Each question requires you to use critical thinking skills in order to correctly respond. Changes involve both the species making up the community and their abiotic environment. Does anyone know the answer about the phloem stuff? I would urge you to think very carefully before studying the Materials option. The albatross consume this plastic and feed it to their chicks, resulting in significantly high mortality rates. I made detailed notes from the textbook and the syllabus for each topic and then condensed them down into flashcards. In order to see any pattern in the results there needs to be a range of buffer solutions covering pH5 to pH9 at least.
An Rf value retardation factor can be calculated for a pigment which helps its identification. Also, I wrote Xylem as the structure labelled X, could it be anything else? Three repeats would usually be sufficient. Try to answer the question before you read the options. The changes that transform ecosystems over time. The investigations may be laboratory based or they may make use of simulations and data bases. So although mass is important so will be shape as this will change the surface area if it is different. Coral-reef ecosystems are nutrient poor, and this represents a bottom-up limiting factor availability of resources to free-living algae population growth.
For more reliable results more mesocosms would be needed so there could be repeats. Insecticide that was used widely in the mid-20th century for disease control by vectors such as insects and then as agricultural insecticide. Outline some of the practical difficulties you might encounter in the construction of such a mesocosm, and suggest some precautions which might be taken to avoid harm to students or the animals in the mesocosm. This looks to be the most challenging Option based on both content and difficulty of exam question. Options A and C Materials and Energy share content with the previous Options of Chemistry in Industry and Technology and Environmental Chemistry, Option B Human Biochemistry unsurprisingly has shared content with the old Biochemistry option and Option D Medicinal Chemistry has shared content with the old Medicines and Drugs option. The sciences are taught practically.
Explain how you would set up an investigation of pH using buffer solutions. ? However, these ten items form the basis for questions in Section A and so it is crucial that you are aware of what practical work might be examined as well as when to take extra notes in class. The chemoreceptors are located in the medulla oblongata, the aorta and the carotid. Those schools employ over 70,000 educators, teaching more than one million students worldwide. I have created a list of all the things you need to be able to draw with diagrams.
Measurements could be taken each week for a couple of months, or even longer. Paper 3 consists of data-based questions, and short-answer questions based on the options. The time taken for the movement. Marine plastic debris and macroplastic are major concerns for marine animals as they can be mistaken for food and ingested. I have taught and written about the Options many times in the past few years and my honest belief is that the Medicinal Chemistry option is the simplest and most sensible to study unless you have a clear strength in Physics or interest in another topic.
A biologist extracted green pigments from a crushed leaf. Fortunately, scientists are also able to organize these many facts around several core concepts. The Options are varied and contain multiple subtopics and it is unlikely that any single teacher is an expert in all of them. Be sure you know what the question is asking. At one end of the scale is the cell, its molecular construction and complex metabolic reactions.
Flairs Make sure to choose a flair for your username! Particularly for Q4, break it up into sections. While the scientific method may take on a wide variety of forms, the emphasis on a practical approach. If there was a bubble of water under the filter paper then the bubble would expand in size and the water in the capillary tube would not move. Develop a list of this terminology and additional terminology from your research and linked to the Case Study. Respiration is a metabolic pathway controlled by enzymes, so the data gives us some information about the factors which affect enzymes. You will not earn more than 5 points but including extra responses is a good idea just don't contradict yourself. There would need to be five identical mesocosms each containing the same organisms.
Practical 4 - Separating photosynthetic pigments by chromatography. For example, if you are eating breakfast along, lay your notes out in front of you instead of checking on your social media. Many discoveries remain to be made and great progress is expected in the 21st century. Section A was the more difficult part, imo, especially on the Aphid question. If you fall into the latter category then make sure you collect as many resources as possible to help you.
Free-living algal blooms can disrupt coral reef communities by blocking sunlight and preventing photosynthesis in the symbiotic zooxanthellae. If you have any say in which Option you study you might want to consider these thoughts. The zebra mussel is an invasive species in the North American Great Lakes region, transported there by the ballast water of cargo ships. This means that some questions from older past papers link provided at bottom of page are just as relevant to the course you are taking. The distance a pigment travels depends on the paper, the solvent and these forces. Read the top level markband. Questions may involve describing, explaining or calculating based on the data provided.