8.1 photosynthesis Flashcards
1
Q
photosynthesis def
A
the process by which plants make food using carbon dioxide, water and light
2
Q
glucose def
A
a simple sugar
3
Q
endothermic reaction def
A
absorbs heat from surroundings
4
Q
which organisms carry out photosynthesis
A
plants and algae
5
Q
what happens during photosynthesis
A
- energy is transferred from the environment to the chloroplasts by light
- the energy is then transferred to convert carbon dioxide and water into glucose
- the chemical reaction also produces oxygen as a by-product
6
Q
why is photosynthesis an endothermic reaction
A
- it needs an input of energy from the environment
- this energy is in the form of sunlight
- the energy from the environment used to break the bonds in carbon dioxide and water is more than the energy transferred back into the environment by the formation of bonds in glucose and oxygen
7
Q
photosynthesis word equation
A
carbon dioxide + water (sunlight)—> glucose + oxygen
8
Q
photosynthesis symbol equation
A
6CO2 + 6H2O (light)—> C6H12O6 + 6O2
9
Q
what is the chemical equation for glucose
A
C₆H₁₂O₆
10
Q
how is the glucose produced by photosynthesis used
A
- some used immediately by the cells of the plant for respiration
- a lot is converted into insoluble starch and stored
11
Q
What do leaves need for photosynthesis?
A
Carbon dioxide, light and water
12
Q
How are algae adapted to photosynthesis
A
- large surface area, absorb CO2 dissolved in the water around them
- oxygen produced also dissolves in water around them as it is released
