Question

directions: analyze the following model of photosynthesis. model 1

1. label the boxes representing what is needed by the plant to survive and what is created by the plant.
2. what does the direction of the arrow represent in the model?
3. based on the model, what is photosynthesis?
4. how can you infer photosynthesis changes during the day compared to at night?

Explanation:

Question 1

• The top - most box (near the sun) should be labeled "Sunlight" as plants need light energy for photosynthesis.
• The box with an arrow pointing out from the leaf should be labeled "Oxygen" as oxygen is a by - product of photosynthesis.
• The box with an arrow pointing into the leaf should be labeled "Carbon Dioxide" as $CO_2$ is a reactant in photosynthesis.
• The box near the stem (inside the plant) should be labeled "Glucose" as glucose is the main product of photosynthesis that is used by the plant.
• The box near the roots should be labeled "Water" as water is absorbed by the roots and is a reactant in photosynthesis.

In the photosynthesis model, the direction of the arrow represents the flow or movement of substances. Arrows pointing towards the plant represent the substances (like $CO_2$, water, sunlight) that are taken in by the plant for photosynthesis. Arrows pointing away from the plant represent the substances (like oxygen, glucose) that are produced or released by the plant as a result of photosynthesis.

From the model, we can see that the plant takes in carbon dioxide, water, and sunlight. Then, it produces glucose (a type of sugar) and oxygen. So, photosynthesis is the process by which plants use sunlight, carbon dioxide, and water to produce glucose (chemical energy) and release oxygen.

Answer:

• Top - most box: Sunlight
• Box with arrow out of leaf: Oxygen
• Box with arrow into leaf: Carbon Dioxide
• Box near stem: Glucose
• Box near roots: Water

Question 2