Biology
Photosynthesis in Plants
1,492 Questions
Photosynthesis is the biological process by which plants convert light energy into chemical energy. This page contains practice questions covering essential topics like chlorophyll, light reactions, and the pathways specific to plants. This material is crucial for medical entrance exams and academic assessments.
Chlorophyll and pigmentsLight reactionsCalvin cycleCAM plantsElectron transportPhotosynthesis factors
Photosynthesis in Plants Questions
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reduction of H2O
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oxidation of H2O
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oxidation of CO2
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oxidation of NO2
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B
Correct answer
Explanation
Light reaction takes place in the thylakoid discs where water is oxidised and oxygen is released. The electrons that are freed-up from water are transferred to ATP and NADPH.
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blue-green pigment
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red pigment
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brown pigment
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yellow-brown pigment
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A
Correct answer
Explanation
Correct Answer: blue-green pigment
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O2 is taken and CO2 is evolved
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O2 is taken but CO2 is not evolved
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CO2 is taken and O2 is evolved
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CO2 is taken and NO2 is evolved
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NO2 is evolved
C
Correct answer
Explanation
Correct Answer: CO2 is taken and O2 is evolved
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r-phycocyanin
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r-phycoeythrin
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c-phycocyanin
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anthocyanin
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B
Correct answer
Explanation
Phycoerythrin is a red protein-pigment complex from the light-harvesting phycobiliprotein family. It is present in red algae and cryptophytes, accessory to the main chlorophyll pigments. It is responsible for photosynthesis.
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photosynthetic red algae
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photosynthetic green algae
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photosynthetic blue-green algae
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photosynthetic purple bacteria
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D
Correct answer
Explanation
Purple bacteria or purple photosynthetic bacteria are proteobacteria that are phototrophic. They are capable of producing their own food via photosynthesis. They are pigmented with bacteriochlorophyll a or b, together with various carotenoids, which gives them colours ranging among purple, red, brown and orange. It does not evolve oxygen.
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carbon dioxide & water
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sunlight
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chlorophyll
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oxygen
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As it can occur in the dark
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As it does not require direct light
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As it cannot occur during daytime
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As it occurs more rapidly at night
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Mushroom
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Alga
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Amoeba
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Plasmodium
B
Correct answer
Explanation
From all the above given organisms, only alga can perform photosynthesis.
C
Correct answer
Explanation
The C3 cycle is initiated by the enzyme Rubisco that catalyses the carboxylation of the CO2 acceptor molecule ribulose-1,5-bisP (RuBP). It results in the formation of 3-phosphoglyceraldehyde.
C
Correct answer
Explanation
PEP is the first acceptor of carbon dioxide in C4 plants.
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Fructose 1,6-diphosphate
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Ribulose 1,5-diphosphate
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Xylulose 5-phosphate
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Phosphoglyceraldehyde
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D
Correct answer
Explanation
The first stable product is a 3-carbon compound called as phosphoglyceraldehyde. Hence, it is named C3 cycle.
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organic fuel
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energy
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cytochromes
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light
B
Correct answer
Explanation
Both respiration and photosynthesis require energy.
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Membranes
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Stroma
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Thylakoids
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None of these
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Phytochrome
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Crypytochrome
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Chlorophyll
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Anthocyanin
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A
Correct answer
Explanation
Photoperiodism can also be defined as the developmental response of plants to the relative lengths of light and dark periods. Phytochrome is a plant hormone that detects light.
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fixation of carbon dioxide.
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release of oxygen from water.
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excitation of chlorophyll by sunlight.
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formation of carbohydrates.
C
Correct answer
Explanation
The first step in a photosynthetic process, is the excitation of chlorophyll by sunlight.