LIFE SCIENCE

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LIFE SCIENCE

• REVIEW

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• Cell ? Tissue ? Organ ? System

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THE CELL
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• Cell Wall outer wall of plant cells, provides
  support

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• Cell Membrane outer boundary of plant/animal
  cell, semi-permeable membrane

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• Nucleus the cells control center, controls all
  chemical reactions and genetic material

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• Cytoplasm clear, jelly-like matter outside
  nucleus, contains organelles

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• Vacuole fluid filled sac in cytoplasm, stores
  food, water, enzymes

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• Chloroplasts contain chlorophyll in plant
  cells, absorbs energy from sunlight,
  photosynthesis

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Photosynthesis
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• Mitosis most cells, mother cell divides into
  two identical daughter cells, each with the same
  number of chromosomes as the mother cell

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

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FOOD CHAINS
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• Producers organisms that make their own food
  (plants)

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• Consumers organisms
• that feed on
• others

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• Decomposers organisms that feed on dead matter
  (molds, mushrooms, bacteria)

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• Parasites live on a host and cause it harm

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Food Chain
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Food Web
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BIOMES
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Tropical Rainforest
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Temperate Rainforest
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Tundra
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Taiga
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Grasslands
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• Savanna

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Desert
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Desert
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• Answers to Life Systems Ecosystems Review
  Homework

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

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

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• 6. Mitosis is body cell reproduction
• 7. Meiosis is sex cell reproduction
• 8. Complete the following
• Cells ? tissue ? organs ? organ systems

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

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• 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

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• 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

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• 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

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• 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