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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Sodium carbonate treatment
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Mechanical shearing
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Detergent treatment
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Organic solvent treatment
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Gradient centrifugation
A
Correct answer
Explanation
Treatment with sodium carbonate (Na2CO3) detaches peripheral membrane proteins.
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Green sulphur bacteria
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Purple bacteria
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Acidobacteria
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Heliobacteria
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All of the above
E
Correct answer
Explanation
Anoxygenic photosynthesis is the phototrophic process where light energy is captured and converted to ATP, without the production of oxygen. Water is therefore not used as an electron donor. Green sulfur bacteria, green and red filamentous anoxygenic phototrophs (FAPs), phototrophic purple bacteria, phototrophic Acidobacteria, and phototrophic heliobacteria perform Anoxygenic photosynthesis.
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360 μlL-1
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400 μlL-1
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450 μlL-1
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0.03 per cent
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None of the above
C
Correct answer
Explanation
C3 responds to increased CO2 concentration and saturation is seen only beyond 450 μlL-1.
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Monocot
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Dicot
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Xerophytes
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C3 plants
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C4 plants
C
Correct answer
Explanation
Xerophytes, such as cacti and most succulents, also use PEP carboxylase to capture carbon dioxide in a process called Crassulacean acid metabolism (CAM).
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Ferredoxin is an electron carrier in ETC
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Plastocyanin is an insoluble protein
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Chlorophyll a0 is an early electron acceptor
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QK-A is an early electron acceptor
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MGDG II is a lipid
B
Correct answer
Explanation
Plastocyanin is a soluble protein.
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Mesophyll cells are rich in RuBisCO enzyme.
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Bundle sheath cells lack RuBisCO enzyme.
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Aspartic acid formed in bundle sheath cells is transported to mesophyll cells.
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CO2 is released in bundle sheath cells.
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All of the above
D
Correct answer
Explanation
In the bundle sheath cells these C4 acids are broken down to release CO2 and a 3-carbon molecule.
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Oxygen
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Carbon dioxide
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Nitrogen
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Hydrogen
A
Correct answer
Explanation
During photosynthesis, plants use energy from sunlight to convert carbon dioxide and water into glucose, releasing oxygen as a byproduct. This is the oxygen we breathe.
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haemoglobin
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chlorophyll
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carotene
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xanthophyll
B
Correct answer
Explanation
Chlorophyll is the primary pigment in photosynthesis that absorbs light energy (mainly blue and red wavelengths). Carotene and xanthophyll are accessory pigments, while haemoglobin transports oxygen in blood.
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root hairs
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flowers
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stem
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stomata
D
Correct answer
Explanation
Stomata are tiny pores primarily located on the undersides of leaves that allow gas exchange. Carbon dioxide enters the leaf through these openings to reach the mesophyll cells where photosynthesis occurs. Root hairs absorb water and minerals, while the stem provides structural support and transport.
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Glucose
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Fructose
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Starch
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Fats
C
Correct answer
Explanation
Plants convert glucose produced during photosynthesis into starch for storage in leaves. Starch is insoluble and compact, making it ideal for storage without affecting osmotic pressure. Glucose and fructose are simple sugars used directly for energy or transport.
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Water
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Oxygen
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Carbon dioxide
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None of these
A
Correct answer
Explanation
Water is the only substance that appears in both photosynthesis (as a reactant) and respiration (as a product). In photosynthesis: 6CO2 + 6H2O → glucose + 6O2. In respiration: glucose + 6O2 → 6CO2 + 6H2O. Oxygen is only produced in photosynthesis, CO2 only in respiration.
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chlorophyll a and d
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chlorophyll a and b
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chlorophyll b and c
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chlorophyll a and c
D
Correct answer
Explanation
Brown algae (Phaeophyta) contain chlorophyll a and c, along with fucoxanthin pigment which gives them their characteristic brown color. Chlorophyll b is found in green algae and land plants, while chlorophyll d is found in some cyanobacteria. The distinctive brown color comes from fucoxanthin masking the green chlorophyll.
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All plants prepare their food by photosynthesis.
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Cells containing chloroplast carry out photosynthesis.
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In a green plant, all the organs, tissues and cells prepare their own food.
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Cynobacteria do not carry out photosynthesis.
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The end product of photosynthesis is glucose.
B
Correct answer
Explanation
Yes, it is the correct answer. In green plants, not all the cells, tissues and organs carry out photosynthesis, but only the cells containing chloroplasts that are most often located in the superficial layers, carry out photosynthesis.
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Micrococcus luteus
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Enterococcus faecalis
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Fusobacterium
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Methanococcus
B
Correct answer
Explanation
Enterococcus faecalis is an aerotolerant organism as it only contains peroxidase.
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grana.
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prenoid.
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stroma.
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both grana and stroma.
A
Correct answer
Explanation
A granum (plural grana) is a stack of thylakoid discs.A thylakoid is a membrane-bound compartment inside chloroplasts.They are the site of the light-dependent reactions of photosynthesis. Pyrenoids are sub-cellular micro-compartments found in chloroplasts of many algaeThe stroma of a plant is the region outside of the thylakoid space; most of the enzymes essential in the process of photosynthesis are generally embedded in the stroma and in the thylakoid membranes.