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CLS Ecosystems - Key Concepts

Authored by Kerry Pattison

Biology

9th Grade

Used 1+ times

CLS Ecosystems - Key Concepts
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50 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Explain how quadrats can be used to estimate the population size of an organism in two different areas.

Quadrats are placed randomly in each area, the number of organisms in each quadrat is counted, and the average is calculated. This average is then multiplied by the total area to estimate the population size in each area.

Quadrats are placed only in the area with the most organisms, and the total number found is used as the estimate for both areas.

Quadrats are used to trap organisms, and the number of trapped organisms is doubled to estimate the population size in each area.

Quadrats are placed in a line along the edge of each area, and only the organisms touching the quadrat edges are counted for the estimate.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Explain the transfer of substances and of energy along a food chain.

Energy and substances are transferred only through the air and not by eating.

Energy and substances are transferred from one organism to another when one organism eats another. Only a small percentage of energy is passed on at each trophic level; the rest is lost as heat, waste, or used for life processes.

All energy is passed on completely from one organism to the next without any loss.

Substances and energy are only transferred at the producer level and do not move up the food chain.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why is only about 10% of energy transferred from one trophic level to the next?

Because energy is only needed by producers, not by consumers.

Because energy is created at each trophic level and accumulates.

Because all organisms at each level store all the energy they consume.

Because most energy is lost as heat, waste, or used for life processes such as movement and respiration.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Define the following term: Animals that eat other plants or animals.

Producers

Consumers

Decomposers

Herbivores

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Define the following term: Organisms which decay dead material and help recycle nutrients.

Decomposers

Producers

Consumers

Predators

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Define the following term: A self-supporting system of organisms interacting with each other and with a physical environment.

Ecosystem

Habitat

Population

Community

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

All the non-living or non-biological components of an ecosystem i.e. physical factors such as soil, moisture, range of temperature, and availability of light.

Producers

Biotic factors

Abiotic factors

Consumers

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