Unit Six Plant structure and their function Flashcards
What type of reaction is photosynthesis?
Endothermic reaction
Photosynthesis requires energy, which is absorbed from light.
Where does photosynthesis occur in plant cells?
Chloroplasts
Chloroplasts contain chlorophyll, which absorbs light energy.
What is the role of chlorophyll in photosynthesis?
Absorbs light energy
Chlorophyll is essential for converting light energy into chemical energy.
Name the three limiting factors of photosynthesis.
- Light intensity
- Carbon dioxide concentration
- Temperature
These factors can affect the rate at which photosynthesis occurs.
How does light intensity affect photosynthesis?
Increases until a saturation point
Beyond this point, further increases in light do not enhance the rate.
What happens to the rate of photosynthesis with higher carbon dioxide concentration?
Increases until other factors limit it
Carbon dioxide is a key reactant in the photosynthesis process.
At what condition do enzymes controlling photosynthesis work best?
Optimum temperature
Excessively high temperatures can denature these enzymes.
What are the adaptations of leaves for photosynthesis?
- Thin and flat for large surface area
- Stomata for gas exchange
- Veins for water and sugar transport
These adaptations enhance the efficiency of photosynthesis.
What is the function of stomata in leaves?
Allow gas exchange
Stomata are mainly located on the lower surface to minimize water loss.
What does xylem transport?
Water and minerals from roots to leaves
Xylem is essential for maintaining hydration and nutrient supply in the plant.
What process creates a pull in xylem for water transport?
Transpiration
The loss of water vapor through stomata helps to draw water upward.
What does phloem transport?
Dissolved sugars to other parts of the plant
Phloem is crucial for distributing the products of photosynthesis.
What is the process called that moves sugars in phloem?
Translocation
Translocation refers to the movement of carbohydrates throughout the plant.
