preview

Sun And Appropriate Hypothesis

Decent Essays
Abstract
This experiment is useful since it indicates how sunlight, one of the environmental factors affect plants. The effects of sun and shade on stomata density of Tsuga heterophylla plant were investigated. The dependent variable was stomata density, and the independent variable was sunlight (sun and shade). The stomata impressions were made by using the nail polish to inscribe the stomata on the leaves bottom. The imprint was applied in the calculation of leaf stomata density. A t-test was used to compare the results between two variables (sun and shade). A significant difference of stomata density was observed between the leaves in the sun and shade. The leaves in the sun had the highest stomata density than the leaves in the shade.
Introduction
Sunlight provides energy for all organisms. This
…show more content…
How sun and shade affect the stomata density. The following questions were asked;( 1) can sun increase the stomata density? (2) Can shade increase stomata density? (3) Is it true that both shade and the sun increase stomata density? It was hypothesized that the stomata density was greater in the sun than in the shade. In this experiment, one plant species (Tsuga heterophylla) was assessed. Tsuga heterophylla is an evergreen coniferous plant.
Methods
Site description
Tsuga heterophylla was collected from Tongass National Forest. Tongass National Forest is located in Southwest Alaska in the United States of America. It is the largest national forest in the USA. The forest is part of temperate and Pacific rain forest. The experiment was performed at this site between 9.00am to 4.00pm.
Field sampling
Twelve of Tsuga heterophylla plants from sun and shade were collected. Compass was used to determine west and east; this was conducted to find the sunlight path to determine whether there were objects blocking sunlight from reaching the plant leaves. Two light meters were used to measure shade and sun leaves.
Lab
Get Access