Photosynthesis Flashcards
(45 cards)
What are three methods for measuring the rate of photosynthesis?
- The rate of oxygen output
- The rate of carbon dioxide uptake
- The rate of carbohydrate production
These methods are not perfect due to the simultaneous process of respiration in plants.
List three factors that affect the rate of photosynthesis.
- Light intensity
- Carbon dioxide concentration
- Temperature
The amount of chlorophyll also impacts the rate of photosynthesis.
What happens to the rate of photosynthesis when light intensity is increased?
The rate of photosynthesis increases until a limiting factor becomes in short supply
At very high light intensities, photosynthesis can be slowed or inhibited.
True or False: Photosynthesis can occur at very high light intensities in nature.
False
Very high light intensities that inhibit photosynthesis do not occur in nature.
How does carbon dioxide concentration affect the rate of photosynthesis?
Increasing carbon dioxide concentration increases the rate of photosynthesis until a limiting factor arises
Carbon dioxide is one of the essential reactants in photosynthesis.
What role do enzymes play in photosynthesis?
Enzymes control the chemical reactions that combine carbon dioxide and water to produce glucose
The rate of photosynthesis is affected by temperature due to enzyme activity.
What happens to enzymes at high temperatures?
Enzymes are denatured
Denaturation affects the rate of photosynthesis.
What is chlorophyll’s role in photosynthesis?
Chlorophyll absorbs light energy required to convert carbon dioxide and water into glucose
Chlorophyll reflects the green part of the electromagnetic spectrum.
What is the compensation point in photosynthesis?
The light intensity at which the rate of photosynthesis equals the rate of respiration
This point is observed when measuring oxygen production or carbon dioxide uptake.
Fill in the blank: Chlorophyll is _____ and absorbs red and blue light while reflecting green light.
green
This property allows chlorophyll to effectively facilitate photosynthesis.
What process do plants use to make their own food?
Photosynthesis
Photosynthesis allows plants to convert light energy into chemical energy.
What two inorganic molecules are used in photosynthesis?
- Carbon dioxide
- Water
These molecules are essential for the production of glucose.
What is produced during photosynthesis?
Glucose
Glucose serves as an energy source for plants.
What type of reaction is photosynthesis?
Endothermic
This means that the reaction absorbs energy from the surroundings.
What pigment absorbs light energy for photosynthesis?
Chlorophyll
Chlorophyll is crucial for capturing light energy.
Where is chlorophyll found in plant cells?
Chloroplasts
Chloroplasts are the organelles where photosynthesis occurs.
What are the main photosynthetic organs of plants?
Plant leaves
Leaves are primarily responsible for photosynthesis.
How does carbon dioxide enter the leaves?
Through the stomata
Stomata are small openings on the leaf surface.
What is the role of xylem in photosynthesis?
Transporting water to the leaves
Xylem vessels carry water absorbed by the roots.
What waste product is formed during photosynthesis?
Oxygen
Oxygen is released into the atmosphere, benefiting animals and microorganisms.
What happens to some of the glucose produced by photosynthesis?
It is used for respiration
Respiration is the process by which plants convert glucose into energy.
What is biosynthesis in relation to photosynthesis?
The process of creating materials needed for plant life from glucose
Biosynthesis is essential for growth and development.
Fill in the blank: Photosynthesis requires energy in the form of _______.
Light
Light energy drives the chemical reactions in photosynthesis.
True or False: The equation for photosynthesis is the reverse of the respiration equation.
True
Photosynthesis and respiration are complementary processes.
