Photosynthesis, Respiration and Macromolecules Quiz

During a biology class, Anika and William were discussing the primary pigment involved in photosynthesis. What is the primary pigment involved in photosynthesis?

• Chlorophyll

• Carotene

• Xanthophyll

• Anthocyanin

Answer explanation

Chlorophyll is the primary pigment involved in photosynthesis, responsible for capturing light energy and converting it into chemical energy.

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DOK Level 1: Recall

During a biology class, Emma asked, 'Which organelle is responsible for photosynthesis in plant cells?'

• Mitochondria

• Chloroplast

• Nucleus

• Ribosome

Answer explanation

The organelle responsible for photosynthesis in plant cells is the Chloroplast.

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DOK Level 1: Recall

During a biology class, Samuel explained that the two main stages of photosynthesis are (a)   and Calvin Cycle (Light-independent reactions)

• Glycolysis
• Light-dependent reactions
• Electron Transport Chain
• Fermentation

Answer explanation

The two main stages of photosynthesis are Light-dependent reactions and Calvin Cycle (Light-independent reactions).

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DOK Level 1: Recall

During a science experiment, Sophia and Elijah observed a plant. Which gas did they find to be a by-product of photosynthesis?

• Oxygen

• Carbon Dioxide

• Nitrogen

• Methane

Answer explanation

Oxygen is the byproduct of photosynthesis, produced when plants convert carbon dioxide into glucose during the process.

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DOK Level 1: Recall

Match the following processes with their purposes in photosynthesis.

• Carbon fixation

• To produce glucose

• Light-dependent reactions

• To generate ATP and NADPH

• Calvin Cycle

• To fix carbon dioxide

• Photolysis

• To break down water

Answer explanation

The main purpose of the light-dependent reactions in photosynthesis is to generate ATP and NADPH.

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DOK Level 2: Skill/Concept

Abigail and Zoe are studying photosynthesis in their biology class. Explain the role of water in the light-dependent reactions of photosynthesis.

• It provides electrons and protons and releases oxygen as a by-product.

• It acts as a solvent for glucose.

• It is used to transport nutrients.

• It is not involved in the light-dependent reactions.

Answer explanation

Water provides electrons and protons, and releases oxygen as a byproduct in the light-dependent reactions of photosynthesis.

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DOK Level 2: Skill/Concept

Match the following statements about light intensity and the rate of photosynthesis.

• Photosynthesis rate keeps rising with increasing light intensity.

• As light intensity increases, the rate of photosynthesis initially increases and then levels off.

• The rate of photosynthesis shows a saturation point with increasing light intensity.

• As light intensity increases, the rate of photosynthesis decreases.

• Higher light intensity results in a lower rate of photosynthesis.

• As light intensity increases, the rate of photosynthesis continuously increases without leveling off.

• Photosynthesis rate remains unchanged regardless of light intensity.

• Light intensity has no effect on the rate of photosynthesis.

Answer explanation

As light intensity increases, the rate of photosynthesis initially increases and then levels off.

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DOK Level 3: Strategic Thinking

​ (a)   is the process where Benjamin and Arjun learned how plants use energy from the ​ (b)   to convert water and ​ (c)   into ​ (d)   with oxygen as a waste product.​

• Photosynthesis

• sun

• carbon dioxide

• glucose

• Respiration

Answer explanation

Photosynthesis is the correct choice because it is the process where plants use energy from the sun to convert water and carbon dioxide into glucose with oxygen as a waste product.

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NGSS.HS-LS2-5

NGSS.HS-LS1-5

Fill in the equation for photosynthesis that Anika and Henry learned in class:

​ (a)   + Water --​ (b)   --> ​ (c)   + Glucose

• Carbon dioxide

• Light

• Oxygen

Answer explanation

The correct choices for the blanks are Carbon dioxide, Oxygen, and Light, as they are the components involved in the process of photosynthesis where carbon dioxide and water are converted into glucose and oxygen with the help of light.

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NGSS.HS-LS2-5

NGSS.HS-LS1-5

Grace and Ethan are conducting an experiment on how the rate of photosynthesis changes with increasing carbon dioxide concentration. According to a typical graph, what do they observe?

• It decreases continuously.

• It increases and then levels off.

• It remains constant.

• It decreases and then increases.

Answer explanation

According to a typical graph, the rate of photosynthesis increases with increasing carbon dioxide concentration and then levels off.

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NGSS.HS-LS2-5