Science 6 ILEARN Practice #2

This is something introduced to an ecosystem. It can be positive (make more changes) or negative (make less changes)?

The purpose is to help restore an ecosystem to homeostasis (having all their needs met).

• Homeostasis

• Feedback mechanism

• Tomato

• Decomposer

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A musk thistle plant was moved into a new environment. The musk thistles grew very well in their new home. Other plants in the area began to die because the musk thistles were taking all the nutrients from the soil.

A scientist discovered the problem and decided to bring in weevils. Weevils eat musk thistles. The weevils ate the musk thistles and greatly reduced their numbers. Some of the plants native to the area began to grow again.

Which statement from the story describes a feedback mechanism that is keeping a population within certain limits?

• The musk thistles grew very well in their new home.

• A scientist discovered the problem and decided to bring in weevils.

• The weevils ate the musk thistles and greatly reduced their numbers.

• Some of the plants native to the area began to grow again.

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Why do plants conduct photosynthesis?

• To make light
• To make mitochondria
• To make glucose
• To release carbon dioxide

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Choose the correct words or phrases to fit into the blanks to complete the sentence.

Plants use the process of photosynthesis to make _____________ so that they can __________________________.

• Sugar, Make food for consumers

• Sugar, Grow and reproduce

• Solar energy, Dispose of waste

• Oxygen, Stay warm

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Invasive species alter the ecosystem when they___________in number quickly, this leads to __________ food for the native species.

• increase, less

• decline, more

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Many species of plants and animals live in the Florida Everglades.

The air potato plant was introduced to Florida in 1905. It spread rapidly through Florida. Air potatoes are vines that get sunlight by climbing trees.

What is a possible impact that air potato plants will have on the everglades?

• Populations of native birds will increase.

• Native plants will not get enough sunlight.

• Biodiversity within the everglades will increase.

• The air potato plant will not compete with native plants.

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Plants maintain homeostasis (get their needs met) by conducting POSITIVE phototropism. What is that?

• When a plant grows toward light.

• When a plant grows away from light.

• When a plant doesn't move at all.

• When a plant wilts.

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Biologists studied the effects of light on the growth of plant seedlings. Five seedlings were exposed to different conditions. The conditions are given in Table 1.

Which conclusion can be made about how light affected the seedlings?

Use the picture below to help.

• 
• The tip of the seedling responds to light to maintain homeostasis

• The base of the seedling responds to light to maintain homeostasis

• The seedling does not need to respond to light to maintain homeostasis.

• Both the tip and the base of the seedling respond to light to maintain homeostasis

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What are organisms that use other organisms (like producers) for food to gain energy?

• decomposers

• producers

• herbivores

• consumers

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Select TWO statements that describe the role of producers in the forest.

• Producers provide an energy source for consumers.

• Producers provide an energy source for decomposers.

• Producers use solar energy to conduct photosynthesis.

• Producers provide an energy source for other producers.

• Producers use organic matter to conduct photosynthesis.

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