B4 Photosynthesis

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How do green plants make their own food (glucose and starch)?
using sunlight
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What is green plants using sunlight to make their food called?
photosynthesis
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What does photosynthesis produce glucose for?
biomass and energy
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In photosynthesis what is oxygen released as?
a by-product
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What is the word equation for photosynthesis?
Carbon Dioxide + Water + Light --> Oxygen + Glucose
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What chemical equation for photosynthesis?
6CO2 + 6H2O > C6H12O6 + 6O2
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What did Greek Scientists think about photosynthesis?
they thought that plants gained mass only by taking in minerals from the soil
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After many experiments what was Van Helmont's conclusion?
that plant growth cannot be due only to the nutrients in the soil
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What did Joseph Priestley do?
put a plant in a jar of air, and a plant in a jar with a mouse inside. He changed the combinations of plant and mouse and concluded that oxygen is produced by plants
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What can the glucose produced in photosynthesis be used for?
to immediate produce energy through respiration or it can be converted into
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What are 4 things glucose and starch can be converted into?
1. energy (during repiration) 2. proteins for growth and repair 3. starch,fats or oils that can be stored in seeds 4. cellulose which is needed for plant cell walls
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Glucose is what?
soluble
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How can glucose be transported around the plant?
as a soluble starch
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When must glucose be converted into starch (which is insoluble)?
in order to be stored
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Starch is a very useful what?
storage molecule
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Why is starch insoluble?
so it doesn't affect the water concentration inside the cells where it's stored. it also does not move away in solution from storage areas
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What would happen if the cells stored soluble glucose?
the inside of the cell would become very concentrated and water would constantly move through it in osmosis, which would make the cell swell
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What did the scientists discover when using radioactive oxygen 18?
that the oxygen produced as a by-product in photosynthesis comes from the water and not the carbon dioxide
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What only happens when oxygen-18 is introduced via the water?
you get a radioactive waste product of oxygen
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What does when oxygen 18 is introduced via the water you get a radio active waste product of oxygen show?
shows that photosynthesis is a two-stage process. Firstly, light energy is used to split water, releasing oxygen gas and hydrogen ions. Secondly, the carbon dioxide gas combines with the hydrogen (ions) to make glucose.
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What do plants need to grow?
light and warmth
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Why do plants grow faster in the summer
due to light and warmth
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What are the 3 ways photosynthesis can be increased?
1. the temp (using heaters in a greenhouse) 2. light intensity (lamps in a greenhouse) 3. carbon dioxide concentration (using chemicals, or as a by-product of using gas heaters in a greenhouse)
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What happens when the temp rises?
so does the rate of photosynthesis
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What is the limiting factor in the rate of photosynthesis?
temp, light or carbon dioxide
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What happens as the temp reaches 45 degrees celcuis?
enzymes start the denature and the rate of photosynthesis declines to zero
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What happens as the carbon dioxide concentration rises?
so does the rate of photosynthesis
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Carbon dioxide is limiting what?
the rate of photosynthesis up to a certain point - after this point a rise in carbon dioxide has no effect- so the limiting factor must be light or temp
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As the light intensity increases so does what?
the rate of photosynthesis
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When a rise in light intensity has no effect what is the limiting factor?
carbon dioxide or temp
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Why do plants respire?
to break down glucose to release energy
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When do plants respire?
all the time
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What happens in the day (respiration)?
light is avalibale from the sun so plants photsynthesise, taking in carbon dioxide to make glucose and release oxygen as a by-product
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What happens in the day and night (respiration)?
they repire, absorbing oxygen and giving out carbon dioxide
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Respiration is the opposite of?
Photosynthesis
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Why do plants give out oxygen in the day?
because plants photosynthesise much faster than they respire when light is available
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Card 2

Front

What is green plants using sunlight to make their food called?

Back

photosynthesis

Card 3

Front

What does photosynthesis produce glucose for?

Back

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Card 4

Front

In photosynthesis what is oxygen released as?

Back

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Card 5

Front

What is the word equation for photosynthesis?

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