The Growth of Bean Seedlings Experiment
Growth of a Beans Experiment
Aim: To compare the growth of bean seedlings in a different soil
solution.
Background Knowledge:
Plants make there own food by photosynthesis. They need light and CO2
from the atmosphere and the water absorbed from the soil.
Plants also need very small quantities of minerals for healthy growth.
Mineral ions are absorbed through the roots from the dissolved
chemicals compounds in the soil. When garden centres sell bottles of
“Plant Food” they are selling solutions of some of the important
minerals; these can be added to the soil in which the plants are
growing. When plants are unable to absorb enough an important mineral
they show signs of deficiency.
If to little nitrate, phosphate, potassium, iron, magnesium, sulphate
or calcium is absorbed by the plant, its appearance and growth will be
affected.
For instance, potassium helps photosynthesis and magnesium is needed
for the plant to manufacture chlorophyll. If magnesium is in short
supply, the leaves, particularly the old ones become moulted or pale.
Iron is part of the chlorophyll molecule and shortage of the mineral
will make leaves pale.
A few substances, known as trance elements may even be toxic to the
plant. Copper is one of the trace elements.
Nitrate, phosphorus and potassium are the substances which are most
frequently in short supply. In soils nitrogen is the most important
because it combines with the sugar produced during photosynthesis to
form amino acids. These amino acids join together to form large
protein molecules. Plants which lack nitrogen grow very poorly.
Sugar + Nitrate à amino acids à Proteins
(From photosynthesis) (From Soil)
General Planning:
* I will take three small pots and fill them full of soil.
* I shall then put one
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