salt water from the tides. Because of this being covered and uncovered mollusks have an adaption that protects them from desiccation. Mollusks have their shells to protect them from desiccation, so they just close up tight, when they are uncovered. <br />Crabs live in the high tide zone. This zone is flooded only during high tide, because of crabs have to move to areas with water because of this they are in danger when trying to find areas with water. Crabs have hard exoskeletons to protect them, but they can also move to areas with water or hide in burrows and crevices during the times of exposure. <br />