At night what is the limiting factor for photosynthesis?
Light intensity
Design an experiment to show how a plant is photosynthesising?
- Use water plant
- Collection chamber over plant
- Leave to collect oxygen
- Collect bubbles
- Use a glowing splint over gas collected
- Rich oxygen will relight splint
Examples of leaf adaptations which maximise the rate of photosynthesis?
- Most leaves are broad, giving them a big surface area for light to fall on
- most leaves are thin so diffusion distances for gases are short
- contain chlorophyll to absorb light
- They have air spaces that allow carbon dioxide to get to the cells and oxygen leave by diffusion
Formula for inverse square law?
Light intensity = 1 / distance^2
How can farmers use their knowledge of limiting factors to increase profits?
- They can control the temperature,light intensity and Co2 to acheive the fastest possible rate of photosynthesis leading to greater yeild
How can the presence of starch be detected in plants?
Use iodine solution should turn blue/black
How can you show the plant gives off oxygen during photosynthesis?
Using a water plant ,collect gas bubbles during photosynthesis. The gas will relight a glowing splint which contains oxygen
How does light intensiity affect rate of photosynthesis?
Increasing light intensity increases rate of photosynthesis until another factor becomes limiting
How does temperature affect The rate of photosynthesis?
The kinetic energy of the particles is increased. The rate decreases past a certain temperature as enzymes become denatured
How dooes the amount of chlorophyll affect photosynthesis?
Decreasing chlorophyll decreases photosynthesis as chlorophyll is required to absorb light energy
How does the amount of CO2 affect rate of photosynthesis?
Increasing co2 increases photosynthesis until another factor is limiting as Co2 is required to make glucose
An investigation of photosynthesis why did a student add sodium hydrogencarbonate to the water?
Because it’s a source of CO2
In winter what is the limiting factor for CO2?
Temperature
Is photosynthesis endothermic or exothermic?
Endothermic it needs energy from the enviroment
What is the energy source for photosynthesis?
Light
What are 5 uses of photosynthesis?
- Respiration
- Startch for storage
- Celluose for strength
- Amino acid and proteinsynthesis
- Lipids for energy storage
What are the main factors that affect photosynthesis?
- Temperature
- Light intensity
- Co2 Concentration
- Amount of chlorophyll
What is a limiting factor?
An enviromental factor which restricts photosynthesis
What is meant by the inverse square law?
The light intensity is inversley proportional to square of the distance
What is photosynthesis?
A chemical reaction that takes place inside a plant producing food for plant to survive
What is the compensation point?
The light intensity at which rate of photosynthesis is equal to the respiration of a plant
What products can glucose be converted into in plants?
- Starch
- celluose
- fats
- proteins
What substance absorbs the energy required for photosynthesis?
Chlorophyll. It is green so absorbs the red and blue parts
Where does photosynthesis take place?
Chloroplasts in leaf pallaside cells
