Name: _________________________________________ Class 6.1 or 6.2 Science 6 – Life Science Chapter 2 Homework Review – Section Review Questions Unit1: The Study of Living Things -- Chapter 2: It’s Alive! R, Is It? Section 2.1 – Characteristics of Living Things – Pg. 47 1. 2. 3. 4. 5. 6. 7. 8. Sunlight can be a STIMULUS (pg 39) Living tings are made of CELLS (pg 38) Homeostasis means maintaining A – STABLE INTERNAL CONDITIONS (pg 39) Sexual reproduction – two parents produce offspring that will share characteristics of both parents. Asexual reproduction – a single parent produces offspring that are identical to the parent. The six characteristics of living things are: 1. Living things have cells. 2. Living things sense and respond to change. 3. Living things reproduce. 4. Living things have DNA. 5. Living things use energy. 6. Living things grow and develop. Gen1 - 1 bacteria. Gen2 – 1*2= 2 bacteria. Gen3 – 2*2 = 4 bacteria. Gen4- 4*2 = 8 bacteria. Gen5 – 8*2 = 16 bacteria. Gen6 – 16*2 = 32 bacteria. Light/dark – your pupils dilate. Heat – you sweat. Cold – you start shivering. The fur coat of a bear helps the bear maintain it’s internal body temperature. Section 2.2 – The Necessities of Life 1. Producer – can make their own food. Consumer – can not make their own food – they must eat other organisms to get food. (pg 43) 2. Lipids is the term that describes all types of lipids – which are compounds that cannot mix with water. Phospholipids form membranes of cells. Fats & oils store energy (pg 46) 3. Plants store extra sugar as B starch (pg 45) 4. Organisms need: a. Food – because food gives organisms energy and the raw materials needed to carry on life processes (pg 43) b. Water – because most of the chemical reactions involved in metabolism require water. Your cells and the cells of almost all living organisms are approximately 70% water (pg 42) c. Air – because most living things use oxygen in the chemical process that releases energy from food. Oxygen may come from the air or may be dissolved in water. Green plants, algea and some bacteria also need carbon dioxide for photosynthesis. In photosynthesis, green organisms convert the energy in sunlight to energy stored in food (pg 42) d. A place to live (shelter) – because shelter contains all of the things they need to survive. Note – space on earth is limited, so organisms often compete with each other for food, water, and other necessities. 5. The chemical building blocks of cells are Proteins (pg 44), Carbohydrates (pg 45), Lipids (pg 46), ATP (pg 46) and Nucleic Acids (pg 47) 6. Decomposers are categorized as consumers because they can not make their own food. They are not like producers because again, they can not make their own food. 7. The subunits of proteins amino acids. Some proteins are made up of only a few amino acids, but others contain more than 10,000 amino acids. (pg 44) 8. 9. Life as we know it could not exist on earth if air contained only oxygen, because green organisms such as plants, require carbon dioxide for photosynthesis. These organisms are producers, and if producers could not make food, consumes would have not food, and would die out. 10. A cave could serve as shelter, and ant could be food, and the lake could be water for the organism. End of Chapter 2 Review Questions 1. Homeostasis 2. Heredity 3. Consumer 4. Carbohydrate 5. Lipid 6. D 7. B 8. A 9. B 10. C 11. C 12. A 13. pg. 40: Sexual reproduction – 2 parents, offspring share characteristics from each parent Asexual reproduction – 1 single parent, offspring are identical to parent 14. pg. 42: Most living things use oxygen in the chemical process that releases energy from food. Oxygen may come from air or be dissolved in water. Green plants need carbon dioxide for photosynthesis. 15. ATP is adenosine triphosphate. ATP is the major energy carrying molecule in the cell.