Cambridge checkpoint science workbook 8
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600 years
We know from the fossils that were left on rocks which we were
able to identify how old those rocks were.
3000 million years ago, organisms that could photosynthesise
first appeared on the planet.
This is because any animal-like organisms depend on oxygen to
survive, and since there was no oxygen before the plants appeared,
the organism couldn’t live. Plants do not need any oxygen to
survive,
so this is the reason why they were able to survive on Earth when
oxygen had not been there yet.
The colour of the light.
The number of bubble produced by the pondweed.
The amount of water in each test tube.
The same size of pondweed.
The type of plant (pondweed).
25
20
15
10
5
faste
st
com
faste
faste
st
com
faste
st
com
Conclusion - Colourless light makes the plant photosynthesize
fastest compared to the red, green and blue light.
