Study Notes
Plant tissues, organs, and systems are essential for the growth and survival of plants. They include specialized cells and structures that perform specific functions to support the plant's life processes.
- Root Hair Cell — absorbs water and mineral ions from soil.
Example: Thin walls and large surface area for maximum absorption. - Xylem Vessel — conducts water through the plant and provides support.
Example: Thickened walls with lignin and no cell contents. - Phloem Vessel — transports dissolved sugars and amino acids.
Example: Composed of living cells with pores for easy transport. - Palisade Mesophyll Cell — performs photosynthesis.
Example: Contains many chloroplasts and is column-shaped for light absorption. - Waxy Cuticle — reduces water loss by evaporation.
Example: Waterproof layer on the leaf surface.
Exam Tips
Key Definitions to Remember
- Root Hair Cell: Absorbs water and minerals from the soil.
- Xylem Vessel: Conducts water and supports the plant.
- Phloem Vessel: Transports sugars and amino acids.
- Transpiration: Loss of water vapor from plant leaves.
Common Confusions
- Confusing xylem and phloem functions.
- Misunderstanding the role of the waxy cuticle.
Typical Exam Questions
- What is the function of the xylem vessel?
Conducts water and supports the plant. - How does the waxy cuticle benefit the leaf?
It reduces water loss by evaporation. - What is transpiration?
The loss of water vapor from plant leaves.
What Examiners Usually Test
- Understanding of specialized plant cells and their functions.
- Differences between xylem and phloem vessels.
- The process and importance of transpiration in plants.