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MCAS Practice Questions and Answers
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MCAS Practice Questions and Answers
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MCAS Practice Questions and Answerscommensalism - ANSWER-one organism benefits the other is unharmed
ex: sea anemones and clownfish
competition - ANSWER-when 2 organisms of the same species are fighting for the
same resources
ex: 2 zebras fighting for water
Decomposers - ANSWER-organisms that break down dead organisms and return the
nutrients to the soil
how does burning trees affect the nutrients cycle? - ANSWER-it releases carbon dioxide
faster
how does cutting down trees and leaving them on the forest floor affect the nutrients
cycle? - ANSWER-it will allow the decomposers ti break them down and receive energy
to transport in the food chain
How does the muscular system work with the respiratory system to make inhalation
possible? - ANSWER-The diaphragm muscle contracts to expand the chest and draw
air into the respiratory system
Identify functions of the skeletal system - ANSWER-1. Allows for movement of the body
2. Provide shape and structure for the body
3. Protects important, vital organs
4. Stores minerals (like calcium) for later use
5. Makes red blood cells (in the bone marrow)
if the decomposer population were to decrease what would happen to the population of
the producers and consumers - ANSWER-both the populations would decline because
not enough nutrients and energy is being transferred through the trophic levels
mutualism - ANSWER-both organisms benefit
ex: an rhino and a oxpecker
parasitism - ANSWER-One organism benefits and the other is harmed
ex: humans and mosquito
predator-prey relationship - ANSWER-when an organism eats another organism
ex: lion and zebra
primary consumer - ANSWER-an organism that eats producers (usually herbivores)
producer - ANSWER-an organism that produces its own food through photosynthesis
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