Assertion: Rubisco is a highly efficient enzyme in terms of its catalytic activity.
Reasoning: Rubisco is capable of catalysing the carboxylation of RuBP and the fixation of CO2, which is an essential step in the Dark Reaction of photosynthesis.
Both Assertion (A) and Reason (R) are true and Reason (R) is a correct explanation of Assertion (A).
Both Assertion (A) and Reason (R) are true but Reason (R) is not a correct explanation of Assertion (A).
Assertion (A) is true but Reason (R) is false.
Assertion (A) is false but Reason (R) is true
Rubisco is not considered to be a highly efficient enzyme, as it can also catalyse a reaction with O2, which leads to a loss of energy and efficiency in the process. This is known as photorespiration and is a wasteful process that can reduce the efficiency of photosynthesis. Therefore, it states that Assertion (A) is false but Reason (R) is true. Hence, the correct answer is option 4.