CBSE Class 11 (Science) Photosynthesis in Higher Plants — practice questions
92 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 11 (Science) Photosynthesis in Higher Plants in the app →Photosynthesis primarily occurs in which organelle?Chlorophyll absorbs light most strongly inThe Calvin cycle (dark reactions) occurs inThe oxygen released during photosynthesis comes fromThe enzyme that fixes CO₂ in the Calvin cycle isThe first stable product of CO₂ fixation in C4 plants isIn photosynthesis, the oxygen released into the atmosphere comes fromInside a leaf cell, photosynthesis is carried out inWhy do healthy leaves look green?The molecular oxygen released during photosynthesis comes fromCyclic photophosphorylation differs from non-cyclic in that itPer Mitchell's chemiosmotic hypothesis, ATP synthesis in chloroplasts is driven byThe enzyme RuBisCO catalyses the joining of CO₂ to which molecule?To synthesise one molecule of glucose, the Calvin cycle must consumeC3 plants are so named becauseKranz anatomy of C4 plants isBlackman's law of limiting factors says thatThe MAIN photosynthetic pigment in green plants is:Light reactions of photosynthesis occur in the:In photosynthesis, the source of O2 released into the atmosphere is:In the Z-scheme of photosynthesis, electrons flow:In the Calvin cycle, CO2 is fixed by the enzyme:The C4 pathway (Hatch-Slack) uses which enzyme for the initial CO2 fixation?CAM plants (like cactus and pineapple) open their stomata mainly:The colour of light LEAST absorbed by chlorophyll (and most reflected by leaves) is:Chlorophyll-a primarily absorbs:Carotenoids serve in photosynthesis as:Photolysis of water occurs at:ATP in light reactions is made by:RuBisCO catalyses the addition of CO₂ to:CAM plants open stomata at night to:Which plant did Priestley place in a closed bell jar with a mouse?Who showed that sunlight is needed for plants to purify fouled air?Who provided evidence around 1854 that glucose is produced when plants grow?Engelmann used which green alga to describe the first action spectrum?In Engelmann's experiment, aerobic bacteria gathered mainly in which light regions?According to van Niel's inference, the O2 released in plant photosynthesis comes from what?How many water molecules appear as substrate in the overall balanced equation of photosynthesis?Which part of the chloroplast traps light energy and makes ATP and NADPH?Where inside the chloroplast do enzymes synthesise sugar and starch?Paper chromatography of leaf pigments shows how many different pigments?Which pigment appears bright or blue green on a leaf chromatogram?What colour do xanthophylls show on a leaf pigment chromatogram?Which pigment is the chief pigment associated with photosynthesis?Chlorophyll a absorbs maximally in which two regions of the spectrum?Photosystems I and II are numbered according to what?The light harvesting pigments of a photosystem are also called what?What forms the reaction centre of each photosystem?The reaction centre of PS I absorbs best at what wavelength?Which reaction centre belongs to photosystem II?Electron flow from PS II to PS I to NADP+ is named after which letter?With which photosystem is the water splitting complex associated?Splitting of water at PS II yields which set of products?Which source supplies the electrons that replace those lost by PS I?The synthesis of ATP from ADP and inorganic phosphate in light is called what?When PS II and PS I work in series, which process occurs?Which products come from non-cyclic electron flow?Which photosystem alone functions in cyclic photophosphorylation?What is made by cyclic electron flow?Which chloroplast membranes lack PS II and the NADP reductase enzyme?Cyclic photophosphorylation also occurs when only light of what wavelengths is available?In photosynthesis, where do protons accumulate during electron transport?What happens to the pH of the lumen as protons accumulate there?On which side of the thylakoid membrane is NADP reductase located?Which ATP synthase part protrudes on the stroma-facing side of the thylakoid?Which part of ATP synthase forms a transmembrane channel for protons?Which radioactive isotope did Melvin Calvin use in his algal photosynthesis studies?What was the first product of CO2 fixation identified by Calvin?How many carbon atoms does a PGA molecule have?Which 4-carbon acid is the first stable CO2 fixation product in C4 plants?What is the primary CO2 acceptor in the Calvin cycle?In which plants does the Calvin pathway operate?Which are the three stages of the Calvin cycle?Carboxylation of RuBP gives how many molecules of 3-PGA?How many ATP molecules does the Calvin cycle need per CO2 molecule entering it?How many ATP molecules are used to make one glucose molecule through the Calvin cycle?How many turns of the Calvin cycle are needed to form one glucose molecule?The C4 pathway is typical of plants adapted to which regions?Kranz anatomy refers to large cells around the vascular bundles. What are they called?Which describes bundle sheath cells of a C4 leaf?Which of these plants is a C4 plant with Kranz anatomy in its leaves?By what other name is the C4 pathway known?Which cells of a C4 leaf lack the enzyme RuBisCO?In C4 plants, in which cells does the Calvin cycle take place?Which 4-carbon acids move from the mesophyll to the bundle sheath in C4 plants?What does the photorespiratory pathway produce?Photorespiration does not occur in which plants?Which is called the most abundant enzyme in the world?Light saturation for photosynthesis occurs at what share of full sunlight?What is the CO2 concentration in the atmosphere?C4 plants reach CO2 saturation at about which level?Which greenhouse crops are grown in CO2 enriched air for higher yields?