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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geotropism
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heliotropism
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haptotropism
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hydrotropism
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none of the above
C
Correct answer
Explanation
When the movement of plant organs is stimulated by contact with an object, it is termed as haptotropism.
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lenticel
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hydrathode
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veins
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stoma
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none of these
B
Correct answer
Explanation
During guttation, water is lost through hydrathode.
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siesmonasty
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thigmonasty
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chemotropic
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chemotaxis
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none of these
B
Correct answer
Explanation
The movement exhibited by tentacles of Drosera is thigmonasty.
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opening of stomata
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absorption of water by roots
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excretion of minerals
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electrolyte balance
B
Correct answer
Explanation
Transpiration is the major mechanism that derives the movement of water through a plant. It is described as the engine that pulls water up from the roots to leaves.
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evaporation from the leaves
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root pressure
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active transport
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osmosis
A
Correct answer
Explanation
It is the correct option. Evaporation of water from the leaves generates tension which transmits water up the trunk.
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upward in the xylem
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upward in the phloem
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both upward & downward in the phloem
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both upward & downward in the xylem
C
Correct answer
Explanation
This is the correct answer as sugars are transported in both the directions.
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stomatal
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culticular
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lenticular
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foliar
A
Correct answer
Explanation
Most of the transpiration from plant parts takes place through minute openings called stomata.
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stem
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leaves
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roots
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flowers and fruits
B
Correct answer
Explanation
Maximum transpiration takes place from the surface of leaves as they possess maximum number of stomata.
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Open stomata, high humid atmosphere and well irrigated soil
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Open stomata, high humidity in atmosphere and dry soil
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Open stomata, dry atmosphere and moist soil
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Closed stomata, dry atmosphere and dry soil
C
Correct answer
Explanation
Rate of transpiration will be maximum, if the stomatal pores are open, atmosphere is dry and soil is moist.
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water vapours only
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water vapours and CO2
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CO2 only
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N2 and CO2
B
Correct answer
Explanation
Exchange of gas (CO2) and water is regulated by the opening and closing of stomata.
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evaporation
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guttation
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transpiration
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bleeding
C
Correct answer
Explanation
Transpiration can be defined as the process of loss of water from the surface of exposed aerial parts of water. It helps to translocate water and minerals and also provides cooling effect to plants during summers.
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When the atmosphere is less saturated.
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When suction of salt molecules by adjacent guard cells takes place.
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When water molecules enter the guard cells.
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When the night temperature falls.
C
Correct answer
Explanation
The widening of stomatal pores is due to the presence of water content in excess in a plant.
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pure water
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rich in dissolved salts
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rich in dissolved minerals
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rich in solutes
A
Correct answer
Explanation
Water lost in transpiration is pure water. It does not contain any solute particles (minerals and salts).
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Transpiration is partly physical and partly physiological process.
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Transpiration is influenced by only environmental conditions.
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Transpiration depends upon absorption of water and does not use energy.
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Transpiration is a rapid biological process.
A
Correct answer
Explanation
Transpiration is partly physical and partly physiological process.
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Leaves with both surfaces ungreased
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Leaves with both surfaces greased
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Leaves with upper surface greased
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Leaves with lower surface greased
B
Correct answer
Explanation
Maximum transpiration takes place from the lower surface of the leaves. If this portion is greased, the loss of water taking place from the plant will be very less.