Translocation
Overview
A leaf makes far more sugar than it can use, while a growing root or a swelling potato makes none at all. Getting food from where it is made to where it is needed is the job of translocation, the movement of sugar and amino acids through the phloem.
This is an Extended-tier topic. In this lesson you will learn exactly what translocation is, what 'sources' and 'sinks' mean, and why the very same part of a plant can switch from being a source to a sink at different times in its life.
Objectives
- [Supplement] Describe translocation as the movement of sucrose and amino acids in phloem from sources to sinks
- [Supplement] Describe: (a) sources as the parts of plants that release sucrose or amino acids (b) sinks as the parts of plants that use or store sucrose or amino acids
- [Supplement] Explain why some parts of a plant may act as a source and a sink at different times
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Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Translocation. 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.
- Translocation is the movement of sucrose and amino acids in the: A. xylem B. phloem C. epidermis D. cortex Answer: B
- A source in a plant is a part that: A. uses or stores sugar B. releases sucrose or amino acids C. only absorbs water D. carries out respiration only Answer: B
- Which of these usually acts as a sink? A. a green leaf in bright light B. a growing root C. a fully photosynthesising leaf D. the air spaces Answer: B
- Compared with water in the xylem, substances in the phloem can move: A. upwards only B. downwards only C. up or down D. not at all Answer: C
- A sprouting potato tuber sending sugar to its buds is acting as a: A. sink B. source C. root hair D. stoma Answer: B
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