TEKS Grade 7 Science - 7.10.B Biodiversity
Quiz by Texas Education Agency
Grade 7
Science (2017)
Texas Essential Knowledge and Skills (TEKS)
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4 questions
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- Q1Tropical rain forests have the greatest biodiversity of any type of land ecosystem. How does biodiversity contribute to the sustainability of an ecosystem?The presence of a variety of herbivore species that can feed on a large number of different producer species helps ensure abundant prey for predators in the ecosystem.All of the aboveThe presence of more species with different adaptations makes it more likely that some organisms will survive an ecological disaster.Greater genetic variation within species makes it more likely that some individuals will survive a disease outbreak.60s7.10b
- Q2Students in a science class visited four local ecosystems. The students observed the species present in each ecosystem and recorded their observations in the table. Based on these observations, which ecosystem is likely to be the least sustainable?Ecosystem 3, because it has few predatorsEcosystem 4, because it supports many animalsEcosystem 1, because it has the fewest speciesEcosystem 2, because it includes both aquatic and terrestrial species60s7.10b
- Q3The food webs below model relationships among the organisms in two ecosystems. Which ecosystem would be more likely to survive if a disease killed the grasses?The forest ecosystem, because most of the animals can eat other organismsThe forest ecosystem, because it has three top predatorsThe grassland ecosystem, because it has many herbivoresThe grassland ecosystem, because several predators compete for food60s7.10b
- Q4An ecosystem that is not sustainable can break down when a natural disaster occurs. This can lead to organisms in the ecosystem either leaving the area or dying off. Increased biodiversity results in a more sustainable ecosystem because —the transition area between two ecosystems is narrowerthere are fewer species to be affected by environmental stressesa greater number of plant species means that there is less barren landa greater variety of species present allows more organisms to adapt after changes occur60s7.10b
