Factors that Affect the Growth in Duckweed
Introduction
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For healthy growth plants need several substances. Three important
mineral ions that can only be obtained from the soil through their
roots are nitrates, phosphates and potassium. Nitrates are essential
for making amino acids and for the 'synthesis' of proteins. Phosphates
are essential as they have an important role in reactions involved in
photosynthesis and respiration. Potassium is also important as it
helps the enzymes involved in photosynthesis and respiration to work.
The three main minerals are needed in fairly large amounts, but other
elements are required in much smaller amounts. Iron and magnesium are
the most important as they are needed to make chlorophyll.
Without photosynthesis, along with minerals, plant growth wouldn't
take place. Photosynthesis produces glucose for 'food' and takes place
in the leaves of all green plants. Glucose is combined with nitrates
(collected from the soil) to make amino acids, which are then made
into proteins. Protein amino acid contains carbon, hydrogen, oxygen
and nitrogen. Along with potassium, phosphorus and sulphur make up the
important substances that travel through the roots and up the stem.
Photosynthesis needs carbon dioxide, water, light and chlorophyll to
continue the process. Without iron and magnesium chlorophyll couldn't
be made and therefore the plant would die.
Diffusion takes place in the leaves, through the stomata. The
membranes allow substances in and out as particles from an area of
high concentration move to an area of low concentration. This takes
place in the example of NO4. There...
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...n back to the petri dish
We could do the same experiment but instead of weighing, we could
count the number of leaves. Or we could use squared paper to find the
surface area by taking a sample of 10 or 20 - this would give a good
range. Another way is to harvest 100 duckweeds, dry them in the oven,
and then weigh the dry mass of the dead duckweed. We would weigh
different samples from the same conditions every week. However, by
taking more out, the duckweed left behind have less competition for
nutrients. So we could put 100 duckweeds in 6 petri dishes with the
same concentration and would prove to be more accurate over a period
of 6 weeks. The fertiliser increases the growth up to a point. We
could put the duckweed at the bottom of a graduating tube, fill it up
with water, and measure the amount of oxygen each week.
These pebbles were picked out randomly. We took 100 pebbles from each end and measured their length using a ruler and used the shape chart to decide what shape the pebbles were. First we had go... ... middle of paper ... ... ehicle.
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The “Fast Plant” experiment is an observation of a plants growth over the span of twenty-eight days. The objective is to observe how plants grow and use their resources throughout the span of their life. In our lab we observed the Brassica rapa, a herbaceous plant in the mustard family which has a short cycle which makes it a perfect plant to observe in this experiment. Like other plants the Brassica rapa must use the resources in the environment to create energy to complete itʻs life cycle and reproduce. By observing the plant it is easy to see in what organ or function the plant is using itʻs energy and resources and if overtime the resources switch to other part of the plants. By conducting this experiment we are able to observe where and how plants allocate their resources throughout their life by harvesting plants at different points in their life.
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The following formula is used to calculate the surface area of the spherical coordinates system.
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