internal assessment rate of transpiration

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Research question

How can the rate of transpiration of plant at different atmospheric condition namely light, humidity of air, and speed of air be measured?

Hypothesis

Transpiration is a process where plant losses its water in form of water vapuor to surrounding via stomata. This will cause losses of amount of water initially from apparatus to surrounding. Therefore, rate of transpiration under different atmospheric condition can be obtained by measuring the weight loss of of entire apparatus by using spring balance. As the light intensity is hihg, humidity of air is low, and speed of wind is high, the rate of transpiration will be higher.

Introduction

Transpiration is a process where plant losses its water in form of water vapuor to surrounding via stomata. Transpiration process can be affected by different atmospheric condition such as light, humidity of air, temperature and also speed of winds.

Aim

To measure the rate of transpiration of a cut twig under different atmospheric condition namely light, humidity of air, and speed of wind.

Materials and method

Refer to attachment page 83

Variables

There were three sets of apparatus arrangement. Each apparatus has different variables. The apparatus were categorized to SET A, SET B, and SET C.

 Variable for SET A

Independent        : Intensity of light

Dependant        : Amount of weight loss of entire apparatus

Constant        : Humidity of air, speed of wind, type of plant, numbers of leaf.

Variable for SET B

Independent        : Humidity of air

Dependant        : Amount of weight loss of entire apparatus

Constant        : Intensity of light, speed of wind, type of plant, numbers of leaf.

 

Variable for SET C

Independent        : Speed of wind

Dependant        : Amount of weight loss of entire apparatus

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Constant        : Intensity of light, humidity of air, type of plant, numbers of leaf.

Data collection

Quantitative data

SET A

Table 1; the mass of entire apparatus in SET A experiment for rate of transpiration of plant in different light intensity with respect to time.

SET B

Table 2; the mass of entire apparatus in SET B experiment for rate of transpiration of plant in different humidity of air with respect to time.

SET C

Table 1; the mass of entire apparatus in SET C experiment for rate of transpiration of plant in different speed of wind with respect to time.

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