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Life Science Chapt 4

Ecosystems and Biomes

QuestionAnswer
The function of a decomposer in an ecosystem is to... recycle materials so they can be used again.
An energy pyramid is used to show... how much energy is available at each level of the food chain.
The 4 most important materials in an ecosystem are... sunlight, water, carbon dioxide, and oxygen.
Nitrogen gas is returned to the atmosphere when bacteria... decomposes plant and animal wastes.
The most common types of plants in the tundra biome are... mosses and lichens
Within any ecosystem, populations of organisms change when... conditions change.
Define competition... two or more organisms attempting to use the same resource
Organisms that live in an estuary must adapt to... rapidly changing conditions.
The biome that covers the largest portion of the Earth's surface... saltwater
2 important factors that determine the types of organisms that live in each area of a lake... temperature and light
Shows how the different food chains in an ecosystem are interconnected... food webs
In a healthy ecosystem, the biotic and abiotic parts are... balanced
Grow in nodules on roots of some plants....and change nitrogen gas into nitrogen compounds that plants can use... Nitrogen-fixing bacteria
ENERGY is RELEASED in cells during the process of ... respiration
Dominant plants in the taiga biome coniferous trees
What is 80% ? the portion of the Earth's atmosphere that is nitrogen gas..actually it is 78%
Organisms that eat only meat... carnivores
If the sea level rises what will happen to coral polyps? The amount of light decreases and will kill the coral polyps.
The organism at the bottom of a food chain is always a ... producer
Increased levels of carbon dioxide may be connected to... global warming AKA climate change
The most important factor in determining the kinds of plants that dominate a biome is... climate
The soil in a tropical rain forest is thin and sandy because... plants quickly absorb the nutrients.
This biome does not have green plants... deep ocean.
Using less fossil fuel will... help protect the environment.
All living things need nitrogen to help them make this nutrient ... proteins.
Fewer trees grow in grassland biomes because... grassland biomes get less rain.
Some of these biomes are sandy and others are covered with rocks and boulders... desert biomes
Rivers and streams describe this biome... freshwater
Define estuary a water biome where fresh water from rivers and streams mixes with saltwater from the ocean.
A biome that provides a breeding area for many birds and ocean animals... estuary
Predict what will happen if people fill in an estuary and build houses there. Animals would have to adapt and find new places to breed, raise their young, and find food. Some would move to other places, but others may not survive.
In a healthy ecosystem these 2 parts are balanced... the biotic and abiotic parts
Created by: fernanm
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