Question

Students read the following information about photosynthesis in their science textbook:

Plants use photosynthesis to make food
Animals get their food from plants
Photosynthesis produces a compound needed for respiration
The students want to build a simple model to represent photosynthesis in plants. They start with the materials shown below that they cut out of paper and label.



image.png

Which list BEST identifies how the arrows should be arranged around the paper leaf in the model to represent the movement of matter and flow of energy during photosynthesis?


image.png


image.png


image.png


image.png

Answer 1

The arrows should point toward the leaf for sunlight, carbon dioxide (CO2), and water (H2O) and point away from the leaf for oxygen (O2) and food (sugars).

Reason: light energy plus CO2 and H2O move into the leaf for photosynthesis; the leaf produces O2 (matter released) and stores energy in food that can be used by the plant or eaten by animals.