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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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.
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C6H12O6 + 6O2 = 6CO2 + 6H2O + energy
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C4H12O6 + O2 = 4CO2 + 6H2 + energy
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C6H6O6 + 3O2 = 6CO2 + 3H2 + energy
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None
A
Correct answer
Explanation
The equation shows the breakdown of glucose during cellular respiration, which is essentially the reverse of photosynthesis. C6H12O6 (glucose) + 6O2 produces 6CO2 + 6H2O + energy, representing the oxidative process that releases stored energy.
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chlorophyll
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atmosphere
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light
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soil
D
Correct answer
Explanation
Plants absorb water and dissolved minerals (nitrogen, phosphorus, potassium, etc.) from soil through their roots. While atmospheric CO2 provides carbon and light provides energy for photosynthesis, soil is the primary source of essential nutrients required for growth and development.
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Leaf and other chloroplast bearing plants
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steam and leaf
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Roots and chloroplast bearing plants
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Bark and leaf
A
Correct answer
Explanation
Photosynthesis occurs primarily in leaves and other chloroplast-containing parts of plants because chloroplasts contain chlorophyll, which captures light energy. Options B and C contain stems/roots which lack chloroplasts or have minimal photosynthetic capacity. Option D includes bark which does not photosynthesize.
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Sclerenchyma
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Parenchyma
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Collenchyma
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Chlorenchyma
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Aerenchyma
D
Correct answer
Explanation
Yes, it consists of chlorophyll, which is used in photosynthesis.
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Xyanthophyll
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Carotene
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Lucoplasts
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Anthocyanin
C
Correct answer
Explanation
They are colourless plastids. They do not have pigments. They only store starch in the plant cell.
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isolated system
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closed system
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open system
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adiabatic system
C
Correct answer
Explanation
This system exchange both matter and energy with the surroundings. Since plant exchanges both matter and energy with the surroundings, photosynthesis is an example of open system.
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chlorophyta
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euglenophyta
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phaeophyta
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rhodophyta
D
Correct answer
Explanation
This phylum of the kingdom protista contains photosynthetic organisms commonly known as red algae. Members of this division have a peculiar clear red colour imparted by accessory pigments called phycobilins. They are multicellular and are characterized by a great deal of branching.
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Roots of the plants.
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Green parts of the plants.
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Seeds of the plants.
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Fruit of plant.
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All parts of the plants.
B
Correct answer
Explanation
Photosynthesis is the biochemical process in which light energy is absorbed by chlorophyll and used to build sugar from carbon dioxide and water, releasing oxygen. The process occurs in green parts of the plant mostly leaves.
In some plants stem may be modified hebaceous to perform photosynthesis.
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All chloroplasts have at least three membrane systems.
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Many chloroplast DNAs contain numerous inverted repeats.
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Cyanobacteria are considered the ancestors of chloroplasts.
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In land plants, chloroplasts are generally lens-shaped.
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The inner chloroplast membrane regulates the passage of material.
B
Correct answer
Explanation
Many chloroplast DNAs contain two inverted repeats, which separate a long single copy section (LSC) from a short single copy section (SSC). While a given pair of inverted repeats is rarely completely identical, they are always very similar to each other, apparently resulting from concerted evolution.
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Chlorophyll a
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Chlorophyll b
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Chlorophyll c
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Chlorophyll d
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Chlorophyll f
B
Correct answer
Explanation
Chlorophyll b is an olive green pigment found only in the chloroplasts of plants, green algae, any secondary chloroplasts obtained through the secondary endosymbiosis of a green alga, and a few cyanobacteria. It is the chlorophylls a and b together that make most plant and green algal chloroplasts green.
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Chromoplasts
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Gerontoplast
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Leucoplasts
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Amyloplasts
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Elaioplasts
B
Correct answer
Explanation
A gerontoplast is a plastid found in formerly green tissues that are currently senescing. A gerontoplast is a chloroplast that has re-purposed through a process of developmental senescence.
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necrosis
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chlorosis
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phototropism
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vernalization
B
Correct answer
Explanation
When plants are deprived of light, they cannot produce chlorophyll, which gives them their green color. This yellowing condition due to chlorophyll deficiency is called chlorosis. Necrosis refers to tissue death, phototropism is growth toward light, and vernalization is cold treatment.