Biotic and Abiotic Factors in Ecosystems (TEKS 6.12.A) Quiz

Which of these is an example of a biotic factor that could limit the population of a community in an ecosystem?

• A drought occurs for several months.

• New predators move into the ecosystem.

• A hailstorm passes through the ecosystem.

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Which of the following situations describe organisms competing for biotic factors in an ecosystem? Circle TWO correct answers.

• Caterpillars and giraffes eat leaves from the same tree.

• Vultures feed on a dead antelope killed and abandoned by lions.

• Dragonflies and trout feed on mosquitoes above the surface of a lake.

• A group of rabbits run across a grassland to escape a pack of wolves.

• Two trees send their branches higher and higher to absorb more sunlight.

The graph shows the population of a group of rabbits in a restricted area studied over a period of five years. Which statement might explain why the population leveled off, as shown in the graph?

• The rabbits encountered a new disease.

• Predators were introduced into the area.

• Competition for resources limited the rabbit population.

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Which statement describes a situation in which abiotic factors would limit the growth of a population?

• Predators are removed from the area.

• Animals spread a new disease through a population.

• Water and mineral resources are depleted in an area.

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What is one way that populations within a community compete with each other?

• fighting over territory

• sharing resources such as food and water

• several animals working together to raise the young

A few years after a farmer stopped using pesticide on their crops, the number of wildflowers in the land bordering the fields began to increase. Complete the explanation of why the number of wildflowers increased. Write the letter of ONE correct answer on each line.

The absence of pesticides in the fields caused the bee population to 1. ____________.

• fewer

• decrease

• more

• increase

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A few years after a farmer stopped using pesticide on their crops, the number of wildflowers in the land bordering the fields began to increase. Complete the explanation of why the number of wildflowers increased. Write the letter of ONE correct answer on each line.

The absence of pesticides in the fields caused the bee population to 1. INCREASE.

As a result, there were 2. ____________ bees to spread pollen among the wildflowers.

• more

• fewer

• increase

• decrease

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A few years after a farmer stopped using pesticide on their crops, the number of wildflowers in the land bordering the fields began to increase. Complete the explanation of why the number of wildflowers increased. Write the letter of ONE correct answer on each line.

The absence of pesticides in the fields caused the bee population to 1. INCREASE. As a result, there were 2. MORE bees to spread pollen among the wildflowers. This caused the flowers to produce 3. ____________ seed.

• decrease

• increase

• more

• fewer

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Plants depend on biotic and abiotic factors to survive, grow, and reproduce. Classify the factors as biotic or abiotic.

"Sunlight provides energy."

• Biotic

• Abiotic

Plants depend on biotic and abiotic factors to survive, grow, and reproduce. Classify the factors as biotic or abiotic.

"Wind carries seeds away."

• Biotic

• Abiotic