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Effect of the Hormone Gibberellic Acid
on the Growth of Dwarf Peas
Objective
In this experiment students will grow genetically dwarf and tall peas with and without
gibberellic acid to measure the effect of this hormone on growth.
Problem
How does the plant hormone gibberellic acid affect the growth rate and dwarf
character of peas?
Hypothesis
Gibberellic acid will increase the growth rate of genetically dwarf peas. ... One hormone, gibberellin, stimulates cell division and enlargement in
normal peas. ...
Materials
2 gallons potting medium
3 flats with segmented inserts
Package tall pea seeds
Package dwarf pea seeds
Vial gibberellic acid paste (500 ppm)
Toothpicks
Centimeter ruler
3 clear plastic lids or cellophane
Procedure
1. ... Label the first flat “control dwarf peas,” the second flat “gibberellic dwarf peas”
and the third “control tall peas. ... Using a toothpick, smear gibberellic acid on the dwarf seedlings 2 mm thick from
the soil to the tip of the plant. ... 8 cm, while the gibberellic acid-treated group of dwarf
peas had an average height of 35.
Approximate Word count = 783
Approximate Pages = 3.1
(250 words per page double spaced)
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