This experiment was performed to test two hypotheses concerning the plant hormone gibberellic acid and a mutant rosette shaped phenotype of the plant Brassica rapa. This experiment was done in order to test the effects o gibberellic acid on plants and its effect on rosette shaped complexes. The two hypotheses in this experiment are as follows: Hypothesis number one states that Gibberellic acid allows for stem elongation in plants. Hypothesis number two. The rosette complex in the rosette phenotype plant contains less gibberellic acid naturally and therefore grows shorter.
Plant hormones are certain chemicals present in plants that control plant growth and development by affecting the division, differentiation, and elongation of cells. (Campbell, 2008) Each hormone has multiple effects depending on its site of action, its concentrations, and the developing stage of the plant. (Campbell, 2008) Auxin is a plant hormone that is synthesized within the apical meristems and young leaves of a growing plant. Auxin stimulates stem elongation when it is present is low concentrations. It promotes the formations of lateral and adventitious roots, regulates development of fruit, enhances apical dominance, functions in gravitropism and phototropism, promotes vascular differentiation, and retards leaf abscission. Gibberellic acid is one of several plant hormones that govern a plant’s growth. Gibberellins allow for stem elongation in plants. Plants without enough of this hormone tend to grow short or stunted. This chemical is high in the element potassium, which is one the main components of plant fertilizer and very important for plant growth on its own. The...
... middle of paper ...
...aller or weaker looking of the two was taken out and destroyed. Once there was only one plant left within each cup, the plants were measured, watered, and replaced on the shelf to receive more light.
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.
Need Writing Help?
Get feedback on grammar, clarity, concision and logic instantly.Check your paper »
- A titration is used to determine the amount of acid in a given solution. This is done by titrating a measured volume of acid (in this instance, acetic acid (CH3COOH)) with a solution of a strong base (usually sodium hydroxide (NaOH)), of a known concentration. The NaOH is added in small aliquots until the acid has been neutralised, and this can be determined with an indicator dye, such as phenolphthalein, or a pH meter (Nelson & Cox, 2008 pg58). In this practical, a pH meter was used and this allows for the acidity or alkalinity of a solution to be measured, and this was more accurate than using an indicator dye.... [tags: PH, Acid dissociation constant, Acetic acid]
1393 words (4 pages)
- An acid is a substance that produces H+ to form a solution that has a pH <7. It turns litmus paper red. It reacts with bases to form a salt and water. A weak acid is an acid that dissociates incompletely, releasing only some of its protons(H+). A strong acid is an acid that fully dissociates incompletely, releasing only some of its protons(H+). A base is a substance that can accept (H+) and releases(OH-) to form a solution that has a pH>7. It turns litmus paper blue. It reacts with acids to form a salt and water.... [tags: Acid, Base, Chemistry]
1065 words (3 pages)
- Fischer Esterification is a unique type of esterification first discovered by Emil Fischer and A Speier in 1895. Fischer Esterification is a mechanism of which an ester is formed as a product when a carboxylic acid is treated with an alcohol and an acid catalyst. Together with ester, water is also liberated on this reaction. The key bonds formed in this reaction is C-OR, of which the oxygen bonded to carbon is the oxygen from the alcohol, not the oxygen originally bonded to it from the starting carboxylic acid.... [tags: Acetic acid, Carboxylic acid, Ester, Oxygen]
1015 words (2.9 pages)
- Some people think that acid rain can burn skin if it lands on them. This however, does not happen. Acid rain can not burn skin, it still can causes damage to plants, animals, and even structures. Acid rain occurs naturally without human interference, but since humans started to make objects that contribute to the creation of acid rain, it happens more frequently than if humans would not be involved. People not only raised the amount of acid rain that falls, they can also be the ones to bring the amount back down to reasonable levels.... [tags: Acid rain, Water, Volcano, Oxygen]
1170 words (3.3 pages)
- Rain occurs nature as part of the water cycle, but sometimes rain can do more harm than good. Acid rain can causes damage to plants, animals, and even structures. Acid rain occurs naturally without human interference, but since humans started to make objects that contribute to the creation of acid rain, it happens more frequently than if humans would not be involved. People not only raised the amount of acid rain that falls, they can also be the ones to bring the amount back down to reasonable levels.... [tags: Acid rain, Water, Oxygen, Sulfur dioxide]
1660 words (4.7 pages)
- From concentrations of 0 ppm to 2500ppm, there is a clear trend created between the gibberellic acid (GA3) concentrations and the germination rate of the seeds. With the exception of the 1000ppm data point, as the seeds were exposed to water with higher gibberellic acid concentrations (up to 2500ppm), they showed a reduction in the time taken for a visible seedling to break the surface coating of the seeds. This overall trend confirmed the first aspect of the hypothesis, which stated that increasing gibberellic acid concentrations would lead to faster germination rates.... [tags: Germination, Seed, Gibberellin, Abscisic acid]
1242 words (3.5 pages)
- Titration is a technological process in which a solution, known as a titrant, is slowly and carefully added from a burrette into a fixed volume of another solution (known as the sample). In an acid-base titration an acid neutralizes a base or vice versa. This process is maintained untill the reaction between the titrant and the sample (acid and the base) is judged to be complete. The reaction is judged to be complete when the endpoint is reached. An endpoint in a titration analysis is referred to as the point at which no more titrant is added due to an observable colour change of an indicator.... [tags: PH, Acid, Hydrogen ion, Acid dissociation constant]
1053 words (3 pages)
- THE RAPA NUI The Rapa Nui In this paper I will discuss the Rapa Nui and their arrival on Easter Island. I will cover the basic history of the Rapa Nui and their discovery and habitation of Easter Island. Further, I will review topics such as culture, marriage and family, religion, traditions and more. Rapa Nui is more commonly known as Easter Island, a province of Chile. Its official Spanish name is Isla de Pascua. It is one of the most isolated inhabited islands on earth, located in the southeastern Pacific Ocean.... [tags: Culture]
1339 words (3.8 pages)
- The Differences between Strong acid and Weak Acid Titration Introduction: This experiment is to explore the certain properties of strong acid (HCl) and weak acid (HCOOH) and how these properties make effects on titrations. The first is to find out the properties and differences of strong acid using phenolphthalein measurement and curve measurement. The second step is to find out the properties and differences of weak acid using phenolphthalein measurement and curve. The final step is to compare the salts that produced.... [tags: PH, Acid, PH indicator, Acid dissociation constant]
1150 words (3.3 pages)
- Acid Rain Acid rain has become an environmental concern of global importance within the last decade. With the increasing environmental awareness of the "unhealthy" condition of our planet earth the concern about acid rain has not lessened. In brief, acid rain is rain with pH values of less than 5.6. When dealing with acid rain one must study and understand the process of making Sulfuric acid. In this project we will take an in depth look into the production of sulfuric acid, some of its uses and the effects of it as a pollutant in our environment.... [tags: Acid Rain Environmental Nature Essays]
3205 words (9.2 pages)