Ecology SOL Unit 7.2 - Primary Productivity

What is productivity in the context of ecosystems?

• The rate at which energy is lost in the form of heat

• The rate at which energy is added to the bodies of organisms in the form of biomass

• The amount of energy stored in the soil

• The rate at which organisms decompose

Answer explanation

Productivity in ecosystems refers to the rate at which energy is added to organisms as biomass, indicating growth and energy capture through processes like photosynthesis.

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What is biomass?

• The amount of sunlight absorbed by plants

• The amount of matter stored in the bodies of a group of organisms

• The total weight of water in an ecosystem

• The number of organisms in a given area

Answer explanation

Biomass refers to the amount of matter stored in the bodies of a group of organisms. It encompasses all living and recently dead biological material, making it a key component in understanding energy flow in ecosystems.

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What are the TWO types of primary productivity?

• Gross

• Net

• Primary

• Secondary

Answer explanation

The two types of primary productivity are Gross and Net. Gross productivity refers to the total amount of energy produced by photosynthesis, while Net productivity is the energy available after accounting for respiration.

What does Gross Primary Productivity (GPP) refer to?

• The rate at which solar energy is captured in sugar molecules during photosynthesis

• The amount of energy stored in animal tissues

• The energy used by decomposers

Answer explanation

Gross Primary Productivity (GPP) measures the rate at which solar energy is converted into chemical energy in the form of sugar during photosynthesis, making it the correct choice.

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What is Net Primary Productivity (NPP)?

• Gross primary productivity divided by the rate of energy loss to metabolism and maintenance

• Gross primary productivity minus the rate of energy loss to metabolism and maintenance

• Gross primary productivity plus the rate of energy loss to metabolism and maintenance

• Gross primary productivity multiply by the rate of energy loss to metabolism and maintenance

Answer explanation

Net Primary Productivity (NPP) is calculated as Gross Primary Productivity (GPP) minus the energy lost to metabolism and maintenance. This reflects the energy available for growth and reproduction in an ecosystem.

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Which factor does NOT affect Net Primary Productivity?

• Solar energy input

• Temperature levels

• Moisture levels

• Color of the plants

Answer explanation

Color of the plants does not influence Net Primary Productivity, while solar energy, temperature, and moisture levels are critical factors that directly affect photosynthesis and plant growth.

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What is the significance of Net Primary Productivity in an ecosystem?

• It determines the amount of energy available to consumers.

• It measures the total biomass of decomposers.

• It indicates the rate of water absorption by plants.

• It shows the number of species in an ecosystem.

Answer explanation

Net Primary Productivity (NPP) is crucial as it represents the energy captured by photosynthetic organisms, which forms the basis of the food web. Thus, it determines the amount of energy available to consumers in the ecosystem.

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Which of the following is a factor affecting Net Primary Productivity?

• Wind Speed

• Nutrient Availability

• Soil Color

• Altitude

Answer explanation

Nutrient availability is crucial for plant growth and directly influences Net Primary Productivity, as it affects the rate of photosynthesis and biomass production. Other factors like wind speed, soil color, and altitude have less direct impact.

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What is the primary source of energy for Gross Primary Productivity?

• Wind

• Water

• Solar energy

• Geothermal energy

Answer explanation

The primary source of energy for Gross Primary Productivity is solar energy, as it drives photosynthesis in plants, enabling them to convert sunlight into chemical energy.

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What happens to some of the energy captured by producers?

• It is stored as heat.

• It is used for cellular respiration and growth.

• It is lost to the atmosphere.

• It is converted into water.

Answer explanation

Producers capture energy through photosynthesis, which is primarily used for cellular respiration and growth. This energy supports their metabolic processes and development, making it essential for their survival and reproduction.

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