Summary
Transport in flowering plants involves the movement of water, minerals, and food through specialized tissues called xylem and phloem. Xylem — conducts water and dissolved minerals from the roots to all parts of the plant. Example: Xylem vessels are made up of dead cells and provide mechanical support. Phloem — carries food made in the leaves by photosynthesis to other cells of the plant. Example: Phloem consists of living cells called sieve tubes and companion cells. Transpiration — the process of water movement through a plant and its evaporation from aerial parts. Example: Transpiration pull helps in the upward movement of water. Translocation — the transport of manufactured food from leaves to other parts of the plant. Example: Sugars are transported from source to sink via phloem.
Exam Tips
Key Definitions to Remember
- Xylem: Conducts water and minerals from roots to leaves.
- Phloem: Transports food from leaves to other parts of the plant.
- Transpiration: Evaporation of water from plant leaves.
- Translocation: Movement of food substances in phloem.
Common Confusions
- Confusing xylem with phloem functions.
- Misunderstanding the role of transpiration in cooling plants.
Typical Exam Questions
- What is the role of xylem in plants? Xylem conducts water and minerals from roots to leaves.
- How does transpiration benefit plants? Transpiration helps in cooling and creates a transpiration pull for water movement.
- What is translocation and where does it occur? Translocation is the movement of food through phloem from leaves to other parts.
What Examiners Usually Test
- Understanding of xylem and phloem functions.
- The process and importance of transpiration.
- The mechanisms of water and food transport in plants.
