Review Photosynthesis

The organelle pictured is called a​ (a)  

• chloroplast
• mitochondria
• nucleus
• ribosome

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NGSS.MS-LS1-2

The biological process by which plants and certain other organisms use sunlight to convert carbon dioxide and water into glucose (sugar) and oxygen explains how energy is transferred -

• during photosynthesis

• during cellular respiration

• in a food web

• through the nitrogen cycle

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During photosynthesis​ (a)   from the sun is converted into ​ (b)   that can be conserved and transported in plants.

• light energy
• chemical energy
• carbon dioxide gas
• water molecules
• oxygen gas

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What is needed for photosynthesis -

[Check all that apply]

• carbon dioxide (CO₂)

• water (H₂O)

• Light energy

• chlorophyll pigment

• oxygen (O₂)

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The products of photosynthesis are -

[Check all that apply]

• carbon dioxide (CO₂)

• water (H₂O)

• Light energy

• glucose (C₆H₁₂O₆)

• oxygen (O₂)

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Which of the following best represents the chemical equation for photosynthesis?

• 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

• C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O

• 6CO₂ + 6O₂ → C₆H₁₂O₆ + 6H₂O

• C₆H₁₂O₆ + 6H₂O → 6CO₂ + 6O₂

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Which of the following is NOT a known factor that affects the rate of photosynthesis?

• Light intensity (brightness)

• Wavelengths of light (colors)

• Temperature

• Availability of carbon dioxide and water

• Humidity

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NGSS.MS-LS1-6

Light color significantly affects photosynthesis, as different wavelengths of light (colors) are absorbed differently by chlorophyll in plants.

Which colors are the most effective for photosynthesis?

[Check all that apply]

• red

• blue

• green

• yellow

Answer explanation

Red and blue light generally are the most effective for photosynthesis, while green light is least absorbed and therefore less efficient for the process.

Green is reflected, which gives leaves their green appearance.

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NGSS.MS-LS1-6

Photosynthesis takes place in the ​ (a)   of cells. These organelles are primarily found in the ​ (b)   of plants. Openings called ​ (c)   allow gasses (CO₂ & O₂) into and out of the leaves, and can be found on the underside of the leaf. The green pigment chlorophyll is contained in sac-like membranes called ​ (d)   . These stack up to form granum. ​ (e)   is the liquid space inside the chloroplast.

• chloroplasts
• leaves
• stomata
• thylakoids
• Stroma

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What is the role of chlorophyll in photosynthesis?

• To absorb water from the soil

• To capture and transfer light energy

• To produce oxygen

• To convert carbon dioxide into glucose

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