7th Grade Life Science Interim review (1st Semester)

Question Answer
What is the ultimate source of all energy on earth? The sun
What is matter? Anything that has mass and takes up space
Compare and contrast biotic and abiotic biotic is the living parts of the ecosystem and abiotic is the non-living
What are the nutrient cycles we studied? Water, carbon/oxygen, nitrogen, phosphorus
Complete the sequence of environmental organization from simple to most complex: individual, population, community, ecosystem/biomes, and biosphere
What are autotrophs? Producers that make their own energy, mostly from the sun
What is photosynthesis? The biochemical process that takes smaller inorganic molecules and creates large organic molecules for energy storage
What are heterotrophs? Organisms that must get their food by consuming other organisms
What are herbivores? Organisms that eat only plants
What are carnivores? Organisms that eat only other heterotrophs
What are omnivores? Organisms that eat both plants and animals
What are scavengers? Scavengers that eat dead matter
Why are decomposers important? They break down organic molecules, making nutrients re-available
What is a food chain and what does the arrow tell you? A sequence of who eats who; the arrow points towards higher order consumer
What is a food web and what are the levels of consumers? A complex combination of food chains showing multiple consumers; first level who are herbivores, secondary level are carnivores and omnivores, tertiary consumers who are tope carnivores; The further from the producer the higher the level of consumer
What is an energy pyramid? A diagram that shows the amount of energy in each level of the ecosystem
What is a niche? The role an organism plays in the ecosystem
What is the habitat? The place where the organism lives/works in the ecosystem
What are adaptations? Gradual changes that organisms have made to survive in their ecosystem
What is predation? What do we call the two organisms? the predator consumes the prey
What are the three types of symbiotic relationships? Define each Mutualism where both benefit,
commensalism where one benefits and the other is not harmed,
parasitic where the parasite harms the host (but doesn’t kill it)

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