The percentage of carbon dioxide in air is……
a) 78 %
b) 21 %
c) 0.03 %
d) 0.9 %
Which of the following process/es maintain the level of carbon dioxide in air?
a) photosynthesis
b) respiration
c) both of them
d) none of them
How much temperature is needed for the process of photosynthesis?
a) very high
b) very low
c) optimum
d) none of them
Increase in temperature above optimum value …….the rate of photosynthesis.
a) speeds up
b) slows down
c) doesn’t affect
d) none of these
Decrease in temperature below optimum value ………the rate of photosynthesis.
a) speeds up
b) lowers down
c) doesn’t affect
d) none of these
Generally the value of optimum temperature for photosynthesis is…….
a) 10 - 15° C
b) 15 - 20° C
c) 20 - 25° C
d) 20 - 30° C
