Environmental Lab Report

Topics: Plant, Water, Light Pages: 3 (709 words) Published: May 9, 2013
HAEF Psychico College


TITLE OF LAB : Investigation of the impact of overpopulation in biodiversity

Objective of the investigation: To investigate the impact of climate change in biodiversity

Research Question: How does the temperature change ( each pot will be held in 35°C,  20°C,  10°C,  0°C,  -10°C respectively) influence the growth of lettuce plants calculated from the measurement of the weight of each plant every 2 days, for a duration of 3 weeks. The independent variable of my experiment will be the temperature of the room each plant will be in while the dependent will be the increase in weight of each plant(measured in g)

Hypothesis : According to my research , the optimal temperature for lettuce to grow is about 17-19°C. We know that for growth to occur, photosynthesis must be greater than respiration. High temperatures (35°C) cause increased respiration, sometimes above the rate of photosynthesis. This means that the products of photosynthesis are being used more rapidly than they are being produced as a result the growth will not be sufficient and the lettuce plant might even die. On the contrary low temperatures ( 0°C , -10°C ) can result in poor growth. Photosynthesis is slowed down at low temperatures. Since photosynthesis is slowed, growth is slowed. As a result, I expect that the plant which will be held in 20 will have the greatest growth.


Independent : The independent variable of my experiment is the temperature of the greenhouse (made of glass) that each pot will be held. I will control temperature using a temperature regulator, a machine that is relatively small so it can easily fit into the greenhouse and is able to produce temperature as low as -10°C and as high as 40°C . Dependent : The dependent variable of our experiment is the increase in weight of each plant(measured in g). After the end of the experiment I...
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