Topic 6 - Plant Structures And Their Features Flashcards
What type of reaction is photosynthesis
Endothermic
What is the rate of reaction directly proportional to
Light intensity
What is the rate of photosynthesis inversely proportional to
Distance from a light source.
What 2 adaptations have root hair cells made
- Hairs for a larger surface area
2. No chloroplasts
Why are the cells in the xylem dead
They contain lignin to keep the stems structure but it consequently kills the cells
What don’t xylem cells have
Any internal structures
What 2 cells are in the phyloem
Phloem vessel cells and companion cells
Why are companion cells in the phloem
Because the vessel cells contain no mitochondria so need an energy source
What cells are in the leafs where photosynthesis occurs
The palicide cells
How do the stomata work
The stomata are surrounded by 2 guard cells that swell and change shape to allow the stomata to open for gas diffusion
What 4 factors increase the rate of transpiration
- Light intensity
- Dry conditions
- Wind
- Higher temperature
What are between the phloem vessel cells and what’s their function
Seive plates and they allow the sugars to move through the cells
Why don’t xylem cells have a cell wall
To allow water to flow up xylem easily
What are photosynthetic organisms the main producers of
Food and therefore biomass
How do greenhouses increase yield
Heat, light and release CO2 into the greenhouses
