Biology
Photosynthesis in Plants
1,508 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
D
Correct answer
Explanation
Leaves appear green because of chlorophyll, the primary light-absorbing pigment found in chloroplasts of plant cells. Chlorophyll absorbs red and blue light while reflecting green light.
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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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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.
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Stomata
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Chlorophyll
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Starch
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Mitocondria
B
Correct answer
Explanation
Chlorophyll is the green pigment found in plants that is essential for photosynthesis. Option B is correct.
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Stomata
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Chlorophyll
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Tendrils
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Starch
B
Correct answer
Explanation
Chlorophyll is the green pigment found in plants, algae, and cyanobacteria. It is essential for photosynthesis as it absorbs light energy (mostly in the blue and red spectrum) and converts it into chemical energy. Stomata are pores for gas exchange, tendrils are climbing organs, and starch is a carbohydrate storage product.
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Carbon Dioxide
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Oxygen
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Nitrogen
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Hydrogen
A
Correct answer
Explanation
During photosynthesis, plants take in carbon dioxide through stomata to synthesize glucose. The carbon atoms from CO2 form the backbone of carbohydrates while oxygen is released as waste.