Final Exam Ecology Review

Master ecology concepts! Review food webs, cycles, and population dynamics with this interactive worksheet.

A community can be shown in a food chain or a food web indicating the predator and prey relationships between the different organisms in an ecosystem. An energy pyramid shows how the energy is lost as you move up a food chain or food web. Match the term with its definition. Food Chain Shows how energy flows in an ecosystem Food Web Shows several connected food chains Energy Pyramid Shows the amount of food energy Ecosystem All living and nonliving things in one place Community All the populations in an ecosystem at the same time Identify the choices below as either a biotic factor or an abiotic factor. Don't forget Bio means life. An Abio means NOT alive. Biotic Factor Animals Bacteria Abiotic Factor Water Light Rocks Organisms in the environment can be classified by what they eat. Fill in the blanks to match the description to the definition. 1. A autotroph is an organism at the beginning of a food chain because they can produce their own food using energy from the sun.2. Organisms that hunt, kill, and eat other consumers are known as a carnivore.3. A consumer that eats only plants is known as a herbivore.4. A consumer that eats both plants and animals is called a(n) omnivore.5. Decomposers breakdown decaying organisms and nutrients are put back into the soil by bacteria and fungi. In a food chain the arrows show where the energy is being transferred. The bottom of a food chain or food web is always the producer... another name for autotroph. Consumers are the organisms that eat other plants or animals. Primary means first, secondary means second, and tertiary means third. Use this information and the image below to fill in the blanks below. - In this food chain, which organism is the producer? grass- In this food chain, which organism is the primary consumer? grasshopper- In this food chain, which organism is the secondary consumer? frog- In this food chain, which organism is the tertiary consumer? snake- If the frog population increased, what would happen to the grasshopper population? It would decrease. What is my Role? Use the picture of the food web to sort the following organisms.For each organism, decide what role it plays in the food web. Click on the organism and then select the correct category. Omnivore Humans Eats both plants and animals Carnivore Killer Whale Penguin Leopard Seal Meat eaters Herbivore Krill Cod Producer Phytoplankton Make their own food Review your cycle notes we learned about in class (carbon, water, nitrogen, phosphorus) and then complete the following. Water Cycle1. Water molecules typically enter the atmosphere as water vapor when they evaporate from the ocean or other bodies of water.2. Water can also enter the atmosphere by evaporating from the leaves of plants in the process of transpiration.3. Precipitation can also be absorbed into the soil, and is then called groundwater.Carbon Cycle4. Plants take in carbon dioxide during photosynthesis and use the carbon to build carbohydrates. Carbohydrates then pass through food webs to consumers.5. When organisms die, decomposers break down the bodies, releasing carbon to the environment.6. Carbon dioxide is released into the atmosphere by volcanic activity or by human activities.Nitrogen Cycle7. Nitrogen is found in soil, in the wastes produced by many organisms, and in dead and decaying organic matter.8. Bacteria convert nitrogen gas into ammonia, in a process known as nitrogen fixation.Phosphorous Cycle9. As rocks and sediments wear down, phosphate is released.10. Organic phosphate moves through the food web, from producers to consumers, and to the rest of the ecosystem. Population Growth - Use the image below to answer the questions In the absence of limiting factors a population can grow exponentially resulting in a(n) J Shaped CurveAfter reaching its limiting factors, like running out of food, space, water, or mates, the population growth stops rising exponentially and goes into a(n) S shaped curve.When the population reaches its maximum that the environment can support it has reached its carrying capacity