1. Where do minerals and water enter a plant? a. Through the bark b. Through the roots c. Through the stem d. Through the leaves

2. b. Through the roots

3. How long could you live without water? a. A few minutes b. A few weeks c. A few days d. A few hours

4. c. A few days

5. What property of water makes it vital to living things? A. it maintains homeostasis b. it is made of lipids and proteins c. it makes an organism more complex d. It dissolves more chemicals than any other substance

7. A(n) _____ is a trait that helps an organism live in it environment a. response b. reproduce c. adaptation d. migrate

8. c. adaptation

9. All living things get energy either directly or indirectly from a. animals b. sun c. plants d. water

10. b. sun

11. The building up or breaking down of chemical substances necessary for life is called a. ingestion b. respiration c. excretion d. metabolism

13. Organisms receive signals that causes them to react. What are these signals known as? A. responses b. signals c. movements d. stimulus

15. The mistaken idea that living things come from nonliving sources is known as a. stimuli b. homeostasis c. heterotrophs d. spontaneous generation

17. Organsims use ________to keep conditions like body temperature at a constant rate in spite of the conditons outside a. stimulus b. responses c. homeostasis d. energy

18. c. homeostasis

19. The process of breaking down food so that it can be used by living things is a. ingestion b. digestion c. respiration d. transport

20. b. digestion

21. In order to live all plants and animals need a. darkness b. helium c.food d. nitrogen

22. c. food

23. Which of the following do all living things need to survive? A. carbon dioxide B. water C. oxygen D. sunlight

24. b. water

25. The experiments of Redi and Pasteur helped to demonstrate a.Organisms do not arise from nonliving sources b.Organisms respond to stimulus c.Organisms are made of cells d.Organisms develop over time

26. a. Organisms do not arise from nonliving sources

27. A plant growing towards the light is an example of a.A stimulus b.Reproduction c.A response d.development

28. a. stimulus

29. What is the most abundant chemical found in cells? a.Carbohydrates b.Nucleic acids c.Proteins d.water

31. Organisms that are made of only one cell are called a. unicellular b. multicellular c. autotrophs d. heterotrophs

32. a. unicellular