Elodea Plant Lab

Aquatic Photosynthesis of Elodea Leaves Lab Design Problem: What is the effect of temperature (warm, cool, room temperature) on the rate of photosynthesis in Elodea leaves measured by the levels of dissolved oxygen in the flask solutions? Hypothesis: If temperature is related to the rate of photosynthesis (levels of dissolved oxygen) then increasing the temperate will increase the rate of photosynthesis up to an optimal temperature. Variables: Independent: temperature of the water bath which the Elodea plant is immersed in Dependent: the rate of photosynthesis measured by the level of oxygen dissolved in the flask solution Constants: Relative size of the Elodea leaf, relative surface area of the Elodea leaves, (around 3 cm each), volume of water in all beakers, amounts of light exposure to the plants, and type of light source. Method: Materials: Light Source Elodea. Keep this warm and illuminated before you use it, 3 small flasks, 0g/L sodium bicarbonate (NaHCO3) solution, oxygen sensor Lab Quest data logger. Graduated cylinder Hot Plate 3 Large beaker (1 for warm water, 1 for cool water, 1 room temp) 3 thermometers Procedure: ) Day one: Before beginning the actual lab-Listen for teacher instructions and familiarize yourself with the LabQuest datalogger and its functions using the quick start guide. We will devote this day to learning how to use the

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Plankton - Marine Biology,Scientific Paper

Construction of a food web based on the species located in the Clyde Sea. Introduction We will be sampling the waters of the Clyde Sea to attempt to create a food web of the plankton recorded. We will examine the relationship between key species and inorganic and organic mater found in the waters. The diversity of plankton in the Clyde Sea is immense. We will only select a few species to create our food web, as creating a food web for the entire recorded species will be next to impossible for us. The Clyde Sea is situated on the South West coast of Scotland and is surrounded by the Shetland Islands mainland Scotland. The land masses that surround the Clyde sea offers great protection from strong prevailing winds and other whether fronts from the Atlantic to the wildlife located in the sea. Materials and methods Water samples were taken form the Clyde Sea using Zooplankton nets. We had a range of different mesh sizes. The first was a course net: 710?m. The second was a medium mesh: 335?m. The third was a fine mesh: 142?m and the last was a very fine mesh size: 90?m. These different mesh sizes would hopefully catch a range of plankton from Mesozooplankton to Picoplankton. The water samples would be taken back to the lab where we would attempt to identify the individuals to species level. To do this we would use different microscopes, depending on the size of organism and

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  • Subject: Biological Sciences
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