5th

Name: Geofrey Jinuin

Class: 3 Melati

Problem Statement

: Does light effect the rate of transpiration?

Hypothesis

:Light increases the rate of transpiration.

Variable

a)fixed

:Size and types of plant, humidity, wind, temperature and time.

b)manipulated

: Presence of light.

c)responding

: Difference in weight of the apparatus and rate of transpiration.

Apparatus

:Electronic balance, conical flask, clock or watch and source of light such as sunlight or lamp.

Materials

:Young balsam plant, water, cotton wool and oil.

Procedure. 1. 2. 3. 4. 5. 6.

Set up the apparatus as shown. Weight the apparatus and record. The apparatus on the table in bright room Pace the apparatus in a cupboard or the same room. After 2 hours, observe and record. Tabulate your results and calculate the rate of transpiration.

Results. *Condition *Mass of apparatus at this beginning experiment (g) *Mass of apparatus at the end of experiment. *Rate of transpiration (g/min) Presence of light

Presence of light

163

g

158.4g

160

g

158.7g

163-160.6 90

Experiment B

=0.03 (g/min)

158.7-158.7 90

= 0.00 (g/min)