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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Tendrils
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Stomata
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Starch
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Chlorophyll
D
Correct answer
Explanation
Chlorophyll is the green pigment in plants that absorbs light for photosynthesis. Tendrils are climbing organs, stomata are pores for gas exchange, and starch is a carbohydrate storage product.
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Carotene
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Xanthophyll
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Mitochondria
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Chlorophyll
D
Correct answer
Explanation
Chlorophyll is the primary green pigment found in plants, responsible for absorbing light energy during photosynthesis. While carotene and xanthophyll are also plant pigments, they appear orange and yellow respectively, not green. Mitochondria are organelles involved in energy production, not pigments.
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Carotene
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Chlorophyll
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Mitochondria
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Xanthophyll
B
Correct answer
Explanation
Leafy vegetables get their green color from chlorophyll, the pigment responsible for photosynthesis. Carotene provides orange pigment, mitochondria are organelles, and xanthophylls are yellow pigments.
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Lysosome
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Leucoplast
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Chromoplast
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Chloroplast
D
Correct answer
Explanation
Chloroplasts contain chlorophyll, the green pigment that gives plants their characteristic color and enables photosynthesis. This is why plants appear green.
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Chromoplast
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Chloroplast
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Leucoplast
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Chrolophyll
A
Correct answer
Explanation
Chromoplasts are plastids that contain pigments giving color to plant parts like fruits, flowers, and aging leaves. They synthesize and store pigments such as carotenoids (red, orange, yellow). Chloroplasts contain chlorophyll for photosynthesis (green), leucoplasts store colorless starch/proteins, and chrolophyll is a misspelling of chlorophyll.
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green pigment
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hemoglobin pigment
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brown pigment
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chlorophill pigment
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Bright sun light
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Photosynthesis
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Algae and Plankton
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Respiration
A,B,C
Correct answer
Explanation
Corals are marine invertebrates that require sunlight for photosynthesis (provided by zooxanthellae algae), which is essential for their growth. They also need plankton as a food source. Bright sunlight is crucial for the photosynthetic process. Respiration is a biological process, not a growth requirement specific to corals.
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Matrix of chloroplast
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Matrix of mitochondrion
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Inner membrane of mito-
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Grana of chloroplast
C
Correct answer
Explanation
Oxidative phosphorylation occurs in the inner mitochondrial membrane where the electron transport chain is located. The proton gradient across this membrane drives ATP synthesis via ATP synthase. The matrix contains TCA cycle enzymes, and chloroplast structures are involved in photosynthesis, not respiration. Note: 'mito-' in option C is an abbreviation for mitochondrion.
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Water
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Chlorophyll
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Carbon Di-Oxide
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Oxygen
D
Correct answer
Explanation
Oxygenic photosynthesis uses water, carbon dioxide, and light energy to produce glucose and oxygen. The oxygen released comes from the splitting of water molecules during the light-dependent reactions, not from carbon dioxide. This process occurs in plants, algae, and cyanobacteria. Water is consumed, not produced; chlorophyll is a pigment that absorbs light, not a byproduct.
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carbon
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sulphur
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auxin
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oxygen
C
Correct answer
Explanation
Auxin is a plant hormone responsible for phototropism - the movement of plants toward light. When light hits one side of a plant, auxin redistributes to the shaded side, causing cells on that side to elongate more and bend the stem toward the light source. Charles Darwin first observed this phenomenon.
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Acid Rain
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Photosynthesis
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Stomata
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Carbon and Oxygen cycle
A
Correct answer
Explanation
Acid rain is an environmental phenomenon caused by pollution, while photosynthesis, stomata, and carbon/oxygen cycles are all biological processes related to plants. Acid rain is the odd one out as it's harmful rather than a natural biological function.
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Pheophytin
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Xanthophyll
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Chlorophyll
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Carotene
C
Correct answer
Explanation
Chlorophyll is the primary green pigment responsible for photosynthesis in plants, absorbing light in the blue and red parts of the spectrum while reflecting green light. Carotene and xanthophyll are carotenoids that produce yellow-orange colors, while pheophytin is a degradation product of chlorophyll that lacks its characteristic green color.
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Hydrotropism
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chemotropism
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Phototropism
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Thigmotropism
C
Correct answer
Explanation
Phototropism is the growth response of plants to light, where plants grow toward light sources (positive phototropism) as seen in shoots bending toward sunlight. The prefix 'photo-' relates to light.
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an exothermic process
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an endothermic process
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a neutral process
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a thermostatic process
B
Correct answer
Explanation
Photosynthesis is an endothermic (energy-absorbing) process because it requires energy input from sunlight to convert carbon dioxide and water into glucose and oxygen. The process stores energy in chemical bonds, which is why it's considered endothermic.
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Respositary
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Photosynthesis
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Absorb Water
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InTake
B
Correct answer
Explanation
Photosynthesis is the process by which plants use sunlight, carbon dioxide, and water to produce glucose (food) and oxygen. This occurs in chloroplasts containing chlorophyll, which captures light energy.