Abstract Intraspecific and interspecific competition plays a major role in stabilizing environments. These mechanisms ensure that no species can go beyond its environments carrying capacity. The purpose of this lab is to determine the effects of density on biomass of plants and the effects of predators and abiotic factors in an environment. This will be tested with the spinach plant Spinacia vulgaris of varying densities in the same sized pots and with the use of P. aurelia, P. bursaria and P. caudatum divided into control and experimental groups. The results showed that the increasing of the density leads to a decrease in the biomass of plants and that the experimental groups are not much different than the control groups.
This is because there will still be a lot nutrients and soil left behind from the previous ecosystem. Therefore less ammonification and nitrification will be needed as the soil will already be suitable for more complex plant species. Natural succession can therefore be altered by both nature and human intervention, take stud land bay psammosere ecosystem for example that is deliberately cut back so that you can
1) Monocots are shorts for “Monocotyledons” which means plants whose embryo has one cotyledon; whereas, Eudicots (Eudicotyledons) carry embryo with 2 cotyledons. The cotyledons of eudicots supply nutrients for seedlings, but the cotyledons of monocots store some nutrients and act as a transfer tissue for nutrients stored elsewhere. Five key features are typically used to distinguish monocots from eudicots; a seed, arrangement of vascular tissue in roots, stems, and leaves, and number of flower parts. The seed has the reproductive structures that are protected from drying out, have male and female gametophytes which are reduced in size. In young dicot stems and stems (usually the upright, vertical portion of a plant transports substances to and the leaves) that do not increase in thickness, xylem and phloem are arranged in vascular bundles in the cortex.
The sexually transmissible disease gonorrhea has become increasingly resistant to treatment with antibiotics. What is the most likely scientific explanation? a) The gonorrhea bacteria learned to avoid antibiotics b) The gonorrhea bacteria changed their genes when they sensed antibiotics c) Antibiotic-sensitive gonorrhea bacteria died out, but antibiotic-resistant gonorrhea bacteria have flourished and persisted d) The antibiotic increased the mutation rate in the gonorrhea bacteria e) Both b and d 26. Which statement best describes the relationship between plants and animals on earth? a) Plants produce O2 and sugars from CO2 b) Animals produce CO2 and H2O from sugars and O2 c) Plants produce O2 and sugars and animals produce CO2 and H2O d) Animals produce O2 and sugars and plants produce CO2 and H2 27.
3) What does the taproot system do? Often stores organic nutrients that the plant consumes during flowering and fruit production. 4) Why are root crops such as carrots, turnips, and sugar beets harvested before they flower? Because the taproot system stores organic nutrients in the root part. 5) What is the system where no roots stand out as the main one?
What is the benefit of the modification? Because the GM tomatoes can remain fresh longer they have time to ripen in the sun before picking, resulting in a better tasting tomato! 4. Three advantages of genetically modified foods Longer lasting foods can be more easily transported, Having extra vitamins in food help poor people from becoming malnourished or going blind, and the insecticides inside some genetically modified plants keep farmers from having to spray the whole place down with toxic wastes, and they also 5. A counter argument to one of the disadvantages of genetically modified food Some antibiotics can be transferred to humans and make it harder for us to fight infections, genetically modifying foods could potentially put farmers out of work, and some important insects could be at risk because of the insecticides in foods.
orientating leaves at rights angles to the sun to reduce the surface area exposed to sun 2. dropping leaves if the temperature becomes too cold or under times of heat stress to reduce metabolic processes 3. seed germination and budding when temperature increases * Some Australian native plants, such as banksias and wattles, respond to temperature changes provided by bushfires by triggering the release or germination of seeds * The Process of Homeostasis * For an organism’s cell to function properly, it need relatively constant internal conditions. The chemical process of living systems are controlled in the cell by enzymes, enzymes work best at certain temperatures * An Enzyme is a Biological Catalysts – proteins made up of amino acids linked and then folded * A catalyst is a general term for any substance that speeds up or brings about a chemical change without itself being used up in the reaction * Homeostasis is the process by which organisms maintain a relatively stable internal environment * The Process of homeostasis consists of two stages: 1. The organism detects changes from the stable state such as change of
If they were banned, farmers would have to use a different substance, which could also have other damaging effects maybe not on bees, but on other beneficial insects or even humans. Yet, the United States could take steps in order to ensure these pesticides are used more sparingly or push to discover a new, unharmful pesticide. Heather Pilatic of the Pesticide Action Network, recommends a return to pest management strategies used widely through the 1990s, when pesticide-treated seeds and genetically modified crops allowed farmers to modify their growing strategies. This could help ensure less of the pesticides are exposed to the bees and keep them safer and able to coordinate properly. If our nation would work together to cut down on these awful chemicals, the bees would start to
Due to the lack of filtration, families had been drinking water from the rivers that had later tested positive for cholera. (Cherry, 2010). The Foundation is currently working to restore the filtration plants. Following their goals of a sustainable community, Hope for Haiti also has a reforestation initiative. The goal is to replant the mountainsides, and to plant crops such as grapefruits, mangoes, cashews and coffee to name a few.
Branch infections are not too serious; stem infections are — they are often lethal. However, stem infections usually arise from branch infections. Pruning infected branches can prevent infections near the stem from growing into the stem, where they are likely to girdle and kill the tree. If the branch dies before the fungus reaches the next larger branch or stem, the fungus is done for. If it colonizes the stem, especially when it is small, the tree is done for.