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How Does Colour Affect Plant Growth?

By Lyceyy123 Apr 21, 2011 697 Words
To find out if colour affects plant growth, and if plants are adaptable to the colour of light, and how much light it gets. INTRODUCTION
For this Science assignment, I chose to find out if the colour and amount of light a plant receives, affects plant growth. Light is electromagnetic radiation that comes in waves, the basic units of which are called photons. Plants use light to turn carbon dioxide into sugars necessary for growth, a process called photosynthesis (putting together with light). Sunlight is a full spectrum of different wave lengths of light. Seen through a prism, this spectrum turns into bands of color: red, orange, yellow, green, blue, indigo and violet. The color of light measures its quality. Plants absorb light that they use to grow and to produce flowers, fruits and seeds. Plants look green to us because they reflect green light. They don't absorb it. So plants are unaffected by green light. Plants use other colors of light to fulfill basic needs of their life cycle. Plants are most affected by blue light and red light. The color of light is a major consideration when you grow plants indoors. Fluorescent light that contains lots of blue light is good for starting seeds indoors. Full spectrum fluorescent light will encourage growth and flowering. The light produced by a metal halide lamp is intense blue, which is good for growing plants. Some greenhouses use high-sodium grow lights that yield abundant red light, to induce flowering and fruiting. HYPOTHESIS

The cress under the clear cellophane, will grow the best.
¬ 10 plastic pots
¬ 30 cress seeds
¬ Clear, red, blue and green cellophane
¬ Tap water
¬ Potting mix
¬ Tape measurer
¬ Spray Bottle
¬ Sticky tape
Pour a small amount of soil into each pot, approximately 5cm deep. STEP TWO
Place 3 seeds in each pot, and press down slightly (Do not cover with soil). STEP THREE
Spray enough water in each pot, to saturate the soil.
Tape a piece of clear cellophane over two pots, green cellophane over two pots, red cellophane over two pots, and blue cellophane over two pots. STEP FIVE
Observe the cress' behavior over two weeks, move the position of the cress from full sunlight, partial sunlight and no sunlight on alternate days. Record the height each day. DIAGRAM

No CoveringClear CoveringRed CoveringBlue CoveringGreen Covering Day11111
Day 77777

During the experiment period, I encountered no issues, besides the fact that towards the end; the cress with blue cellophane over the top started dying. I probably could have left the cress in the light arrangement (Full, partial and no sunlight), to see if it made a difference. CONCLUSION

Plants that are under red and/or green covering will grow better than say, a plant under clear or blue covering; most likely because they can retain water more easily.

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