📚 Topic Summary
The Calvin Cycle, also known as the light-independent reactions or dark reactions of photosynthesis, is a series of biochemical reactions that occur in the stroma of chloroplasts in plants and other photosynthetic organisms. It's where carbon dioxide ($CO_2$) from the atmosphere is converted into glucose, a sugar molecule that the plant uses for energy. This process, called carbon fixation, is powered by ATP and NADPH, which are produced during the light-dependent reactions of photosynthesis. Think of it as the sugar factory of the plant! 🏭
🧪 Part A: Vocabulary
Match the terms with their correct definitions:
| Term |
Definition |
| 1. RuBisCO |
a. A five-carbon sugar molecule involved in carbon fixation. |
| 2. Carbon Fixation |
b. The enzyme that catalyzes the first major step of carbon fixation. |
| 3. Stroma |
c. The process of converting inorganic carbon ($CO_2$) to organic compounds. |
| 4. RuBP |
d. Energy currency used in the Calvin Cycle. |
| 5. ATP |
e. The fluid-filled space surrounding the thylakoids inside a chloroplast. |
(Answers: 1-b, 2-c, 3-e, 4-a, 5-d)
🌱 Part B: Fill in the Blanks
Complete the paragraph with the correct terms:
The Calvin Cycle begins with a process called ______ where carbon dioxide ($CO_2$) combines with ______. This reaction is catalyzed by the enzyme ______. The resulting molecule is then converted into ______, using energy from ATP and NADPH. Finally, ______ is regenerated to continue the cycle.
(Answers: Carbon Fixation, RuBP, RuBisCO, G3P, RuBP)
🤔 Part C: Critical Thinking
Explain why the Calvin Cycle is essential for life on Earth. How does it connect to the light-dependent reactions of photosynthesis?