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Photo & Resp
Photosynthesis & Respiration
| Question | Answer |
|---|---|
| What is photosynthesis? | Photosynthesis is the conversion of light energy into chemical energy that is stored in sugar. |
| Why are plants called autotrophs? | Plants are called autotrophs because they make their own food through photosynthesis. |
| What are autotrophs? | Autotrophs are living organisms that can produce their own food for energy. |
| Why are the leaves and stems of a plant green? | The green color comes from the light that plants absorb and reflect. Plants absorb most all colors except green light. The green light that is reflected gives the plant its green color. |
| What do plants use to create chemical energy (sugar/glucose)? | Plants use CO2 (carbon dioxide), H2O (water), and light energy. |
| What is the chemical equation for photosynthesis? | 6CO2+12H2O+light ---> 6O2+6H2O+C6H12O6 |
| When do the light reactions take place? | The light reactions take place during the day because they need light. |
| When do the dark reactions take place? | They occur during the night and the day because they don't need the light, just the energy. |
| What systems are the light reactions composed of? | Photosystem 1 and 2 compose the light reactions. Photosystem 2 occurs before photosystem 1. |
| What is a chloroplast? | The chloroplast is the organelle that is responsible for photosynthesis. |
| Where are chloroplasts located? | Chloroplasts are located in the green parts of a plant. They are found mainly in the mesophyll cells of the planet. |
| What is the chloroplast composed of? | It is composed of a double membrane, a dense fluid called the stroma, thylakoids, and granum or the stacks of thylakoids. |
| How does CO2 enter the leaf and O2 leave? | CO2 enters through the stomata and O2 leaves through the stomata. |
| Where does the released oxygen come from? | The released oxygen comes from water, which is split through hydrolysis. |
| What are the two main reactions in photosynthesis? | They are the dark reactions (Calvin Cycle), and the light reactions. |
| What does NADP+ do in photosynthesis | NADP+ stores energized electrons taken from water. |
| What does carbon fixation do? | Carbon fixation incorporates carbon into organic compounds for later use. |
| What is the electromagnetic spectrum, and what does it have to do with photosynthesis? | This is the entire range of radiation. The band between 380nm and 780nm is important because it is the spectrum seen by the human eye and the light that plants absorb. |
| What is the spectrophotometer? | This reads the amount of light absorbed and helps read the amount of light absorbed by photosynthesis. |
| What is the spectrum of light that plants absorb called? | The absorption spectrum |
| What is the action spectrum? | It is the light that is absorbed and has the most effectiveness. |
| What are carotenoids? | These are the other pigments plants have that we see a lot of in the fall (i.e. red, orange, yellow, brown) |
| What is a benefit of carotenoids? | They give plants photoprotection, which absorbs and dissipates excess light that may damage chlorophyll or interact with oxygen to form reactive oxidative molecules that can harm the cell. |
| What happens when a photon of light is absorbed? | With on photon of light, an electron enters an excited state. |
| What happens to the "excited" electron? | The electron becomes unstable, causing the electron to lose energy as heat. |
Created by:
cpemberton96
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