Taking a Look at Plant Abscission

This experiment, which was used to explore the Theory of Evolution created by Charles Darwin. The use of natural selection was apparent in the artificial modification of an organism's traits which aided in this investigation. Through this experiment the Wisconsin Fast Plant was used. It is a fast-growing organism developed to improve the resistance to disease in cruciferous plants. This plant aids scientist in the exploration of environmental effects on population due to the speed to which is matures and reproduces. Artificial selection was stimulated by the selection against plants with few hairs(trichomes). Trichomes create a wider variation which means it is polygenic. The plants that had only a few trichomes were

Organisms interact in ways that affect themselves in a positive or negative manner, either benefiting or harming one or both organisms. For example, in mutualism, organisms interact in a positive way that benefits them both. Competition is a negative interaction in which the organisms harm each other, and this is over a limiting resource, which is oftentimes food, water, or other necessities to the organism’s well being. There are two types of competition: interspecific and intraspecific. Interspecific competition occurs between two different species of organisms, whereas intraspecific competition is within the same species. Within the scope of plant interactions, some of the resources that plants would compete for include light, water, and nutrients in the soil (such as minerals). The reason they would compete for these resources is because plants require these specific resources for photosynthesis, the process by which they produce energy for their activities. For individual plants in competition, they both will have decreased levels of growth, survival, and/or reproduction because of the lack of resources. In terms of community composition, this is primarily determined in the amount of interspecific and intraspecific competition occurring. In a community, more species can coexist if the amount of interspecific competition is less than the amount of intraspecific competition. This is because interspecific competition directly lowers the amount of

Our class had to develop an experiment on our own that did not affect the pH of the water or the light, my group then came up with how nitrogen based plant food affected Wisconsin Fast Plants. These plants were developed at the University of Wisconsin by the professor Paul H. Williams. These plants are great for classroom environments because they grow quite fast. They were originally a type of weed from the family Brassica found in Nepal, India. Williams was trying to develop a type of disease-resistant plant. He thought if he crossed Brassica plants with cabbages and such he could get a disease-resistant plant that grew fast. He did just that, these plants will complete their entire life cycle within 40 days. Classrooms are the

After a week, the phenotypes of the plants were recorded in Table 2. The strongest plant in each cell was left in the quad, and the others were removed in order to thin the plants.

Leaf light Absorptivity: 1. The range of color that the leaf can absorb. 2. Class notes

Plants are able of detecting a multitude of stimuli, such as gravity, light or touch. Once a plant has detected a stimulus it will alter their growth plan in order to be in the most relevant location for the uptake of water, nutrients, sunlight and reproductive success. This response of a plant to particular stimuli is referred to as a tropism. For the most part, plant roots will grow downward towards the earth (positive gravitropism), yet plant stems will grow upward (negative gravitropism). Gravity is near constant on the surface of the earth in respect of magnitude and direction, hence plants detect the direction of gravity via a change in angle of certain plant organs. Plants respond to gravity in a three step process: detection, signaling

Stems root into the ground where they touch, and unwanted new plants can be moved in spring or fall. Plants are also easily divided.

Stomates are the tiny purse in the plants leaves. Stomates release oxygen and intake carbon dioxide through the tiny opening and closing purse. Photosynthesis is the process of the gas exchange through the stomates. The negative effect of the opening stomates is the amount of water lost, although the water loss through the stomates is necessary and is called transpiration. This process cannot be avoided but luckily plants can control the amount of water lost by controlling when and how big they open. The stomates open when the outside environment concertation is just right to try and avoid large water loss and the stomates don’t open at all when the outside temperature is hot as it would lose large amounts of water. On the stems of woody texturised

Unlike bacteria, plant and animal cells divide using a process called mitosis. Mitosis begins after the same basics steps in plants and animals, but there are some exceptions. Also, mitochondria divide and are pass out to both daughter cells. In photosynthetic plant cells, chloroplasts must also divide and be given away to both daughter cells.

Cells form a cleavage furrow in the middle of the cells allow it to divide. Furrowing continues to constrict two sides of the membrane until they touch. Then, the membrane fuse and the two new daughter cells are separated.

The chromosomes that are replicated are stuck to a mitotic apparatus that aligns the chromosomes and separates them evenly among both cells. The separation of DNA is known as Karyokinesis, and later cytokinesis occurs which splits the cell membrane to make two separate cells. Mitosis is a continuous process and is divided into five secular stages known as Prophase, Prometaphase, Metaphase, Anaphase, and Telephase.

Investigation 4 consisted of investigating the different stages of mitosis within organisms, such as plants and animals. The following materials were used to visually see what occurs as mitosis takes its course within a cell: onion root tips, a human leukocyte and a whitefish blastula. By definition, mitosis is “the process of cellular reproduction involving the division of the nucleus to form two identical daughter nuclei (47).” Following mitosis is the process known as cytokinesis which consists of separating the cytoplasm to form two daughter cells. Mitosis is part of the cell cycle that consists of the following stages: G1 phase, S phase, G2 phase and M phase. The first step of the cell cycle is the G1 phase where cells are

Eukaryotes undergo asexual cellular reproduction to grow in size or replace damaged tissues. The first process in the cell's life cycle is mitosis. When the chromosomes in the nucleus are duplicated, it creates two identical sister cells from the one progenitor cell. Mitosis is broken down into four phases: prophase, metaphase, anaphase, and telophase. DNA duplication occurs during a stage called interphase. Once completing the exact duplication of the cell, it is followed by cytokinesis, when the cytoplasm of the parent cell divides into two daughter cells. In plant cells, a cell plate forms between each new cell.

If there isn't enough light there the cutting will not be able to grow and photosynthesis.

replenishment from the cells that have been lost. Another layer is called the stratum spinosum which