B2.3 Flashcards
What do green plants and algae use to make their food
Light energy
Where do plants get their raw materials to make this food
From the air and soil
What is the photosynthesis equation
Carbon dioxide +water👉🏾 glucose +oxygen
What happens during photosynthesis
Light energy is absorbed by chlorophyll in cells
This energy is used to convert carbon dioxide and water into glucose and oxygen.
Oxygen is released as a by product
What may the rate of photosynthesis be limited by
Shortage of light
Low temperature
Shortage of carbon dioxide
Why do we need all three factors that effect photosynthesis just right
Light , temperature and the availability of carbon dioxide interact
What can the glucose rom photosynthesis be converted into
Insoluble starch for storage
What do plant cells use some of the glucose for
Respiration
What is some of the glucose in plants and algae used for
To produce fats and oils for storage
To produce proteins
To produce cellulose which strengthens cell wall
What do plants use to make proteins
Glucose and nitrate ions that are absorbed from the soil
How come greenhouses increase the rate of photosynthesis
It increases the light intensity
4 advantages of greenhouses
Plants grow faster
Fruits produced earlier
Higher crop yields
Grow fruits unsuitable for uk climate
How to increase CO2 levels
Dissolve different amounts of sodium hydrogencarbonate in the water
How to increase light intensity
Use artificial lights in greenhouse beyond daylight hours
What is hydroponics
Growing plants in water with the right balance of mineral ions
What is aquaponics
Growing plants in water with fish
Mineral ions obtained from fish faeces
Experiment to find ideal conditions for photosynthesis
Use canadian pondweed to measure rate of photosynthesis by measuring amount of oxygen given off
How would you measure rate of photosynthesis
Count how many bubbles given off or more accurately use a gas syringe
What happens as u increase light intensity
The rate of photosynthesis increase to a certain point then levels off as temperature and co2 levels are the limiting factors
What happens as u increase C02 concentration
The rate of photosynthesis increases but to a certain point and levels off as temperature and light intensity are limiting factors
What happens if u increase temperature
The rate of photosynthesis will increase then at 45 degrees the rate of photosynthesis slows down as enzymes denature
