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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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NGSS.MS-LS1-6

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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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A group of similar cells working together is called...

• cell

• tissue

• organ

• organ system

• multicellular organism

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NGSS.MS-LS1-1

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Which number contains the nucleic acid?

• 1

• 2

• 3

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Match the following vocabulary terms and definitions:

• a group of tissue working together

• cell

• specialized cells working together

• organism

• the most basic form of life

• organ

• any living thing

• organ system

• a group of organs working together

• tissue

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NGSS.MS-LS1-3

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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NGSS.MS-LS1-5

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

• decomposers

• producers

• herbivores

• consumers

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NGSS.MS-LS2-3

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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NGSS.MS-LS1-6

NGSS.MS-LS2-3