Biology
Plant Transport and Physiology
2,012 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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Lenticles
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Cuticle
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Stomata
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Rhizoids
C
Correct answer
Explanation
From stomata, maximum loss of water through transpiration take place.Transpiration is essentially evaporation of water from plant leaves.
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Translocation of minerals
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Excretion of sap
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Ascent of sap
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Cooling
B
Correct answer
Explanation
Excretion of sap is not a function of transpiration. Rest all options are its functions.
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Parenchyma
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Cambium
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Phloem
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Xylem
C
Correct answer
Explanation
Phloem helps in the bidirectional translocation of minerals.It consists of: conducting cells, generally called sieve elements; parenchyma cells, including both specialized companion cells or albuminous cells and unspecialized cells; and supportive cells, such as fibres and sclereids.
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To reduce transpiration
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To prevent guttation
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To enhance gaseous exchange
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To prevent gaseous exchange
A
Correct answer
Explanation
The function of hairs present on the leaf surface is to reduce transpiration.They are also known as Trichomes.
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Because of bordered pits
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Because of no end wall
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Because of broader lumen and perforated cross walls
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Because of bordered pits and without protoplasm
C
Correct answer
Explanation
Sieve tubes are suited for translocation of food because of broader lumen and perforated cross walls.
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It helps in the absorption of minerals.
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It helps to regulate temperature.
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It is a major driving force in movement of water in xylem.
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All of the above
D
Correct answer
Explanation
Transpiration is important for a plant because it helps in the absorption of minerals, regulation of temperature and is the major driving force in movement of water in xylem.
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evaporation
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guttation
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transpiration
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None of these
C
Correct answer
Explanation
Loss of water in the form of vapour through stomata is called transpiration.
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Sunken stomata
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Hairy leaves
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A thick cuticle
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Flattened stems
D
Correct answer
Explanation
Flattened stems in a plant don't restrict transpiration.
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phloem
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xylem
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leaves
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parenchyma
B
Correct answer
Explanation
Water in the plants is transported by the tissue called xylem.
D
Correct answer
Explanation
K+ ions controls the stomatal movement in plants. Basically Opening and closure of the stomatal pore is mediated by changes in the turgor pressure of the two guard cells.
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Root hair
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Stomata
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Xylem
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Epidermis
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Phloem
B
Correct answer
Explanation
Opening of stomata on leaves permits transpiration by plants.
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Phloem
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Epidermis
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Cortex
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Xylem
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Hypodermis
D
Correct answer
Explanation
Xylem vessels transport water and minerals.
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imbibition
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cyclosis
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putrefaction
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diffusion
D
Correct answer
Explanation
The only means of gaseous movement within a plant body is by diffusion.
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The low rate of transpiration will lead the plant to die.
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Without transpiration, the plant won't be able to photosynthesise.
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Without transpiration, plant cannot uptake water and nutrients from the soil.
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Its absence adversly affects overall funtioning of plants.
D
Correct answer
Explanation
Transpiration creates negative pressure in adjacent subsidiary cells of the stomata, which get transferred down the xylem, which results in uptake of the water and nutrients from the soil which is ultimately utilised in the process of photosynthesis. Thus, its absence can affect overall functioning of plants.
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cyclosis
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putrefaction
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diffusion
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imbibition
C
Correct answer
Explanation
The only means of gaseous movement within the plant body is diffusion. Diffusion is the movement of particles of different substances including the gaseous particles from the region of higher concentration to the region of lower concentration.