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Measurement and Science Tools SI Units – the units used in science Measurement Tool used Length Metric Ruler Unit cm, or mm Volume – liquids Graduated cylinder mL Volume – solids Metric Ruler LxWxH cm3 Mass Triple beam balance g Density Formula D= M / V g/mL or g/cm3 1 cm = 10 mm When reading a graduated cylinder be sure to read the bottom of the meniscus!! When reading a triple beam balance be sure to add up the total of all 3 weights to find the mass of an object. Density of water = 1g/cm3 or 1g/mL D<1 will float in water D>1 will sink in water Dissolving a solid a liquid will increase the density of the liquid! Density does not change if an object is cut in half, or doubled in size. Materials have the same density regardless of size! Topic 2 – Scientific Method Quantitative observation: Includes a quantity, a number (made using 5 senses!) Qualitative observation: Describes a quality, color, shape, size, texture (made using 5 senses!) Inference: A prediction based on your observation Example experiment design problem Read the statement below and design an experiment to test the validity of the statement. Be sure to include the following in your experiment design: Problem – stated as a question Hypothesis – If (independent variable) then, (dependent variable) Independent variable (I change, what is different between control and experimental group?) Dependent variable (what you will measure- should be in SI units!) 2 Control variables (what you will keep the same for both control and experimental groups) Statement: Rockets that have 4 fins will fly higher than rockets that have no fins. ANSWER: Problem: If I make a rocket with 4 fins, will it fly higher than a rocket with 0 fins? Independent variable: The number of fins Dependent variable: Flight height Control variables: The size of the body, the launcher, the amount of water. Hypothesis: If the number of fins increases, then the rocket will fly higher. Ecology Ecology is the study of how organisms interact with each other and the non-living environment. Organism – any living thing Biotic – living Abiotic – non-living Biodiversity – the variety of different life forms in one place Behavioral adaptation - a behavior that helps an organism survive. Ex. eating food that no other organism eats) Physical adaptation – a body part that helps an organism survive. Ex. A special shaped beak that allows birds to eat food from a specific source. Ecosystem stability depends on biodiversity o High biodiversity = healthy ecosystem o Low biodiversity = unhealthy ecosystem Characteristics of living things: Metabolism – eating and processing food Reproduce – have babies Cells – all living things are made of cells Homeostasis – living things maintain a constant internal environment Respond to environment – living things are able to move and respond to conditions like temperature, sunlight, water etc. Obtain and use energy Grow – get bigger, develop into mature adults Excrete – get rid of waste like #1, #2, and sweat Respiration – living things use the air (oxygen or CO2) to create energy MR. CHROGER The main goal of ALL organisms is to find food and reproduce! Cells and the human body Smallest Largest Cells Tissue Organ Organ system Organism Structure Function Nucleus Cytoplasm Contains genetic information (DNA) , Control center for cell Jelly like substance that fills the cell and allows materials to move around Controls what moves in and out of cell (like a door) Provides structure and shape Where PHOTOSYNTHESIS takes place, gives plants green color Cell membrane Cell wall Chloroplast Animal Cell Yes Yes Plant Cell Yes Yes Yes NO NO Yes Yes Yes Figure 7-5 Plant and Animal Cells Animal cell Section 7-2 Figure 7-5 Plant and Animal Cells Cytoplasm Nucleus Plant Cell Section 7-2 Cytoplasm Chloroplasts Cell Membrane Go to Section: Cell Membrane Nucleus Go to Section: Cell Wall Cells reproduce ASEXUALLY – the cells are able to copy themselves to create identical cells Body System Skeletal system Important Information Main function: Supports and provides shape to the body. Protects internal organs Main organs: Bones, ligaments, joints Muscular system Main function: Works with the skeletal system to provide movement Main organs: muscles Muscles contract and relax to allow movement Digestive system Main function: Breaks down food into nutrients that can be absorbed into the blood Major organs: Mouth, saliva, esophagus, stomach, small and large intestines Mechanical digestion: happens when you break something up into pieces. Occurs in the mouth when you chew, and in the stomach. Chemical digestion: Happenss when a chemical is added to food. Occurs when saliva starts to break down food in the mouth, and when stomach acid breaks down food in the stomach. Picture Main function: Pumps blood throughout the Circulatory body to transport materials like oxygen, and sugar