7 th Grade Science Organisms Adaptations and their Ecosystems

Transcription

1 7 th Grade Science Organisms Adaptations and their Ecosystems

2 #1 A unit consisting of all the living and nonliving things in a given area that interact with one another. A: biosphere B: ecosystem C: community D: population

3 B. ecosystem

4 #2 Living things in an ecosystem. A: abiotic B: ecology C: ecosystem D: biotic

5 D. Biotic

6 #3 Non-living things in an ecosystem. A: abiotic B: biotic C: ecology D: ecosystem

7 A. Abiotic

8 #4 *Volcanic eruptions breaking the surface of the ocean. *Lichens move in on an area of bare rock. These are examples of. A: Primary succession B: Secondary succession C: Both D: Neither

9 A. Primary succession

10 #5 *Farmer plows a field and leaves it unattended. *Hurricane destroys a Coastline. *Forest re-grows after a forest fire. These are examples of. A: Primary succession B: Secondary succession C: Both D: Neither

11 B. Secondary succession

12 #6 Lichens grow on bare rock. Lichens break down the rock with a mild acid. A thin layer of soil is formed. This process is an example of. A. Primary succession B. Secondary succession Grasses begin to grow on the soil. A forest is formed. Trees with deeper roots grow in the deeper layer of soil. Small shrubs begin to grow. Decaying organic matter forms a thicker layer of soil.

13 A. Primary succession

14 #7 What is the major difference between primary and secondary succession? Primary begins on bare rock. A: B: Secondary begins when soil is already present. Secondary begins on bare rock. Primary begins when soil is already present. C: Both D: Neither

15 A. Primary begins on bare rock. Secondary begins when soil is already present.

16 #8 How would secondary succession affect an area that was destroyed by a hurricane? The area would regrow A: starting with B: lichen The area would re-grow starting with grassestrees-forest C: The area would never D: re-grow None of these

17 B. The area would regrow starting with grasses-trees-forest

18 #9 An ecosystem that is in balance. A: Primary community B: Succession community C: Climax community D: None of these

19 C. Climax Community

20 #10 How might a cloud of ash from a volcanic eruption that blocks out the sun effect ecosystems? A: Increase temperatures B: Lower temperatures C: Slow the rate of plant D: growth B and C

21 B. Lower temperatures C. Slow the rate of plant growth

22 #11 *Ecological succession helps to maintain equilibrium in an ecosystem. How would secondary succession help to restore equilibrium after a flood? A: It increases the number B: It prevents other species of types of species from arriving. C: It slows the rate of D: plant growth B and C

23 A. It increases the number of types of species

24 #12 This graph represents the changes in the number of species over time as an ecosystem in secondary succession becomes a. A: Climax Community B: Secondary community C: Climax adaptation D: None of these

25 A. Climax Community

26 #13 The diagrams above show an ecosystem during different stages of ecological succession. In which order will these stages occur, earliest to latest? A: 3,1,4,2 B: 4,2,1,3 C: 2,3,1,4 D: None of these

27 B. 4,2,1,3

28 #14 According to this graph, what effect does the increase in human population most likely have on the biodiversity of the plant species found in the rain forest? As human population A: increases, the diversity of rainforest plant species B: decreases. As human population increases, the diversity of rainforest plant species increases. C: Both D: Neither

29 A. As human population increases, the diversity of rainforest plant species decreases

30 #15 Which of the following organisms is considered a pioneer species in an ecological succession? A: Oak tree B: Rose bush C: Lichen D: None of these

31 C. Lichen

32 #16 You would find the most biodiversity in a meadow with a pond compared to a just a meadow. Why? The meadow and pond The Meadow and pond have A: have different B:: only one ecosystem with ecosystems and fewer overlapping overlapping ecosystems ecosystems C: Both D: None of these

33 A. The meadow and pond have different ecosystems and overlapping ecosystems

34 #17 A field consists of one species of plant. What can you infer about sustainability of the field ecosystem? Abiotic factors will not A: affect the sustainability of an ecosystem. B: It has low biodiversity and could be easily wiped out by disease. C: Both D: Neither

35 B. It has low biodiversity and could be easily wiped out by disease.

36 #18 In order for an ecosystem with high biodiversity to recover, what would organisms need to do if one food source became unavailable? Ex: In the left picture, the snakes begin to die from a disease. A: Move to a different B: Eat different food sources ecosystem C: They would die D: None

37 B. Eat different food sources

38 Great Job!!!! Thank you for playing!