Nutrition
Overview
Every living thing needs energy and raw materials to survive. Plants capture sunlight and build glucose from carbon dioxide and water, while animals obtain their nutrients by eating other organisms and breaking food down in a specialised digestive system.
In this lesson you will explore photosynthesis in plants - including limiting factors and leaf adaptations - and then turn to human nutrition: the structure of the alimentary canal and the role of digestive enzymes. Both halves of this topic appear regularly in Papers 1 and 2.
Objectives
- Understand the process of photosynthesis and its importance in the conversion of light energy to chemical energy
- Know the word equation and the balanced chemical symbol equation for photosynthesis
- Understand how varying carbon dioxide concentration, light intensity and temperature affect the rate of photosynthesis
- Describe the structure of the leaf and explain how it is adapted for photosynthesis
- Investigate photosynthesis, showing the evolution of oxygen from a water plant, the production of starch and the requirements of light, carbon dioxide and chlorophyll
- Describe the structure and function of the human alimentary canal, including the mouth, oesophagus, stomach, small intestine (duodenum and ileum), large intestine (colon and rectum) and pancreas
- Understand the role of digestive enzymes, including the digestion of starch to glucose by amylase and maltase, the digestion of proteins to amino acids by proteases and the digestion of lipids to fatty acids and glycerol by lipases
Lesson Note
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.
Lesson Evaluation
Congratulations on completing the lesson on Nutrition. 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.
- Which gas is released as a by-product of photosynthesis? A) Carbon dioxide B) Nitrogen C) Oxygen D) Hydrogen Answer: C
- Which part of the leaf contains the most chloroplasts? A) Lower epidermis B) Spongy mesophyll C) Palisade mesophyll D) Waxy cuticle Answer: C
- Lipase breaks down lipids into: A) Glucose and starch B) Amino acids C) Fatty acids and glycerol D) Maltose Answer: C
- Where does most chemical digestion occur in the human body? A) Mouth B) Stomach C) Duodenum D) Large intestine Answer: C
- At high light intensities, increasing light further does not increase the rate of photosynthesis because: A) The plant has run out of chlorophyll B) Another factor has become limiting C) The plant is respiring too fast D) Stomata have closed 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.
Practice Mock Questions
Want to practice mock questions on Nutrition? Download the Green Bridge CBT app to access mock questions and full practice assessments for this topic.
Download The App On Google Playstore
Everything you need to excel in your exams
