Question

Which of the following statements are TRUE with regard to the similarities between Crassulacean
Acid Metabolism (CAM) and C4 cycle?
P. Stomata open during night and remain closed during the day
Q. PEPcase is the carboxylating enzyme to form C4 acid
R. C4 acid is decarboxylated to provide CO2 for C3 cycle
S. Kranz anatomy is predominant in both CAM and C4 plants
(A) P, S (B) Q, R (C) P, Q (D) R, S

Answer 1

Hello mate.

Thanks for asking this question.

your answer is =>

(P) => as you know that crassulacean acid metabolism is a characteristic process carried out by plants under Crassulaceae family ( succulent Xerophytes).

these plants are grown in the areas where there is an extreme lack of water.

so these plants close their stomata in day time to prevent transpiration i.e. wastage of water due to evaporation and open them in dark or night.

but $C_4$ plants can tolerate a temperature as high as upto 35-45 °c since their water conditions are rich.

so , first option is true for CAM plants but false for $C_4$ plants..

so option $P$ is $False$.

(Q) => seconds option i.e. Q is very perfect as Pyro enol phosphate carboxylase ( PEP-carboxylase) catalyses the reaction of OAA i.e. oxalo acetate to malic acid both of which are 4-C compounds.

option $Q$ is $true$.

(R) => in $C_4$ pathway , 4-C compound MALIC ACID when enters the bundle sheath cells , releases 1 molecule of $CO_2$ which is then carried towards $C_3$ pathway .This process is called $\underline {Decarboxylation}$.

so option $R$ is $true$.

(S) => Kranz anatomy is present only in $C_4$ plants but not in CAM i.e. Crassulacean acid metabolism dependant plants.

so option $S$ is $false$.



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