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Environmental Science DSST Questions And Correct Answers Latest Version 2024
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Environmental Science DSST Questions And Correct Answers Latest Version 2024
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Environmental Science DSST QuestionsAnd Correct Answers Latest Version 2024
Protists Answer: a diverse group of one celled organisms and their many-celled relatives
Plants Answer: Many-celled organisms that have cell walls and that make their own food using the
sun's energy
Gymnosperms Answer: woody plants that produce seeds, but their seeds are not enclosed in fruits
Angiosperms Answer: flowering plants that produce seeds in fruit
Invertebrates Answer: animals that lack backbones
vertebrates Answer: animals with backbones
The 8 kingdoms of organisms Answer: Archaebactera
Eubacteria
Fungus
Protist
Gymnosperm
Angiosperm
Invertebrate
Vertebrate
,Benefits of Bacteria and Fungi Answer: Bacteria breaks down the remains and wastes other
organisms and returns nutrients to the soil.
Bacteria recyles mineral nutrients
Bacteria contains nutrients for food.
Fungi adds flavor to food
Fungi (yeast) adds gas to food to make it rise
Fungi breaks down matter and absorbs nutrients
Fungi breaks down body parts and the bodies of dead organisms
Benefits of Protists to the Ocean Answer: Algae is the intial sources of food in most ocean and
freshwater ecosystems.
Why Insects are so successful Answer: Insects have a waterproof external skeleton. They move
quickly and reproduce quickly. They can fly and are small enough to hide.
Photosynthesis Answer: energy from the sun which enters and ecosystem when a plant uses
sunlight to make sugar molecules (carbohydrates)
Producers Answer: an organism that makes its own food; aka autotrophs; the only things that can
survive without other organisms
consumers Answer: organisms that get their energy by eating other organisms; examples - bears,
humans, mice, starfish, insects ; aka heterotrophs
decomposers Answer: consumers who get their food by breaking down dead organisms
herbivore eat producers or consumers Answer: producers
,carnivores eat producers or consumers Answer: other consumers
omnivores eat producers or consumers Answer: both producers and consumers
cellular respiration Answer: the process of breaking down food to yield energy
Food chain Answer: a sequence in which energy is transferred from one organism to the next
through eatting
Food web Answer: shows many feeding relationship that are possible in an ecosystem. It's more
complex than a food chain because it includes multiple food chains and more organisms.
Trophic level Answer: each step through which energy is transferred in a food chain
Energy Pyramid Answer: a representation of the trophic levels - biggest group (producers) on the
bottom and gradually smaller as the amount of consumers decreases
definition of carbon cycle Answer: a process by which carbon (an essential component of proteins,
fats, and carbohydrates) is cycled between the atmosphere, land, water, and organisms
nitrogen-fixing bacteria Answer: the only organisms that can fix atmospheric nitrogen in chemical
compounds these few species of bacteria
nitrogen cycle Answer: a process in which nitrogen is cycled between the atmosphere, bacteria and
other organisms
phosphorus cycle Answer: the movement of phosphorus (helps make up the cells o living
organisms) from the environment to organisms and then back to the environment. slowest of of all
cycles and does not normally include the atmosphere b/c phosphorus rarely occurs as a gas.
, carbon short-term cycle Answer: 1. producers convert carbon dioxide in the atmosphere into
carbohydrates during photosynthesis
2. consumers eat producers and gains the carbon from the producer
3. carbon is then released into the air through cellular respiration
carbon long-term cycle Answer: 1. carbon may be converted into carbonates - make up the up parts
of bones and shells
2. carbonate deposits may form limestone (one of the biggest carbon sink or carbon reservoirs)
3. carbohydrates also may form fossil fuels - carbon compounds from the bodies of anmials after they
have died
carbon effects Answer: global warming
carbon in the water - which makes water another carbon sink
effects on fertilizers on the nitrogen and phosphorus cycles Answer: It can cause excess algae in the
aquatic ecosystem - called an algal bloom - which can deplete an aquatic ecosystem of important
nutrients such as oxygen which fish and other aquatic organisms need to survive.
Effects of burning fossil fuels Answer: too much carbon is released into the air
what's the slowest of the 3 "cycles" Answer: phosphorus cycle - b/c it does not normally include the
atmosphere because phosphorus rarely occurs as a gas
Ecological succession Answer: the gradual process of change and replacement of some of all of the
species in the community.
Primary succession Answer: the type of succession that occurs on a surface where not ecosystem
existed before
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