Biology
Sixth Six Weeks Student Expectations (TEKS)
Unit 16 (12A, 12C, 12E, 12F) Test date: _________________ Grade: ______________
12A Interpret relationships including predation, parasitism, commensalism, mutualism, and competition among
organisms.
 Niche, habitat, symbiotic relationship, competition, predation, parasitism, commensalism, mutualism
1. What is an organism’s role in its environment? Give an example.
2. What types of relationship to organisms engage in? Be able to give an example for each type of symbiotic
relationship.
12C Analyze the flow of matter and energy through trophic levels using various models including food chains, food
webs, and ecological pyramids.
 Trophic level, producer, consumer, autotroph, heterotroph, decomposer, scavenger, food chain, food web,
ecological pyramid, energy pyramid
1. Be able to list all the organisms role in a food web.
2. How does energy flow through levels in an ecological pyramid?
3. Be able to give examples for each vocabulary word in a food chain/food web.
12E Describe the flow of matter through the carbon and nitrogen cycles and explain the consequences of disrupting
these cycles.
 Nitrogen fixation, denitrifying bacteria, eutrophication, acid precipitation, fossil fuels
1. Explain how matter flows through the carbon cycle.
2. Describe various geological processes important for both carbon and nitrogen cycles.
3. What are some consequences of disruptions to the carbon cycle?
4. Explain how matter flows through the nitrogen cycle.
5. What are some consequences of disruptions to the nitrogen cycle?
6. What are causes of disruption of both cycles?
12F Describe how environmental change can impact ecosystem stability.
 Ecosystem stability, biodiversity, habitat fragmentation, invasive species
1. How are ecosystem stability and biodiversity related?
2. How can environmental change impact the stability of an ecosystem?
3. What is habitat loss?
4. How can human activities cause environmental change and impact the stability of ecosystems?
5. List some examples of invasive species.
6. Explain global climate change.
7. What are some causes of global climate change?
Unit 17 (11D, 12B, 12D)
Test Date: ______________ Grade: ____________
11D Describe how events and processes that occur during ecological succession can change populations and species
diversity.
 Ecological succession, primary succession, secondary succession, pioneer species, climax community,
1. What is ecological succession?
2. Explain and give an example of primary succession.
3. Explain and give an example of secondary succession.
4. How does ecological succession change populations?
5. How does ecological succession change species diversity?
6. How do populations change as succession progresses?
7. How does species diversity change as succession progresses?
12B Compare variations and adaptations of organisms in different ecosystems.
 Genetic variation, adaptation, camouflage, biome, ecosystem, deciduous forest, desert, coral reef, rainforest,
savannah
1. How does genetic variation help an organism survive? Give an example.
2. Be able to describe each type of ecosystem and biome.
3. Explain the adaptations of certain organisms that help it survive in that particular ecosystem or biome.
4. Give examples of specific organisms that live in each biome.
12D Recognize that long-term survival of species is dependent on changing recourse bases that are limited.
 Recourse, extinct, mass extinction, endangered species, limiting factors
1. What resources do all organisms compete for?
2. What are the factors affecting population size?
3. What can change the resource bases for an environment?
4. Give some examples of endangered species.
5. Describe an example of mass extinction.