Biology Laboratory Test Notes

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Florence Tesha
Biology T-Test Lab
Ms Robson

Research Question: How does the amount of water present 5m from the ocean and 20m away from the ocean affect the circumference of the coconut trees ten metres from the ground?

Aim: To find out how the amount of water available 5m from the ocean and 20m away from the ocean affects the circumference of coconut trees ten metres from the ground.


➢ The coconut trees found 5m from the ocean receives more amount of water than those found 20m away from the ocean. Therefore I expect that the circumference of coconut trees found 5m from the ocean will have a greater circumference than those 20m away from the ocean. One reason is, water is a very essential element of plants (coconut trees) therefore availability of water will enhance the growth of the coconut trees in height and circumference. It is also a possibility that the soil 5m from the ocean has more nutrients and minerals because it is moist hence support these other elements but the soil 20m from the ocean will probably be a little dry since they do not receive enough water hence will contain few nutrients and minerals. Nutrients and minerals support the growth of plants (coconut trees) therefore the circumference of coconut trees 5m from the ocean will be greater than those 20m from the ocean.


➢ Independent Variables – amount of water ( we estimated that the amount of water 5m from the ocean will be greater than that 20m away from the ocean ).

➢ Dependent Variables – circumference of the coconut trees measured 10m from the ground. (cm )

➢ Controlled Variables

• Same species of trees: We only measured the circumference of coconut trees. Other trees have different sizes of their circumference because of their type of species or other factors. This could interfere in our data collection thus the species measured was only of the coconut trees

• Circumference of the coconut trees was measured from the same height from the ground (10m): The circumference of coconut trees differs as the height changes. Usually they are broader on the bottom and they get thinner as the height increases. Therefore the circumference of the coconut trees measured was only from 10m from the ground.

• Number of coconut trees measured: The circumference was measured from twenty coconut trees, ten from each area. This was to ensure that we prevent errors of some of the trees which might have been affected by other factors like diseases, stunted growth or human influence (adding fertilizer to the coconut trees).

• Same tape measure: we used the same tape measure for all the twenty trees to control instrumental error in case (zero errors) of any.

• Same age of the coconut trees: The coconut trees that we measured their circumference were of the same age (8 years back, 2004). It is obvious that younger coconut trees will have a lower circumference than older coconut trees therefore in order to prevent this effect, we asked the indigenous people of that area, and after we measured the required metres from the ocean, they showed us all the trees planted 8 years back. From those, we only chose 8 coconut trees and measured their circumference.

Materials used: 10m tape measure, 100m tape measure, pen, pencil, notebook, thick black marker, calculator


▪ First of all, we took a 100m tape measure and one person stood at 0m from the ocean and held the tape measure from 0m mark. Another person rolled the 100m tape measure straight ahead to a point of 5m from the sea, and we named that area of 5m from the sea “AREA A”. By doing so, we already got our first area of measuring circumference of the coconut trees.

▪ Then we kindly asked Zachariah who’s 47 years of age and has lived in that area all his life working as a fisherman, to help telling us the age of the coconut trees found in...
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