iTapuih.com - How Photosynthesis Works dan 30 Soal Explanation Text. Teks di bawah ini membahas tentang proses fotosintesis pada tumbuhan. Pengertian fotosintesis sebagai proses penting bagi tumbuhan untuk mengubah cahaya matahari menjadi energi kimia. Pentingnya bagi kita untuk memahami fotosintesis untuk menghargai mekanisme alam, memahami rantai makanan, dan menjaga kelestarian ekosistem tumbuhan demi kesehatan planet kita.
A. Read the following text to answer question below!
Photosynthesis is a vital process that occurs in plants, enabling them to convert sunlight into chemical energy. This process is fundamental to life on Earth as it produces oxygen and provides food for plants and other organisms.
Photosynthesis occurs in the chloroplasts of plant cells, specifically in the chlorophyll-containing organelles. Chlorophyll absorbs sunlight, which powers the chemical reactions necessary for photosynthesis. During the light-dependent reactions, light energy is absorbed by chlorophyll. This energy is used to split water molecules into oxygen, protons, and electrons. Oxygen is released as a byproduct, contributing to the oxygen we breathe.
In the light-independent reactions (Calvin Cycle), the energy from the light reactions is used to convert carbon dioxide and water into glucose (a sugar molecule) and oxygen. This glucose serves as food for the plant and is essential for growth and development. Photosynthesis not only sustains plant life but also influences the entire ecosystem. It is the basis of the food chain, as plants are primary producers that support herbivores and, subsequently, carnivores. Moreover, photosynthesis plays a crucial role in regulating atmospheric oxygen levels, which are essential for aerobic organisms.
In conclusion, photosynthesis is a complex biochemical process that enables plants to harness sunlight and convert it into chemical energy. This energy sustains plant growth and provides oxygen for all aerobic organisms on Earth. Understanding photosynthesis helps us appreciate the intricate mechanisms of nature and underscores the importance of preserving plant ecosystems for our planet's health and sustainability.
1. Where does photosynthesis primarily occur in plant cells?
A) Mitochondria
B) Nucleus
C) Chloroplasts
D) Golgi apparatus
2. What is the primary role of chlorophyll in photosynthesis?
A) Absorbing carbon dioxide
B) Converting glucose into oxygen
C) Absorbing sunlight
D) Producing water
3. During which phase of photosynthesis are water molecules split?
A) Light-dependent reactions
B) Calvin Cycle
C) Glycolysis
D) Krebs cycle
4. What is released as a byproduct of the light-dependent reactions of photosynthesis?
A) Glucose
B) Carbon dioxide
C) Oxygen
D) Water
5. What does the Calvin Cycle produce from carbon dioxide and water?
A) Glucose and oxygen
B) ATP and NADPH
C) Chlorophyll
D) Starch
6. Which organisms are primary producers in the food chain, thanks to photosynthesis?
A) Herbivores
B) Carnivores
C) Plants
D) Fungi
7. What role does photosynthesis play in the ecosystem?
A) It regulates carbon dioxide levels
B) It provides water for plants
C) It supports herbivores
D) It produces oxygen and food
8. Which statement best describes the Calvin Cycle?
A) It occurs during the night
B) It converts glucose into oxygen
C) It is independent of light
D) It absorbs sunlight
9. Why is photosynthesis essential for aerobic organisms?
A) It produces carbon dioxide
B) It releases nitrogen
C) It produces oxygen
D) It breaks down glucose
10. What is the overall function of photosynthesis in plants?
A) To convert oxygen into sunlight
B) To convert sunlight into chemical energy
C) To convert water into carbon dioxide
D) To convert glucose into oxygen
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B. Read the text first, complete the short answers!
1. What process allows plants to convert sunlight into chemical energy?
2. Where in plant cells does photosynthesis occur?
3. What pigment absorbs sunlight and powers the chemical reactions in photosynthesis?
4. During the light-dependent reactions of photosynthesis, what molecule is split using light energy
5. What gas is released as a byproduct of photosynthesis?
6. In which cycle (reactions) are carbon dioxide and water converted into glucose?
7. What does glucose serve as for the plant?
8. Why are plants considered primary producers in the food chain?
9. How does photosynthesis influence the atmosphere?
10. Why is understanding photosynthesis important?
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| No | Word | Synonym |
|---|---|---|
| 1 | Vital | Transform |
| 2 | Convert | Essential |
| 3 | Chemical energy | Environment |
| 4 | Fundamental | Side product |
| 5 | Absorbs | Maturation |
| 6 | Light-dependent reactions | Photosystems |
| 7 | Byproduct | Crucial |
| 8 | Light-independent reactions | Biochemical energy |
| 9 | Growth and development | Captures |
| 10 | Ecosystem | Calvin Cycle |
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