Science - Photosynthesis and The Carbon Cycle Grade 9, Biology

What is the main reason that plants need magnesium?

• To make more cells

• To make chlorophyll

• To make flowers

• To absorb carbon dioxide

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NGSS.MS-LS1-6

Why do plants require nitrogen (in nitrate)? (There are two correct answers)

• To make more cells

• To convert carbohydrates to proteins

• To absorb water

• To make a strong stem

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NGSS.MS-LS1-5

NGSS.MS-LS2-1

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Which one is an example of a hypothesis for magnesium affecting plant growth.

• Magnesium will cause plants to grow taller regardless of the amount given.

• Plants with magnesium will have flowers that are brighter in color.

• Magnesium will reduce the amount of water plants need to grow.

• The more magnesium a plant is given, the more new leaves it produces.

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NGSS.MS-LS1-5

NGSS.MS-LS2-1

What is one possible effect of magnesium on plant growth?

• Plants with magnesium will have stronger roots.

• Magnesium will cause plants to produce more fruit.

• Magnesium deficiency will lead to yellowing of plant leaves.

• The more magnesium a plant is given, the faster it will grow.

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NGSS.MS-LS1-5

NGSS.MS-LS2-1

Which of the following hypotheses is suitable for the effect of nitrogen on plant growth?

• Nitrogen will decrease the soil's pH level, making it more acidic.

• The more nitrogen a plant is given (but not too much), the greater the plant size.

• More nitrogen will reduce the plant’s need for water.

• Plants will have more flowers when given more nitrogen.

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NGSS.MS-LS1-5

NGSS.MS-LS2-1

Here are the results of an experiment on the effect of nitrogen on plant growth:

• 0.5 mg of nitrogen: 2 new leaves
• 1.0 mg of nitrogen: 4 new leaves
• 1.5 mg of nitrogen: 7 new leaves
• 2.0 mg of nitrogen: 6 new leaves
• 2.5 mg of nitrogen: 3 new leaves

Which table is correct?

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NGSS.MS-LS1-5

NGSS.MS-LS2-1

Explain the difference between chloroplasts and chlorophyll.

• Chloroplasts help plants breathe, and chlorophyll helps them eat.

• Chloroplasts are in animal cells, and chlorophyll helps plants grow by splitting cells.

• Chloroplasts are part of a plant cell where photosynthesis takes place.

  Chlorophyll is a green pigment / substance that absorbs light energy for photosynthesis.

• Chlorophyll is a tiny part inside the cell’s center, and chloroplasts are the green stuff that catches sunlight.

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NGSS.MS-LS1-6

Based on the information in this table, what is a suitable amount of nitrogen for desirable plant growth?

• 0.2-0.8mg

• 0.6-1.2mg

• 1.3-2.2mg

• 2.1-3.5mg

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NGSS.MS-LS1-5

NGSS.MS-LS2-1

What are the products of photosynthesis?

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NGSS.MS-LS1-6

What are the reactants of photosynthesis?

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