PHOTOSYNTHESIS
Level: Grade 12
1.
Which process in nature allows for the carbon dioxide/oxygen ratio in the atmosphere to be maintained at a constant level?
2.
What is the name given to a substance that can absorb light?
3.
The walls of the spongy mesophyll and palisade cells are - - -.
neither thick nor thin.
thin
thick
4.
For an increased rate of photosynthesis the optimal level of carbon dioxide in the atmosphere should be - - -?
.3%
5%
.5%
.05%
5.
The reactions of the light phase take place in the - - - of the chloroplast.
6.
For enzymes controlling the dark phase of photosynthesis to become denatured, the plant has to be exposed to temperatures, on the centigrade scale, above - - -?
50
45
30
40
35
25
7.
To form carbohydrates, hydrogen atoms of the light phase will have to combine with - - -?
carbon dioxide
nitrogen
oxygen
8.
Which molecule in the plant absorbs light?
9.
Carbon dioxide concentration in the atmosphere above .5% proves toxic to plants.
True
False
10.
For photosynthesis to take place, which of the following must exist?
nitrogen
radiant energy
light
water
vapour
oxygen
water
carbon dioxide
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