1. LIFE SCIENCE REVIEW

2. Cell → Tissue → Organ → System

3. THE CELL

4. Cell Wall – outer wall of plant cells, provides support

5. Cell Membrane – outer boundary of plant/animal cell, semi-permeable membrane

6. Nucleus – the cell’s control center, controls all chemical reactions and genetic material

7. Cytoplasm – clear, jelly-like matter outside nucleus, contains organelles

8. Vacuole – fluid filled sac in cytoplasm, stores food, water, enzymes

9. Chloroplasts – contain chlorophyll in plant cells, absorbs energy from sunlight, photosynthesis

10. Photosynthesis

13. Mitosis – most cells, mother cell divides into two identical daughter cells, each with the same number of chromosomes as the mother cell

14. Meiosis – division of cell, each daughter cell has half number of chromosomes as mother cell (sexual reproduction)

15. FOOD CHAINS

16. Producers – organisms that make their own food (plants)

17. Consumers – organisms that feed on others

18. Decomposers – organisms that feed on dead matter (molds, mushrooms, bacteria)

19. Parasites – live on a host and cause it harm

20. Food Chain

21. Food Web

22. BIOMES

23. Tropical Rainforest

24. Temperate Rainforest

25. Tundra

26. Taiga

27. Grasslands

28. Savanna

29. Desert

31. Answers to Life Systems & Ecosystems Review Homework

32. 1.The function of the cell membrane is to allow substances in/out of cell 2. The nucleus is the cell’s control center; it controls all chemical reactions and genetic material 3. Cytoplasm is a clear, jelly-like matter outside the nucleus; it contains organelles

33. 4. Chloroplasts contain chlorophyll in plant cells and absorb energy from sunlight (photosynthesis) 5. A cell wall provides outer wall support for plant cells

34. 6. Mitosis is body cell reproduction 7. Meiosis is sex cell reproduction 8. Complete the following: Cells → tissue → organs → organ systems

35. 9. Write the classification system from larger group characteristics to unique characteristics

36. 10. At the bottom of food pyramids are producers. A producer is a plant 11. Something that eats something else is a consumer 12. An organism that benefits while the host is killed or harmed is a parasite 13. An organism that breaks down dead matter is a decomposer

37. 14. & 15. have been omitted 16. In an ecosystem, the job a single organism perform in its community is a niche 17. In an ecosystem, all of the same species in a given area is a population

38. 18. at least 100 inches of rainfall annually rainforest 19. ground stays permanently frozen (permafrost), vegetation is low and hardy tundra 20. very little precipitation desert 21. high altitude, rocky, coniferous trees taiga 22. flat and with an abundant supply of food for hoofed animals grassland

39. 23. area with cone-bearing trees coniferous forest area with trees that lose leaves deciduous forest 24. grassland with scattered trees and drought-resistant plants savanna

40. 25. Nocturnal is when an animal is active during the night 26. Diurnal is when an animal is active during the day 27. Hibernation is reduced activity, usually during winter months