Question

name: ______
review the plant lab. draw the test tubes in the spaces below. make sure to include color.
light (before) \t\t\tdark (before)

light (after) \t\t\tdark (after)

what does the lab tell us about when photosynthesis takes place?
where does photosynthesis take place in a cell?
what does the lab tell us about when cellular respiration takes place?
where does cellular respiration take place in a cell?
which process above takes place more overall in plants?
what is the balanced chemical equation for photosynthesis?
all energy obtained by organisms from food can be traced back to where?

Explanation:

1. What does the lab tell us about when photosynthesis takes place?

Photosynthesis requires light energy, so from the lab (with LIGHT and DARK conditions), we can infer that photosynthesis takes place in the presence of light (the LIGHT - before and LIGHT - after setup would show changes due to photosynthesis, while DARK would not show photosynthetic changes as prominently or at all).

2. Where does photosynthesis take place in a cell?

Photosynthesis takes place in the chloroplasts of plant cells. Chloroplasts contain chlorophyll which captures light energy for the process.

3. What does the lab tell us about when cellular respiration takes place?

Cellular respiration is a process that occurs continuously in cells (both in light and dark), but the lab might show that even in the dark (when photosynthesis is not occurring), there are changes (like gas exchange) indicating cellular respiration is ongoing as it does not require light.

4. Where does cellular respiration take place in a cell?

Cellular respiration occurs in the mitochondria (and also in the cytoplasm for glycolysis). The mitochondria are the powerhouses of the cell where the majority of ATP production from respiration occurs.

5. Which process above takes place more overall in plants?

Overall, in plants, photosynthesis produces glucose and oxygen, and cellular respiration consumes glucose and oxygen. But over a period with sufficient light, photosynthesis produces more (to support growth, storage, and respiration needs), but if we consider the entire life cycle including night, respiration is continuous but photosynthesis is during the day. However, for the plant's growth and energy storage, photosynthesis (when light is available) produces more biomass overall.

6. What is the balanced chemical equation for photosynthesis?

The balanced chemical equation for photosynthesis is $6CO_2 + 6H_2O \xrightarrow[Chlorophyll]{Light} C_6H_{12}O_6 + 6O_2$. Carbon dioxide and water, in the presence of light and chlorophyll, react to form glucose and oxygen.

7. All energy obtained by organisms from food can be traced back to where?

All energy in food for organisms can be traced back to the sun. Producers (plants) capture solar energy via photosynthesis, and this energy is transferred through the food chain to consumers.

Answer:

1. Photosynthesis takes place in the presence of light.
2. Photosynthesis takes place in the chloroplasts of plant cells.
3. Cellular respiration takes place continuously (in light and dark), but the lab may show it occurs even without light (as photosynthesis needs light, but respiration does not).
4. Cellular respiration takes place in the mitochondria (and cytoplasm for glycolysis).
5. Photosynthesis (when light is available) takes place more overall in plants (to support growth, storage, and respiration).
6. The balanced chemical equation for photosynthesis is $\boldsymbol{6CO_2 + 6H_2O \xrightarrow[Chlorophyll]{Light} C_6H_{12}O_6 + 6O_2}$.
7. All energy from food can be traced back to the sun.