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
[IMAGE]
A complete culture solution contains all of these minerals; therefore
Two members of the group were instructed to visit the laboratory each day of the experiment to water and measure the plants (Handout 1). The measurements that were preformed were to be precise and accurate by the group by organizing a standardized way to measure the plants. The plants were measured from the level of the soil, which was flat throughout all the cups, to the tip of the apical meristems. The leaves were not considered. The watering of the plants took place nearly everyday, except for the times the lab was closed. Respective of cup label, the appropriate drop of solution was added to the plant, at the very tip of the apical meristems.
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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to this rigid structure of the plants and so, it is very useful as a
As a result of these factors, the flora has adapted to these conditions in a variety of ways including their shape, leaf type, root system, and color. One of the most prominent adapt...
...ong, and shorter stalks are 20-100mm long. The flower length from the axils are one to three centimeters long. The optimum flowering time is from May through August. The fruit are pod shaped with seedlings coiled into two to three spirals with a strong net vein three to four millimeters long (montanaplant-life.org).
Fruiting heads often remain on trees over winter. Fair seed crops occur every year and bumper crops about every 3 years. The staminate and pistillate of Sweetgum is monoeciouse. The small, greenish flowers bloom from march to early May, depending on latitude and weather conditions. Both the staminate and pistillate flowers occur in heads. The staminate inflorescences are racemes; the solitary pistillate flowers are globose heads that that form the multiple head, 2.5 to 3.8cm in diameter, of small, two-celled capsule. The lustrous green color of the fruiting heads fades to yellow as maturity is reached in September to November. The beaklike capsules open at this time, and the small winged seeds, one or two per capsule, are then readily disseminated by wind. However, the seed balls can be safely collected for seed examination several weeks before ball discoloration occurs without harming the seed. Empty flowers are quit sensitive to cold and often damaged by frost.
What are the six (6) language arts recognized by the leading language arts/English professional organizations?
own roots (not just the plant kind), this meant they needed a structure that was different than
[IMAGE]Carbon dioxide + water Light Energy glucose + oxygen Chlorophyll [IMAGE]6CO2 + 6H20 Light Energy C6 H12 O6 + 6O 2 Chlorophyll Photosynthesis occurs in the leaves of the plant in the palisade layer. Chlorophyll in the cells in the palisade layer absorb light for photosynthesis. The plant releases the oxygen created in photosynthesis back into the air but it uses or stores the glucose for energy, respiration, growth and repair. The leaves and plants are also specially adapted for photosynthesis in their structure and cell alignment. Preliminary Experiment Apparatus * Piece of Elodea Canadensis * Bulb * Voltmeter * Test tube * Beaker * Box *
1) It is also cultivated both indoors and out for the production of its flowering tops.
long as their roots can sustain nutrients. Also, it can grow even without putting fertilizer or any
An Experiment to Investigate the Effect of Light Intensity on the Rate of Photosynthesis. Introduction Photosynthetics take place in the chloroplasts of green plant cells. It can produce simple sugars using carbon dioxide and water causing the release of sugar and oxygen. The chemical equation of photosynthesis is: [ IMAGE ] 6CO 2 + 6H20 C 6 H12 O 6 + 6O2 It has been proven many times that plants need light to be able to photosynthesize, so you can say that without light the plant would neither photosynthesize nor survive.
FMS 170-02: Freshman Seminar: Social / Behavioral Studies was my favorite course this fall semester. I honestly didn’t know it was originally called God and the Constitution. If I had known that, I probably wouldn’t have taken the class. However, I am so thankful and glad that I did.
Asexual propagation is the process through which reproduction without passage through the seed cycle occurs. The advantages of asexual propagation are that it preserves genetic makeup, propagates seedless plants, disease control, rapid production, the plants are identical, cheaper, faster and easier reducing or avoiding juvenility. The disadvantages of asexual propagation are that it increases disease and insect susceptibility, plants are bulky, and the mother plants could become contaminated. The goal of this experiment was to determine the development of adventitious roots and shoots, and observe these plants over a period of five weeks. Due to auxin being produced in the tip, tip cuttings should root faster than any other cuttings. Auxin is a plant hormone that is responsible for cell elongation and enlargement, root formation, and growth. There are two forms of auxins; phototropism, which is produced in the tip and moves downward on the side away from the light and gravitropism, which is where plant roots grow downward and plant shoots grow upward.(Plant Auxin 201...