These multiple-choice questions (MCQs) on "Transport in Plants" are designed to help you prepare for competitive exams like NEET. Practice these questions to test your knowledge and understanding of the various mechanisms involved in the transport of water, minerals, and nutrients in plants.
MCQs on Transport in Plants
Absorption of water by roots is increased when:
(a) Transpiration is increased
(b) Transpiration is decreased
(c) Photosynthesis is increased
(d) Photosynthesis is decreased
Ans: Transpiration is increased
Which one of the following will not directly affect transpiration?
(a) Temperature
(b) Light
(c) Wind speed
(d) Chlorophyll content in leaves
Ans: Chlorophyll content in leaves
The pressure at which the entry of water across the semipermeable membrane stops is called:
(a) Turgor pressure
(b) Root pressure
(c) Osmotic pressure
(d) Diffusion pressure
Ans: Osmotic pressure
A force exists between the walls of xylem vessels and water. What is this force called?
(a) Cohesion
(b) Adhesive
(c) Gravitational
(d) Transpirational pull
Ans: Adhesive
The pathway of the movement of water through the cell wall is called:
(a) Symplastic pathway
(b) Apoplastic pathway
(c) Vacuolar pathway
(d) Plasmodesmata pathway
Ans: Apoplastic pathway
In a hypertonic solution, a cell’s water potential:
(a) Decreases
(b) Increases
(c) First increases, then decreases
(d) No change
Ans: Decreases
The element involved in the opening and closing of stomata is:
(a) Chlorine
(b) Sodium
(c) Potassium
(d) Calcium
Ans: Potassium
When a cell is placed in a 0.50 M concentrated sugar solution, there is no change in it. What is the external solution called?
(a) Hypertonic
(b) Hypotonic
(c) Isotonic
(d) Colloidal
Ans: Isotonic
Which of the following changes in the cell sap of the guard cells is responsible for keeping the stomata open during the daytime?
(a) Increase in osmotic pressure but decrease in turgor pressure
(b) Decrease in osmotic pressure but increase in turgor pressure
(c) Increase in both osmotic pressure and turgor pressure
(d) Decrease in both osmotic pressure and turgor pressure
Ans: Decrease in osmotic pressure but increase in turgor pressure
The process of guttation takes place when:
(a) The root pressure is high and the rate of transpiration is low
(b) The root pressure is low and the rate of transpiration is high
(c) The root pressure equals the rate of transpiration
(d) The root pressure as well as the rate of transpiration is high
Ans: The root pressure is high and the rate of transpiration is low
Hydathodes are associated with:
(a) Guttation
(b) Transpiration
(c) Respiration
(d) Transportation
Ans: Guttation
A field is generally watered in sufficient amounts after the application of fertilizers to prevent:
(a) Plasmolysis
(b) Deplasmolysis
(c) Osmosis
(d) Diffusion
Ans: Plasmolysis
The value of osmotic pressure depends on:
(a) Concentration of solute
(b) Concentration of solvent
(c) Concentration of solution
(d) All of the above
Ans: Concentration of solute
Which of the following growth hormones is associated with stomatal movements?
(a) Auxin
(b) Gibberellins
(c) Abscissic acid
(d) Cytokinins
Ans: Abscissic acid
A cell devoid of a cell wall will burst if immersed in:
(a) Hypertonic solution
(b) Hypotonic solution
(c) Isotonic solution
(d) All of the above
Ans: Hypotonic solution
Root pressure is maximum when:
(a) Transpiration is high and absorption is very low
(b) Transpiration is very low and absorption is high
(c) Both transpiration and photosynthesis are very high
(d) Both transpiration and photosynthesis are low
Ans: Transpiration is very low and absorption is high
Ascent of sap is:
(a) Upward movement of organic matter in plants
(b) Downward movement of organic matter in plants
(c) Downward movement of water in plants
(d) Upward movement of water in plants
Ans: Upward movement of water in plants
Which one of the following is not a characteristic of active transport?
(a) Highly selective
(b) Transport solutes
(c) Uphill transport
(d) Insensitive to inhibitors
Ans: Insensitive to inhibitors
Stomatal opening is under the control of:
(a) Epidermal cells
(b) Subsidiary cells
(c) Guard cells
(d) Mesophyll cells
Ans: Guard cells
The element involved in the opening and closing of stomata is:
(a) Chlorine
(b) Sodium
(c) Potassium
(d) Calcium
Ans: Potassium
Wilting in plants occurs when:
(a) Phloem is blocked
(b) Xylem is blocked
(c) Cortical cells are blocked
(d) Pith is removed
Ans: Xylem is blocked
Phloem sap is mainly made of:
(a) Water and sucrose
(b) Water and glucose
(c) Water and starch
(d) Water and fructose
Ans: Water and sucrose
Which of the following statements is not true?
(a) The Apoplastic movement of water occurs exclusively through the cell wall without crossing any membrane
(b) Solute present in any cell increases the free energy of water or water potential
(c) The symplastic pathway occurs from cell to cell through plasmodesmata
(d) Membrane permeability depends on the membrane composition as well as the chemical nature of the solute
Ans: Solute present in any cell increases the free energy of water or water potential
These questions are designed to cover key concepts of plant transport systems, including water and nutrient movement through different parts of the plant. Regular practice of these questions will help you solidify your understanding for NEET and other competitive exams.
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