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.
For years farmers have been adding natural fertilizers to their crops. It is a big risk though. Over fertilizing is very dangerous. It puts high concentrations of salt into the soil. It can also affect the water resources nearby. Nitrogen, Phosphate, and Potassium are the basics of fertilizer. If a certain nutrient is short in supply the fertilizer might not work as well. Calcium, iron, manganese are also nutrients that might be needed. So don’t just trust the fertilizer bag that says it has all the nutrients, test it out. (Miller and Levine 717)
Have you ever marveled at the powerful stories a poem can tell with just words? I will be analyzing the similarities and differences in figurative language and the elements of Chinese poetry in the Chinese poems “I Beg of You, Chung Tzu” and “Thick Grow the Rush Leaves.”
Investigating the Effect of Light Intensity on Photosynthesis in a Pondweed Aim: To investigate how the rate of photosynthesis changes at different light intensities, with a pondweed. Prediction: I predict that the oxygen bubbles will decrease when the lamp is further away from the measuring cylinder, because light intensity is a factor of photosynthesis. The plant may stop photosynthesising when the pondweed is at the furthest distance from the lamp (8cm). Without light, the plant will stop the photosynthesising process, because, light is a limited factor. However once a particular light intensity is reached the rate of photosynthesis stays constant, even if the light intensity is the greatest.
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.
Investigating the Effect of Light Intensity on the Size of a Plantain Leaf Title: To investigate the effect of light intensity on the size of a plantain leaf. Hypothesis: I predict that the size of the plantain leaves would increase as the light intensity decreases. Therefore, plantain leaves found in the shade will have larger surface areas than leaves found in an open area. Theory: Sunlight is an essential factor need to complete the process of photosynthesis.
Plant Experimental Design i) PURPOSE: To determine whether added nutrients speed up seed germination. HYPOTHESES: "The plants with the nutrients will grow better. " ii) EQUIPMENT: 1. 10 pinto beans 2.
* Amount of sugar solution in each test tube. * The potatoes have to have the same mass.
Apparatus A ball – A marble A plastic rectangular tray – about 40cm by 25 Some sand – fills up to about 2/3 of the tray 2 Rulers – one for drop height (1m) - one for measuring the depth (15cm) Clamp and Stand 2 planks of wood – light wood/palsa (so that it doesn’t sink) Splinters – 10 cm long and 0.3mm wide Method:
Rate of Photosynthesis in Pond-Weed. Plan The aim of this activity is to investigate one of the factors that affect the rate of photosynthesis in pond weed. I am trying to find out if the distance of the pond weed from a lamp will change the rate. of the photosynthesis process.
Duckweeds can be grown in the pond water from which they were collected in open containers. It is important to replace the water frequently, since evaporation will result in concentration of salts. Using open containers prevents overheating if you place the containers outside or in a sunny window. In nature duckweeds grow in water from many sources and compositions.
Investigating Photosyntesis in Pond Weed Aim: The aim of this experiment is to find out what effects the amount of photosynthesis happening in a pond weed. Introduction: A piece of pondweed will be cut and placed into a test tube containing water and sodium hydrogen carbonate, which is placed inside a beaker containing water. A lamp will be shined on to the pondweed and the amount of bubbles released from the plant will be counted. The lamp will be adjusted to different distances from the plant to try and obtain different results. The amount of bubbles will be counted for a period of one minute.
One of the themes that Milkweed expresses throughout the plot line is survival. All the main characters in the book had to do certain things in order to survive. For example, Uri tells Misha -who at the time had no name- to “take only what he needs.” This shows that Uri really does care about Misha survival. The other skills the boys used were remaining invisible, stealing food, using a rug to keep warm, and drinking bomb crater water. If I lived in the time of World War II, in the city of Warsaw, I would probably use the skills the boys used to survive. My family would be priority, so I would make sure to steal more for each member; however, if one of my family members was dying, I probably wouldn’t try to save them because if we were to get
The following formula is used to calculate the surface area of the spherical coordinates system.
The ratio for length to width of rectangles is 1.61803398874989484820. The numeric value is called “phi”.