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Essential Ecosystem Concepts: 7th Grade Exam Review

Prepare for your 7th-grade semester exam with our comprehensive review of essential ecosystem concepts. This guide covers key topics such as the recycling of matter in ecosystems, the differences between organic and inorganic compounds, the energy flow in food webs, and various ecological organizations. Understand the significance of temperature, light, and gravity on plant tropisms, learn about primary and secondary consumers, and explore the impact of volcanic activity on the environment. Get ready to ace your exam with clear explanations and examples.

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Essential Ecosystem Concepts: 7th Grade Exam Review

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  1. Quiet Ball Semester Exam Review 7th grade

  2. Why do ecosystems not need a constant supply of matter? • Because matter is constantly recycled

  3. How do organic compounds differ from inorganic compounds? • All organic compounds contain Carbon

  4. What is the land called that drains water into tributaries? • Watershed

  5. What is the source of energy in a food web? • The Sun

  6. What can cause erosion to occur? • Wind • Water • Ice

  7. What other catastrophic events could occur from a volcano? • Landslide • Earthquake • Wildfire

  8. When identifying an organism using a dichotomous key, how many choices should be with each step? • Two

  9. How is energy transferred during photosynthesis? • Radiant energy is transformed into chemical energy.

  10. What are examples of tropisms – things plants will respond to? • Gravitropism (Geotropism) – response to gravity • Phototropism – response to light • Thermotropism – response to temperature

  11. What does a secondary consumer eat? • Omnivore/Carnivore- eat animals • A primary consumer which eats only plants – A herbivore

  12. What is the order of ecological organization beginning with organism? • Organism, population, community, ecosystem, biosphere

  13. What is the pioneer species in primary succession? • Lichens

  14. What belongs in the energy pyramid? • A = producers • B = primary consumers • C = secondary consumers • A = 100% autotrophs • B = 10% herbivores • C = 1% carnivores C B A

  15. In a food web, what do plants provide for the consumers? • Energy

  16. When an animal eats a plant, what happens to the sugar? • The chemical energy gets converted into others forms of energy

  17. What do Fungi and bacteria have in common? • They recycle dead organic material

  18. What is the smallest level of ecological organization? • Organism – an individual member of a species

  19. What color fur will allow a rabbit to survive in an Arctic climate and why? • White fur – so it can hide from predators

  20. How do most birds react to seasonal change? • They Migrate

  21. If dark moths have an advantage in hiding from predators what makes them most FIT? • Coloration • They have a better chance of surviving to produce dark-colored offspring and dark moths will become more abundant.

  22. What type of water will not affect oceans after a rain? • Groundwater – this water seeps into the ground and gets stored in aquifers.

  23. What is most likely to grow on bare rock after a volcanic eruption? • Lichens

  24. Having more species in an area will result in? • More links in food chains and more stability

  25. Having a variety of ecosystems would lead to? • More habitats for different species

  26. If organisms have two parents, what could you say about the offspring? • It is a mixture of two parents • ½ genes come from each parent • They exhibit traits from both parents • Leads to more diversity

  27. What adaptations would you find in a predator? • Sharp claws • Sharp pointed teeth • Small eyes

  28. If a brown rat and a white rat have only brown babies what are the most likely genotypes of the parents? • GG x gg

  29. What restricts the exploration of our solar system the most.? • The cost

  30. If GgxGg cross what percent is likely to be white? • 25 percent

  31. What is found within a chromosome and has information about particular hereditary traits? • Genes

  32. If a father has blonde hair and mother has brown, what are the possible hair color of the children? • Blonde or brown

  33. What characteristics allow life to live on Earth? • The presence of water • Proximity to the sun • Composition and existence of an atmosphere

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