ES Unit 1 QC #1 - Levels of Organization and Succession

What is biomass?

• The total mass of organisms in a given area or volume

• The variety of life in the world or in a particular habitat

• The gradual process by which ecosystems change and develop over time

• The introduction of new species to an ecosystem

What does biodiversity refer to?

• The total mass of organisms in a given area or volume

• The variety of life in the world or in a particular habitat

• The gradual process by which ecosystems change and develop over time

• The introduction of new species to an ecosystem

Which of the following is usually found at the beginning of secondary succession?

• Bare rock

• Soil

• Mosses

• Sand

What happens to biomass as an ecosystem progresses from a pioneer community to a climax community?

• Biomass decreases

• Biomass remains the same

• Biomass increases

• Biomass fluctuates randomly

During secondary succession, what is the first step in the process?

• Shrubs begin to replace grasses

• Shade-intolerant trees begin growing

• Grasses are carried by wind, water, or animals

• Shade-tolerant trees begin growing

What is a climax community?

• A community that is constantly changing

• A stable state achieved through access to deep soil and sunlight

• A community dominated by pioneer species

• A community with low biodiversity

Which of the following factors affect the growth of plants in ecological succession?

• Amount of Sunlight

• Shape of Rocks

• Temperature of Water

• Speed of Wind

What is another factor, besides sunlight, that affects plant growth in ecological succession?

• Amount of Rainfall

• Depth of Soil

• Type of Animals

• Color of Leaves

How does soil form?

• Soil forms from the erosion of metal.

• Soil forms from the breakdown of rocks and organic matter.

• Soil forms from the evaporation of water.

• Soil forms from the melting of ice.

How long does it typically take for soil to develop during primary succession?

• A few weeks

• A few months

• A few years

• Hundreds of years