Summary and Exam Tips for Translocation
Translocation is a subtopic of Transport in Plants, which falls under the subject Biology in the Cambridge IGCSE curriculum. Translocation refers to the movement of sucrose and amino acids in the phloem from sources (regions of production) to sinks (regions of storage or utilization). Carbohydrates like sucrose and glucose, and proteins in the form of amino acids, are transported in various directions within the plant. This includes movement from photosynthesizing leaves to roots for storage, and upwards to growing buds, flowers, leaves, and fruits for respiration and growth. Additionally, substances can move from storage organs such as root tubers to other parts of the plant.
Glucose, a product of photosynthesis, is stored as sucrose, which enters the phloem vessels for distribution. For instance, root cells convert sucrose into glucose for respiration and storage, while growing cells use it to make cellulose for cell walls. Sucrose also plays a role in attracting insects by forming nectar. Amino acids are essential for growth, as they are transported to various tissues to synthesize proteins.
Exam Tips
- Diagram Identification: Remember, in diagrams showing a cross-section of a root, stem, or leaf, xylem is always on the inside, and phloem is on the outside.
- Fair Test Design: Ensure that all variables, except the one being tested, remain constant to maintain a fair test.
- Source and Sink Dynamics: Understand that parts of a plant can act as both a source and a sink at different times, depending on the plant's needs.
- Key Terms: Focus on understanding and using key terms like sucrose, amino acids, phloem, source, and sink accurately in your answers.
- Practical Applications: Consider how translocation supports plant growth and survival, such as in the production of nectar or the formation of cellulose.
