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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through the leaves
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through the roots
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through the stem
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plants do not absorb water
B
Correct answer
Explanation
Plants absorb water from the soil through their root systems, which is then transported to the leaves for photosynthesis.
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it is used to split water molecules into hydrogen & oxygen
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it is used to absorb oxygen from animals
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it is used to keep the plant green
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the Sun's energy is not absorbed by the chlorophyll
A
Correct answer
Explanation
During the light-dependent reactions of photosynthesis, chlorophyll absorbs solar energy, which is used to split water molecules into oxygen and hydrogen.
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by providing carbon dioxide for animal cells
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by providing food & oxygen from photosynthetic organisms
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by helping the water cycle flow through organisms
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photosynthesis does not help in this process.
B
Correct answer
Explanation
Photosynthesis produces glucose (food) and releases oxygen, both of which are essential for the survival of most other living organisms.
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chlorophyll
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carotenoids
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flavenoids
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betalains
A
Correct answer
Explanation
Chlorophyll is the primary pigment in chloroplasts that absorbs light energy for photosynthesis. Other pigments like carotenoids and flavonoids serve accessory roles or provide color, but chlorophyll is the main light-harvesting molecule.
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animals exhaling
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plant waste
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wildfires
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volcanic activity
B
Correct answer
Explanation
Carbon dioxide is released into the atmosphere by respiration, combustion, and volcanic activity. Plant waste, such as fallen leaves, is typically decomposed by microorganisms, which releases nutrients back into the soil rather than being a primary source of atmospheric carbon dioxide for photosynthesis.
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through small holes in the leaves (stomata)
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it is absorbed through the roots
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sunlight converts to carbon dioxide in the leaves
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it is absorbed through rain/water
A
Correct answer
Explanation
Stomata are tiny pores on the surface of leaves that allow for gas exchange. Carbon dioxide enters the leaf through these openings, while oxygen and water vapor exit.
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They inhale the carbon dioxide that gets released.
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They drink the water used in the process.
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They inhale the oxygen that became a waste product.
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They use nutrients in the carbon dioxide for planting food.
C
Correct answer
Explanation
Photosynthesis produces oxygen as a byproduct, which is released into the atmosphere. Animals rely on this oxygen for cellular respiration to survive.
B
Correct answer
Explanation
Photosynthesis is the foundational process for most life on Earth. It converts solar energy into chemical energy stored in glucose and cycles carbon and oxygen through the biosphere.
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nitrogen
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oxygen
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carbon dioxide
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water
A
Correct answer
Explanation
Chlorine (Cl) is essential for the water-splitting reaction in photosynthesis, which releases oxygen. It works in conjunction with manganese.
C
Correct answer
Explanation
Manganese (Mn) is the primary element required for the photolysis of water during the light-dependent reactions of photosynthesis.
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Activates the enzymes of respiration and photosynthesis
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Involves in synthesis of DNA & RNA
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Constituent of the ring structure of chlorophyll
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All
D
Correct answer
Explanation
Magnesium (Mg) activates enzymes for respiration and photosynthesis, is involved in DNA and RNA synthesis, and is the central atom in the chlorophyll molecule.
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Zn is an activator of Alcohol dehydrogenase
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Mo is an activator of Nitrogenase
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K plays role in opening and Closing of stomata
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All
D
Correct answer
Explanation
Zinc activates alcohol dehydrogenase, molybdenum activates nitrogenase, and potassium is involved in stomatal regulation. All these statements are correct.
A
Correct answer
Explanation
C4 plants are significantly more efficient at carbon fixation, especially in hot and dry conditions, because they minimize photorespiration.
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No & distribution of stomata
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% of open stomata
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Water status of the plant & canopy structure
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All
D
Correct answer
Explanation
Transpiration is influenced by multiple plant factors, including the number and distribution of stomata, the percentage of open stomata, the plant's water status, and the overall canopy structure.