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Sec. 2:1 (Unit 1) Book Work # 4 & 5 (pg 31)

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Sec. 2:1 (Unit 1) Book Work # 4 & 5 (pg 31)

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  1. Unit 1 Book Work AnswersSection 2:1 Living Things and Their Partsanswer # 4, 5 (pg 31)Section 2:3 Special Cell Processesanswer # 13, 15 (pg 41)Chapter 2 review questionsUsing Main Ideas: ans. # 20, 21, 26 (pg 45)Section 30:2 Communitiesanswer # 7, 8, 9 (pg 640)Section 30:3 Energy in a Communityanswer # 11, 12, 13, 14, 15 (pg 643)Chapter 30 review questionsUsing Main Ideas: ans. # 22, 23 (pg 651)

  2. Sec. 2:1 (Unit 1) Book Work # 4 & 5 (pg 31) • 4. Why is cellular respiration necessary to living things? • Cellular respiration is necessary to living things b/c food is broken down & energy is released.

  3. Sec. 2:1 Book Work # 4 & 5 (pg 31) • 5. Write a paragraph about a nonliving thing not mentioned in this section. Describe the features of living things that the non-living thing has. • Answers will vary. • Ex. Car • organized (into different systems) • respond to stimuli (stepping on the gas  speed up) • maintain homeostasis (temperature control so it doesn’t overheat) • use energy (requires gasoline to function)

  4. Sec. 2:3 (unit 1) Book Work # 13 & 15 (pg 41) • 13. How are tissues & organs different? • An organ is made of tissues. • 15. What are the living parts that make up an organ system? • Cells, tissues, and organs are the living parts that make up an organ system.

  5. Unit 1--Ch. 2 Review # 20, 21, 26 (pg 45) • 20. How are growing & developing different? • Growing is increasing in size (usually by increasing the # of cells). • Development is changing in shape & form.

  6. Ch. 2 Review # 20, 21, 26 (pg 45) • 21. Why are humans called organisms? • The human body is a living thing made up of organ systems such as the circulatory, reproductive, & nervous systems. • 26. What characteristics of living things does a cell have? • A cell has all the characteristics of living things (organization, response to stimuli, homeostasis, growth & development, reproduction, adaptation & evolution, & using energy)

  7. Sec. 30:2 # 7, 8, 9 (pg 640) • 7. How are producers different than consumers? • Producers make their own food (by photosynthesis or chemosynthesis) and consumers must take in food (b/c they can’t make their own). • 8. Why are decomposers important to a community? • Decomposers recycle nutrients so that other organisms can use them.

  8. Sec. 30:2 # 7, 8, 9 (pg 640) • 9. Which of the following groups are necessary to life on Earth: producers, primary consumers, secondary consumers, decomposers? • All of them b/c plant take in the nutrients and pass them on when they are eaten by the primary consumers. Secondary consumers get the nutrients by eating the primary consumers. Decomposers recycle the nutrients so they can be used again.

  9. Sec. 30:3 # 11-15 (pg 643) • 11. Why must primary consumers eat large numbers of plants? • B/c producers use most of the energy from the food they make (for cellular processes) & also lose some as heat, only a small amount (~10%) of the food energy produced is available to the primary consumer that eats the producer. Therefore, primary consumers must eat large numbers of plants to get the energy they need for their cell processes & growth

  10. Sec. 30:3 # 11-15 (pg 643) • 12. Which would be affected more by the loss of a species—a food chain or a food web? Why? • A food chain would be more affected by this loss than a food web b/c in food webs the same producer or consumer may be part of several different food chains & several different organisms can serve as food sources in food webs.

  11. Sec. 30:3 # 11-15 (pg 643) • 13. Why are plants necessary to the path of energy through a community? • Plants are the beginning of most food chains & are necessary to the path of energy through a community b/c they are autotrophs (producers) and use the sun’s energy to make their own food (which heterotrophs/consumers can’t do). • 14. What would happen to the food chains in an area if all plants were to die? • Eventually the food chains would stop & everything would die.

  12. Sec. 30:3 # 11-15 (pg 643) • 15. What happens to most of the energy at each level of the food chain? • The amount of energy available at each level becomes less and less (as shown in the energy pyramid & by the 10% rule of Ecological Efficiency) b/c some of the energy is used by the previous organism for life processes (& some is lost as heat).

  13. Unit 1--Ch. 30 Review # 22 & 23 (pg651) • 22. What role does the sun play in a community? • The sun is used as an energy source by producers (autotrophs) to make food (by photosynthesis). • 23. What are two examples of decomposers? • Bacteria • Fungi (ex. mushrooms, mold)

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