Measurement of height of vegetable roselle
The experimental set up is illustrated on Figure.1. The
optical glass filter was fitted to one end of short tube and
the other end joined to a bigger tube. The tubes were
painted black to prevent reflection or transmission of
white light from the bulb to the surroundings
The day the seeds were planted in the pots, each pot
was placed under a particular color at suitable distances
from the source of the color. The period of germination of
seeds for each color was reported. The height and
thickness of plants in each pot were measured using
traveling microscope and vernier calipers respectively as
in Table1. The temperature was monitored by means of a
temperature probe placed alongside the plants in the pots
since heating due to the light can cause change in
temperature and hence photosynthesis and growth. This was done by adjusting the intensity of the light incident on
the plant by moving the bulb toward or away from the
plants.