Photosynthesis
Overview
Almost all the food on Earth, and the oxygen you are breathing right now, can be traced back to one process happening in green leaves: photosynthesis. Plants capture the energy of sunlight and lock it into sugar, building food out of nothing more than carbon dioxide and water.
In this lesson you will learn exactly what photosynthesis is, the word equation you must know by heart, the role of chlorophyll, and, at Extended level, the balanced symbol equation. By the end you will be able to explain how plants make their own food and why that matters for every living thing.
Objectives
- [Core] Describe photosynthesis as the process by which plants synthesise carbohydrates from raw materials using energy from light
- [Core] State the word equation for photosynthesis as: carbon dioxide + water → glucose + oxygen in the presence of light and chlorophyll
- [Core] State that chlorophyll is a green pigment that is found in chloroplasts
- [Core] Investigate and understand the need for chlorophyll, light and carbon dioxide for photosynthesis
- [Supplement] State the balanced symbol equation for photosynthesis as: 6CO + 6H O → C H O + 6O 2 2 6 12 6 2
- [Supplement] State that chlorophyll transfers energy from light into energy in chemicals, for the synthesis of carbohydrates
- [Supplement] Understand and describe the effect of varying light intensity, carbon dioxide concentration and temperature on the rate of photosynthesis
- [Supplement] Understand and describe the effect of light and dark conditions on gas exchange in an aquatic plant using hydrogencarbonate indicator solution
Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Photosynthesis. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- The raw materials for photosynthesis are: A. glucose and oxygen B. carbon dioxide and water C. oxygen and water D. glucose and carbon dioxide Answer: B
- In the word equation for photosynthesis, the products are: A. carbon dioxide + water B. glucose + oxygen C. starch + carbon dioxide D. oxygen + water Answer: B
- Chlorophyll is found in the: A. nucleus B. mitochondria C. chloroplasts D. ribosomes Answer: C
- The role of chlorophyll is to: A. produce carbon dioxide B. absorb light energy and transfer it to chemical energy C. store glucose D. release water Answer: B
- The balanced symbol equation for photosynthesis is: A. CO2 + H2O -> C6H12O6 + O2 B. 6CO2 + 6H2O -> C6H12O6 + 6O2 C. 6CO2 + H2O -> C6H12O6 + O2 D. CO2 + 6H2O -> 6C6H12O6 + O2 Answer: B
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Recommended Books
Practice Mock Questions
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