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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osmosis
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diffusion
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plasmolysis
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imbibition
B
Correct answer
Explanation
Unicellular organisms rely on simple physical processes to exchange materials with their environment. Diffusion allows gases and small molecules to move across the cell membrane along a concentration gradient.
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They have a waxy coating on leaves.
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Leaves are modified into spines.
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Photosynthesis occurs in the leaves.
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None of these
C
Correct answer
Explanation
Photosynthesis occurs in stems of the desert plants. They increase in size and become spongy to carry out the process of photosynthesis.
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Diffusion Pressure Deficit + Turgor Pressure
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Diffusion Pressure Deficit - Turgor Pressure
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Turgor Pressure - Diffusion Pressure Deficit
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Turgor Pressure - Diffusion Pressure
A
Correct answer
Explanation
In a plant cell, OP is equal to Diffusion Pressure Deficit + Turgor Pressure.
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osmosis
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imbibition
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bad quality of wood
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poor workmanship
B
Correct answer
Explanation
During rainy season doors made up of wood generally swell up, due to diminution which means when wood come in contact with water or exposure to moist air, it swells up.
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It is higher than air
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It becomes higher when K+ ions are actively moved into the cell
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It is equal to zero when the cell is in pure water and turgid
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It becomes lower after the uptake of water by osmosis
C
Correct answer
Explanation
Water potential is equal to zero when the cell is in pure water and turgid
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Water and inorganic salts are taken simultaneously by root hairs
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Plants take in small quantity of mineral salts through soil water
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Roots are the main absorbing organs of plants
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Plants absorb only one thing at a time, water or inorganic salts
D
Correct answer
Explanation
Option (4) is incorrect option as plants aborb both water and minerals at the same time.
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accumulation of inorganic salts in the cells
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accumulation of organic compounds in the cells
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chemical potential gradient
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water potential gradient
D
Correct answer
Explanation
The movement of water from one cell of the cortex to adjacent one, in the roots, is due to the water potential gradient.
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xylem vessel system
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sieve tubes members of phloem
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xylems and phloem
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sieve cells of phloem
A
Correct answer
Explanation
Translocation is movement of material from leaves to other issues throughout the plant. Tissue in which nutrient move is phloem. Translocation in angiosperm(flouring plant) is approximate 1 meter per hour & the pathway by which water is translocated in angiosperms is called xylem vessel system.
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hygroscopic water
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capillary water
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gravitation water
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colloid water
B
Correct answer
Explanation
In soil, water available to the plants' root is capillary water.
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leaves remain fresh, but ascent of sap stops
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phloem gets colored because of ascent of sap
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xylem elements get stained showing ascent of sap
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ascent of sap stops
C
Correct answer
Explanation
If the cut end of tree is put in eosin solution then the water will come in upward movement from root to aerial parts of the plant body and this is called translocation of water or as cent of rap & xylem .
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absorption
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imbibition
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osmosis
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respiration
B
Correct answer
Explanation
The initial stage of water absorption by root cells is by imbibition.
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Phloem
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Xylem
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Epidermis
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Cambium
B
Correct answer
Explanation
Xylem is connected with transport of water in plants.The most distinctive xylem cells are the long tracheary elements that transport water.
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the presence of gases inside the leaves
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their genetic constitution
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turgor pressure of guard cells
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turgor pressure of subsidiary cells
C
Correct answer
Explanation
The stomata in angiosperms open and close due to turgor pressure of guard cells.
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root hairs into cortical cells
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pericyle cells into tracheal elements
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cortical cells into the pericycle
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soil into root hairs
D
Correct answer
Explanation
The permeability of a cell wall can be best deduced from the passage of water and mineral salts from soil into root hairs.
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transpiration is low
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exosmosis occurs
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no bacterial growth takes place
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absorption of solute, inside flower cell takes place.
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-
B
Correct answer
Explanation
In this the solution is hypertonic and the flower cell is hypotonic. Water will leave the flower cell, hence exosmosis will occur.