Lemna Coursework
Introduction
Lemna are small water plants found in ponds. Typical of plants, they
reproduce asexually. When they reproduce they form a bud on the edge
of a leaf, which, when big enough, will eventually separate from the
mother leaf and can then reproduce itself. Sometimes lemna plants can
have up to 3 or 4 buds. Exactly the same as plants in soil, they use
the sun's energy for photosynthesis, and water, but they have to take
all their nutrition to grow and reproduce from the water. I am going
to look at how lemna are affected by deficiencies in nitrogen, iron
and magnesium.
Question
How do lemna plants cope in environments lacking certain mineral salts
- nitrogen, iron and magnesium?
Photosynthesis equation
sunlight
carbon dioxide + water ààààà glucose + oxygen
chlorophyll
sunlight
6CO2 + 6H2O ààààà C6H12O6 + 6O2
chlorophyll
Prediction
I predict that the lemna in the complete culture solution will thrive,
growing and reproducing at a high rate. This therefore means that by
the end of our experiment these lemna will be the greatest in number.
I also think that they will remain green and healthy, and should have
no abnormalities or deaths. This is because the lemna have all the
mineral salts that they could ever possibly need in order to grow and
reproduce. To photosynthesise, plants need carbon dioxide and water as
basic raw materials. However, they also need many different mineral
salts, which help the plant to grow, make chlorophyll and
photosynthesise among other things. All green plants need, in order of
importance, nitrogen, potassium, calcium, magnesium, phosphorus,
sulphur and other trace elements which are needed in tiny quantities,
which include iron, copper and manganese. I have shown the importance
of these minerals in the form of a pie chart. See following page.
potassium
calcium
nitrogen
trace elements
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A complete culture solution contains all of these minerals; therefore
Photosynthesis consists of the following equation: Sun light Carbon dioxide + Water = = == == ==> Glucose + Oxygen Chlorophyll Chlorophyll is a substance found in chloroplasts, found in the cells of leaves.
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As the light is increased so would the rate of photosynthesis. Apparatus: boiling tube, 250ml beaker, bench lamp, ruler, sodium
to this rigid structure of the plants and so, it is very useful as a
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1) It is also cultivated both indoors and out for the production of its flowering tops.
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own roots (not just the plant kind), this meant they needed a structure that was different than
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