MCQ Chapter 12 Biology Class 11 Maharashtra Board Photosynthesis 1. What enzyme fixes CO₂ in the mesophyll cells of C4 plants?RubiscoPEPCOMalic enzymePyruvate kinaseQuestion 1 of 202. Why are C4 plants more productive than C3 plants?They require less ATPThey avoid photorespirationThey have fewer chloroplastsThey use less CO₂Question 2 of 203. What is the primary characteristic of CAM plants?Stomata open during the dayCO₂ fixation occurs at nightThey lack Kranz anatomyThey use the C3 pathway exclusivelyQuestion 3 of 204. What is the process of malic acid formation in CAM plants called?DeacidificationAcidificationCarboxylationPhotolysisQuestion 4 of 205. Which factor most affects photosynthesis by supplying energy?WaterLightTemperatureCO₂ concentrationQuestion 5 of 206. At what wavelength does photosynthesis occur at the highest rate?GreenBlueRedYellowQuestion 6 of 207. What is the typical CO₂ concentration in the atmosphere?0.03%0.3%3%30%Question 7 of 208. What is the optimum temperature for photosynthesis in most plants?10–15°C25–30°C40–45°C55–60°CQuestion 8 of 209. How does water affect photosynthesis?It directly increases CO₂ fixationIt maintains turgidity and protoplasm hydrationIt absorbs light energyIt produces ATPQuestion 9 of 2010. What does Blackman’s law of limiting factors state?All factors equally affect photosynthesisThe slowest factor controls the rate of a processLight is always the limiting factorCO₂ is never a limiting factorQuestion 10 of 2011. What is the significance of photosynthesis in the biosphere?It produces water for plantsIt transforms solar energy into chemical energyIt consumes oxygenIt reduces atmospheric CO₂ to zeroQuestion 11 of 2012. What is released during the photo-oxidation of water?Proton and oxygen onlyElectron and proton onlyProton, electron, and oxygenElectron and oxygen onlyQuestion 12 of 2013. How many NADPH₂ molecules are required to fix 6 CO₂ molecules in the Calvin cycle?6121824Question 13 of 2014. In photorespiration, what does RuBP carboxylase produce under high oxygen conditions?Malic acid and PEPPGA and phosphoglycolatePGA and malic acidGlucose and oxygenQuestion 14 of 2015. What is the correct sequence of electron transport from PS II to PS I?FeS, PQ, PC, CytochromePQ, Cytochrome, PC, FeSPC, Cytochrome, FeS, PQFeS, PQ, Cytochrome, PCQuestion 15 of 2016. Where are the enzymes for the dark reaction located?Inside the thylakoidsIn the stromaIn the granaIn the lumenQuestion 16 of 2017. What is the advantage of having multiple pigment molecules in a photocentre?Increases water splittingEnhances light absorption and energy transferReduces ATP productionPrevents CO₂ fixationQuestion 17 of 2018. Why is photosynthesis considered the most important process in the biosphere?It produces waterIt provides food and oxygen for lifeIt consumes CO₂ completelyIt prevents respirationQuestion 18 of 2019. Why is photolysis of water accompanied by non-cyclic photophosphorylation?It produces glucoseIt provides electrons for the electron transport chainIt fixes CO₂It regenerates RuBPQuestion 19 of 2020. How can you identify a C4 plant?By the presence of Kranz anatomyBy the absence of chloroplastsBy open stomata at nightBy low CO₂ fixationQuestion 20 of 20 Loading...
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