Biology
Plant Transport and Physiology
1,834 Questions
Access a comprehensive set of questions on plant transport mechanisms and physiological adaptations. Topics include water movement, translocation of food, and plant responses to external stimuli. These biology questions are essential for medical entrance exams and other science competitive tests.
Xylem and phloem transportTranspiration and evaporationPlant adaptationsGeotropic and phototropic responsesWater absorption by rootsRespiration in roots
Plant Transport and Physiology Questions
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Roots absorb water and mineral salts.
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Raw sap travels to the leaves through xylem vessels.
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Stomata take in carbon dioxide.
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Elaborated sap travels to all parts through pholem vessels
A
Correct answer
Explanation
During the day, the rate of photosynthesis is much higher than the rate of cellular respiration. Consequently, plants produce and release far more oxygen into the atmosphere than they consume for their own respiration.
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xylem vessels
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stomata
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pholem vessels
C
Correct answer
Explanation
Elaborated sap, which consists of water and synthesized organic nutrients like sucrose, is distributed throughout the plant via phloem vessels. Xylem vessels transport raw sap (water and minerals), while stomata are pores for gas exchange.
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...their own food using sunlight
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...transported inside plants
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...through photosynthesis
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...is called raw sap
D
Correct answer
Explanation
Raw sap is the term used for the inorganic solution of water and mineral salts absorbed by plant roots from the soil before it undergoes photosynthesis.
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...their own food using sunlight
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...transported inside plants
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...from the soil and from air
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...and release carbon dioxide
A
Correct answer
Explanation
Plants are autotrophic organisms, meaning they produce their own food (sugars) using light energy from the sun during photosynthesis.
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...their own food using sunlight
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...transported inside plants
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...from the soil and from air
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...and release carbon dioxide
C
Correct answer
Explanation
Plants absorb water and mineral salts from the soil through their roots, and they take in gases like carbon dioxide and oxygen from the air through their leaves.
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light
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temperatures
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water
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air
B
Correct answer
Explanation
While plants require light, water, and air, most plant species thrive best in mild temperatures. Extreme heat or freezing cold can disrupt their metabolic processes and damage their tissues.
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light, water, air and mineral salts
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light, soil, air and mineral salts
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light, water, soil and mineral salts
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soil, water, air and mineral salts
A
Correct answer
Explanation
Photosynthesis requires light energy, water, carbon dioxide (from the air), and mineral salts. Soil itself is not strictly necessary as long as the plant has access to water and dissolved minerals, as demonstrated in hydroponics.
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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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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.
A
Correct answer
Explanation
Many legumes export fixed nitrogen from root nodules to the rest of the plant via the xylem in the form of ureides (such as allantoin and allantoic acid), which are also nitrogen-rich compounds.
A
Correct answer
Explanation
Mineral salts are absorbed by roots and translocated to other parts of the plant through the xylem vessels.
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In Apoplast water absorption is passive
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In symplast water absorption is active
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Both
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None
A
Correct answer
Explanation
The critical concentration is defined as the concentration of an essential element in plant tissue below which the growth of the plant is retarded. This is a standard concept in plant mineral nutrition.