to all cells. system Main organs: Heart, arteries, veins Arteries carry oxygen rich / carbon dioxide depleted blood AWAY from the heart INs carry oxygen depleted / carbon dioxide Ve rich blood IN to the heart Heart rate increases when the body needs more oxygen Main function: Exchanges oxygen and carbon dioxide Respiratory between the atmosphere and the blood system Main organs: Mouth, nose, lungs, alveoli Alveoli are the little sacs inside the lungs that absorb the oxygen Excretory Main function: Removes waste from the body Types of waste include carbon dioxide, salt, heat, urine, and feces Main organs: KIDNEYS, skin, mouth / nose / lungs, anus Nervous system Main function: Controls all body functions, interprets signals input from the 5 senses Main organs: Brain, spinal cord, nerve cells Body System Reproductive system Main function Main function: producing offspring (babies) Main organs in female: Ovaries, uterus, fallopian tubes, vagina Main organs in male: testes, urethra, penis FERTILIZATION OCCURS IN THE OVIDUCT / FALLOPIAN TUBES IN THE FEMALE. THE SPERM AND EGG MUST MEET IN THIS LOCATION IN ORDER TO CREATE OFFSPRING. Male sex cell - sperm Female sex cell - egg Endocrine system Main function: Releases hormones that control changes within the body – responsible for growth and development Main organs: glands that are located throughout the body Sexual and Asexual Reproduction Sexual reproduction 2 sex cells combine to create1 new organism Each sex cell contributes ½ of the genetic information Asexual reproduction - 1 cell splits to create a clone of itself. Asexual reproduction creates GENETICALLY IDENTICAL OFFSPRING! Picture Body System Immune system Main function Main function: Responsible for identifying and destroying pathogens (bad bacteria) that invade the body Picture Main organs: white blood cells, red blood cells, nose / sinus mucus membrane Nutrition Calories – a unit of measure of the amount of energy in food If a person consumes more calories than they burn, they will gain weight. If a person consumes less calories than they burn, they will lose weight. If a person consumes the same amount of calories as they burn, they will maintain their weight. Exercise increases the number of calories that a person burns. Sex (male or female) and Age (15 years old vs 65 years old) changes the normal number of calories that you need to consume every day. Nutrient Protein Carbohydrates Vitamins & Minerals Fats Water What it does! Builds and repairs muscle in the body Provide energy Strengthen body cells Store energy Hydrates the body Foods that provide it Chicken, steak, pork, peanuts Bread, rice, sugar Vegetables Cheese, milk Water…duh! Earth Science HEAT How does heat travel between different objects? Heat always moves from high temperatures to low temperatures. Objects that are heated tend to expand (get bigger) Objects that are cooled tend to contract (get smaller) Water is the exception! When water freezes it expands (that’s why ice floats in water, it is less dense!) Radiation – heat travels Through the air Convection – heat rises and cools creating a circular current. Convection causes wind Conduction – heat travels through Direct contact. This is how you get burned! MINERAL TESTS Hardness – Diamonds are the hardest naturally occurring mineral on the Earth! We can test hardness by trying to scratch a glass plate with a mineral. Streak – Minerals leave behind a colored line when scratched against a white plate Color – minerals are all different colors Acid test – If you put a drop of acid on a mineral, some minerals will react and bubble. Biosphere All the parts of the Earth that support life! Atmosphere Layer of gases that surround the Earth keeping the Earth warm enough to support life! 78% Nitrogen, 21% Oxygen, 1% Other gases: Carbon Dioxide, Hydrogen Lithosphere Solid portion of the Earth Hydrosphere Liquid portion of the Earth We live and stand on the Lithosphere Covers 75% of Earth Most water is salt water Separated into sections called Tectonic Plates Water Cycle!!! The theory of plate tectonics…The crust is separated into plates that are constantly moving. We call the movement continental drift. The plates move due to convection currents in the mantle. Magma heats up and rises, then cools and falls. PANGEA is the supercontinent that existed 300 million years ago. Sediments – formed from weathering and erosion Sedimentary rocks – formed from the dewatering and compaction of sediments. THE ONLY TYPE THAT HAS FOSSILS! Metamorphic rocks – formed from heat and pressure Igneous rocks – formed from melting rocks into magma, then cooling and solidifying Rocks are made of MINERALS!!! Minerals have properties that we can test….streak (scratching the mineral on a ceramic plate to see the color of the line left behind), hardness (trying to scratch glass with the mineral, diamonds are the hardest mineral on earth, and luster (shiny or not)