Students Name: Luc

1
The effect of light bulbs of different power on
plant growth

• Students Name Luc
• Class Science, Period B, Grade 7
• Teachers Name Mrs. Priscila
• Date 20/02/06

2
ABSTRACT

• The purpose of this lab is to test the effect
  that light bulbs of different power have on plant
  growth. If forty watt light bulbs are used to
  provide light for a plant, then the plant will
  grow very little. If one hundred watt light bulbs
  are used to provide light for a plant, then the
  plant will grow moderately. If one hundred and
  fifty watt light bulbs are used to provide lights
  for plant, then the plant will grow significantly
  but not as much as a plant put to receive light
  from the sun. If the sun is used to provide light
  for a plant, then the plant will grow even more.
  In this experiment I will take four pots and fill
  them with soil. Then I will plant five seeds of
  the same kind in each pot. I will then place the
  different light bulbs on top of three of the
  plants. Continued

3
ABSTRACT

• Each of the three plants meant to receive
  artificial light will have a different watt light
  bulb above it. The last plant will be left
  indoors, near a window, to receive light from the
  sun. The plants will be kept apart from each
  other to make sure that the light meant to be
  received by one will not be received by the other
  as well. I will place the lamps, for the plants
  meant to be receiving artificial light, the same
  distance from the plants on all of the three
  pots. I will record observations daily at four
  oclock P.M. and at nine oclock P.M. In addition
  I will water the plants with the same amount of
  tap water everyday. After fourteen days of
  observations I will analyze my data and draw my
  conclusions. My experiment will be a research and
  field test. My data will be recorded into a chart.

4
BACKGROUND

• Poor watering and incorrect lighting are two of
  the most common causes of houseplant death.
  Plants respond to different aspects of light, its
  intensity, duration, and quality. The best
  quality light is natural daylight and wherever
  possible plants should be placed close enough to
  a natural source of light for healthy growth.
  Artificial lighting can be beneficial in the
  winter when day length and light intensity
  decrease. It is used to increase day length in
  winter resulting in things such as flowering. The
  best lights to choose are those that produce the
  highest light levels. Intensity depends on the
  type of light and the distance of the plant to
  the light source. Continued

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BACKGROUND

• Light intensity falls dramatically from windows
  during the winter. Intensity can be determined
  with a photographic light meter. Light has an
  accumulative effect in plants. With shorter day
  length in the winter the total amount of light
  received is significantly reduced. Day length
  also has an effect on functions such as
  flowering.

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PURPOSE

• The purpose of this lab is to test the effect
  that light bulbs of different power have on plant
  growth.

7
HYPOTHESES

• If forty watt light bulbs are used to provide
  light for a plant, then the plant will grow very
  little.
• If one hundred watt light bulbs are used to
  provide light for a plant, then the plant will
  grow moderately.
• If one hundred and fifty watt light bulbs are
  used to provide light for a plant, then the plant
  will grow significantly, but not as much as a
  plant put to receive light from the sun.
• If the sun is used to provide light for a plant,
  then the plant will grow even more.

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MATERIALS

• Four pots
• Twenty seeds
• Soil
• Three lamps
• Forty watt light bulb
• One hundred watt light bulb
• One hundred and fifty watt light bulb
• Water
• Pencil
• Paper

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PROCEDURE

• Gather materials.
• Read over procedure.
• Fill four pots with soil.
• Plant five seeds of the same kind in each pot.
• Place different watt light bulbs on top of three
  pots.
• Leave last pot indoors next to a window to
  receive sunlight.
• Keep plants apart from each other so that light
  meant to be received by one will not be received
  by the other.
• Make sure light bulbs are equally distanced from
  the three pots meant to receive artificial light.
• Form hypothesis.
• Observe daily.
• Analyze results.
• Draw conclusions.