Hmh Science Unit 11 Organisms and Their Environment

In an ecosystem, organisms interact with biotic and abiotic elements. Which BEST describes the BIOTIC part of the ecosystem

• plants that grow in soil

• the animals that breathe oxygen

• all living things in the environment

• plants and animals that live in water

If you stand in the middle of an open field, you are standing among individual organisms, different species, populations and communities. What makes up one of the populations in the field?

• all organisms of the same species

• the different communities in the ecosystem

• the communities that occupy the same niche

• all organisms that live in a certain part of the field

The rain forests in South AMerica support many ecosystems. These ecosystems are healthy. How does the diversity in the rainforests help determine the health of ecosystems?

• When diversity is high, there are more resources available

• Resources in the environment last longer when diversity is low

• Less diverse ecosystems have less competition among the residents.

• Ares with high diversity have increased competition among the residents.

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Temperature, water, soil, and air are non-living elements in an environment. Pictured is a toucan, a bird that lives only in warm, wet rainforests. What does this show about the role non-living elements play in an ecosystem?

• They control the changes of the seasons

• They prevent competition among populations to live and survive

• They determine which organisms can live and survive in the ecosystem.

• They help control the effect humans have on the ability of organisms to survive in the ecosystems.

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When scientists talk about an ecosystem and the type and number of animals and plants that live and survive in one, they are also concerned about limiting factors. What are limiting factors?

• the rate at which the plants and animals reach maturity

• the ratio of animals that lay eggs to those that give birth to live young

• the things necessary to support a population of organisms

• the difference between trees that lose leaves and those that don't

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Some organisms live and survive in their ecosystem by breaking down dead things for food. Which word describes these organisms?

• consumers

• decomposers

• herbivores

• producers

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How are decomposers like consumers?

• The provide energy to producers

• They must capture prey in order to survive

• They can make their own energy from sunlight

• They get their energy from producers or other consumers

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A rabbit eats grass to live and survive in its ecosystem. In the same ecosystem, bobcats eat rabbits. How are these living elements interacting?

• Rabbits are predators and bobcats are prey

• Rabbits are prey and bobcats are predators

• Rabbits are producers and bobcats are consumers

• Rabbits are consumers and bobcats are producers

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In the carbon dioxide-oxygen cycle, which organisms take in carbon dioxide and release oxygen as part of the process of making food?

• plants

• animals

• consumers

• plants and animals

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What is the significance of the carbon dioxide-oxygen cycle on the survival of plants?

• It requires full sunlight to create oxygen

• It takes in oxygen that animals release

• It takes in oxygen and releases carbon dioxide

• It takes in carbon dioxide and releases oxygen when producing sugars

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