Which of the following is a biotic factor in an ecosystem?

• Water

• Sunlight

• Plants

• Rocks

Answer explanation

Plants are biotic factors as they are living organisms that interact with other living and non-living components in an ecosystem. In contrast, water, sunlight, and rocks are abiotic factors.

What is the role of sunlight in an ecosystem?

• It provides food for animals.

• It is a source of energy for plants.

• It is a habitat for fish.

• It is a type of soil.

Answer explanation

Sunlight is crucial in an ecosystem as it serves as a source of energy for plants, enabling photosynthesis. This process allows plants to produce food, which supports the entire food web, making it essential for all life forms.

How do plants interact with abiotic factors in an ecosystem?

• They eat other plants.

• They use sunlight and water to make food.

• They hunt for prey.

• They decompose dead organisms.

Answer explanation

Plants interact with abiotic factors by using sunlight and water to perform photosynthesis, which allows them to create their own food. This process is essential for their growth and survival in an ecosystem.

Which of the following is an example of an abiotic factor affecting a biotic factor?

• A rabbit eating grass.

• A tree providing shade for a plant.

• Temperature affecting the growth of a plant.

• A bird building a nest in a tree.

Answer explanation

Temperature is an abiotic factor that influences the growth of plants, which are biotic factors. This relationship shows how non-living elements affect living organisms, making it the correct choice.

Why is water considered an abiotic factor in an ecosystem?

• It is a living organism.

• It is necessary for photosynthesis.

• It is a source of food.

• It is a type of animal.

Answer explanation

Water is considered an abiotic factor because it is a non-living component of the ecosystem. It is essential for photosynthesis, which is a process carried out by living organisms to produce energy.

Describe how animals might adapt to changes in abiotic factors like temperature.

• They change their diet.

• They migrate to warmer or cooler areas.

• They become extinct.

• They stop reproducing.

Answer explanation

Animals adapt to temperature changes primarily by migrating to areas with more suitable climates, allowing them to survive and thrive. Other options like changing diet or stopping reproduction are less effective in response to abiotic changes.

What might happen to a plant if it does not get enough sunlight?

• It will grow faster.

• It will produce more flowers.

• It will not be able to perform photosynthesis effectively.

• It will become a different species.

Answer explanation

Without enough sunlight, a plant cannot perform photosynthesis effectively, which is essential for its growth and energy production. This leads to stunted growth and poor health.

Explain how a predator-prey relationship is an example of biotic interaction.

• It involves non-living things.

• It involves one organism eating another.

• It involves plants growing.

• It involves water and sunlight.

Answer explanation

A predator-prey relationship is a clear example of biotic interaction because it involves one organism (the predator) eating another (the prey), showcasing the dynamic interactions between living organisms.

How do decomposers contribute to the ecosystem?

• They produce food for plants.

• They break down dead organisms and recycle nutrients.

• They provide shelter for animals.

• They compete with plants for sunlight.

Answer explanation

Decomposers play a crucial role in ecosystems by breaking down dead organisms, which recycles nutrients back into the soil. This process enriches the environment, allowing plants to thrive and supporting the entire food web.

Predict what might happen to an ecosystem if a key abiotic factor, like water, is removed.

• The ecosystem will thrive.

• The ecosystem will remain unchanged.

• Many organisms will struggle to survive.

• New species will immediately appear.

Answer explanation

Removing a key abiotic factor like water disrupts the ecosystem, leading to a lack of resources. Many organisms depend on water for survival, so they will struggle to adapt or find alternatives, resulting in decreased populations.