Photosynthesis In Higher Plants Question 205
Question: Assertion : In the formation of one glucose, 686,000 calories energy are produced. Reason : The energy is provided by a total of 12 NADPH and 18 ATP.
Options:
A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
Show Answer
Answer:
Correct Answer: A
Solution:
The energy balance of photosynthesis is : $ 6CO_2+12H_2O\xrightarrow{light}C_6H_{12}O_6+6CO_2+6H_2O $ which represents a storage of 686,000 calories per mole.
This energy is provided by a total of 12 NADPH and 18 ATP molecules, which represent 750,000 calories.
The efficiency reached by the PCR cycle is thus as high as $ 90%(686/750\times 100=90%) $ .
BETA
