The Living World: Ecosystems
Why is nitrogen important for plant growth?
It is a component of chlorophyll.
It is a key component of amino acids and nucleic acids.
It helps plants absorb water.
It protects plants from diseases.
Which of the following is a primary factor in determining the type of biome found in an area?
The number of species present
The political boundaries
Climate (temperature and precipitation)
Soil composition
A biome characterized by high temperatures and low precipitation is most likely a:
Tropical Rainforest
Temperate Deciduous Forest
Desert
Tundra
How might a prolonged drought impact the distribution of grasslands and desert biomes?
Grasslands might expand into desert areas.
Desert biomes might shift towards the equator.
Grassland biomes might transition into desert biomes.
Both biomes would remain unaffected.
Which of the following is a major reservoir of carbon?
The Sun
The Atmosphere
The Moon
Volcanoes
Which process removes carbon dioxide from the atmosphere?
Respiration
Combustion
Photosynthesis
Decomposition
Explain how deforestation impacts the carbon cycle and contributes to global warming.
Deforestation increases carbon sequestration, thus reducing global warming.
Deforestation has no impact on the carbon cycle or global warming.
Deforestation reduces carbon sequestration and releases stored carbon, increasing atmospheric carbon dioxide and contributing to global warming.
Deforestation only affects local weather patterns, not global climate.

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Which type of bacteria is responsible for converting atmospheric nitrogen into a usable form for plants?
Denitrifying bacteria
Nitrifying bacteria
Nitrogen-fixing bacteria
Decomposers
Why is phosphorus important for living organisms?
It is a component of carbohydrates.
It is a key component of DNA and cell membranes.
It helps regulate body temperature.
It is used for energy production.
Describe the process of eutrophication and explain how excessive use of nitrogen fertilizers contributes to it.
Eutrophication is a process that cleans water bodies, and nitrogen fertilizers help accelerate it.
Eutrophication is the depletion of nutrients in a water body due to fertilizer use.
Eutrophication is the enrichment of a water body with nutrients, leading to excessive algae growth and oxygen depletion, which can be caused by excessive nitrogen fertilizer runoff.
Eutrophication is a natural process that is not affected by human activities.