Do Now What is the proper way to write a hypothesis? Why must their be a control and experimental group in an experiment? How is the experimental group different from the control group? What is the definition of an Independent Variable? What is the definition of a Dependent Variable? If ____________, then ______________. To compare results It contains one change (The Independent Variable) What “I” change The data collected during an experiment

Reviewing the Penny Lab Control Group How was the experimental group different from the control group? Experimental Group

Reviewing the Penny Lab What materials were placed in the control group? What materials were placed in the experimental group? What was the independent variable in the experiment? What was the dependent variable in this experiment? State one way to perform this lab safely. Penny Dropper Water Penny Dropper Water Soap Soap Amount of Drops Goggles

Practice Regents Question A certain plant has white flower petals and it usually grows in soil that is watered with tap water. Sometimes the plant produces flowers with red petals. A company that sells the plant wants to know if the acidity of the fluid used to water the plants affects the color of the petals in this plant. Your Job: Design an experiment to determine if acidity affects petal color. Hint: Acidic Liquids include lemon juice, orange juice, and coffee.

Practice Regents Question Experimental Group Control Group How could the experimental group be different from the control group? Based on the reading what color should the petals be in experimental group? Why?

Practice Regents Question State Hypothesis List the materials in the control group List the materials in the experimental group How is the experimental group different from the control group? What is the Independent Variable in this experiment? What is the Dependent Variable in this experiment? State one set of data that you collect that would support your hypothesis. If I water the plants with _______, then the petals will be _______. Sun Plant Water Soil Sun Plant Water Soil Acid Acid Acid Color of Petals The plants watered with acid had red petals

Use the glossary to look up Key Words Have your homework ready to be checked.

Homeostasis: Maintenance of a stable internal environment despite changes in the external environment. Feedback Mechanism: Cycle of events that lead to the maintenance of homeostasis

What happens when you are hot? Body Temperature Rises Brain Signals Body to Sweat Body Stops Sweating Body Temperature Lowers

What happens when you are cold? Body Temperature Lowers Brain Signals Body to Shiver Body Stops Shivering Body Temperature Rises

What happens to you blood sugar after you eat? After You Eat Blood Sugar Rises Pancreas Secretes Insulin Insulin Secretion Stops Blood Sugar Lowers

Biology is the study of life and life is not perfect! Equilibrium: Perfect Balance Biology is the study of life and life is not perfect! Dynamic Equilibrium: Fluctuation around balance.

What is living? If it is made up of one or more cells If it contains DNA (Instruction manual for life) If it carries out all 8 life process (Metabolism)

Nutrition: Obtaining needed substances Autotrophic Nutrition- (Photosynthesis) Organisms “automatically” have food Heterotrophic Nutrition- (Eating/Hunting/Gathering) Organisms need to obtain their food from the external environment

2. Transport: Movement of needed substance around the body or cell

3. Respiration: Using oxygen and nutrients to make energy Why do we breath???? Oxygen makes ATP ATP = ENERGY!

4. Excretion: Removal of toxic waste

5. Regulation: Communication used in the maintenance of homeostasis

6. Growth: Increase in size and cell number

7. Synthesis: To make new

NOT NEEDED FOR THE SURVIVAL OF THE INDIVIDUAL!!! 8. Reproduction: Increases population size NOT NEEDED FOR THE SURVIVAL OF THE INDIVIDUAL!!!

Metabolism: Sum of all 8 life processes Unicellular organisms use organelles to maintain homeostasis. Organelles are in the Cell! Multicellular organisms use organelles and organs to maintain homeostasis

Organism Organ System Organs Tissues Cells Organelles

Remember: What is living? If it is made up of one or more cells If it contains DNA (Instruction manual for life) If it carries out all 8 life process (Metabolism) Biology is the study of living organisms and how they interact with their environment. Abiotic: Non Living Factors Biotic: Living Factors

List 3 Abiotic and 3 Biotic Factors

List 3 Abiotic and 3 Biotic Factors

List 3 Abiotic and 3 Biotic Factors