CBSE Class 11 Biology Transport In Plants MCQs

Question : The movement of mineral ions into plant root cells as a result of diffusion is called
a) passive absorption
b) active absorption
c) osmosis
d) endocytosis
Answer : A

Question : In soil, the water available for root absorption is
a) capillary water
b) combined water
c) gravitational water
d) hygroscopic water
Answer : A

Question : Plasmolysis occurs when the cell is placed in
a) hypertonic solution
b) isotonic solution
c) hypotonic solution
d) None of the above
Answer : A

Question : The rate of transpiration in plants is dependent upon
a) light, temperature, atmospheric humidity and wind
b) wind, temperature and light
c) light and temperature
d) temperature and soil
Answer : A

Question : The water potential and osmotic potential of pure water are
a) zero and zero
b) 100 and zero
c) 100 and 100
d) None of these
Answer : A

Question : Stomata open and close due to
a) turgor pressure of guard cells
b) pressure of gases inside the leaves
c) genetic clock
d) ircadian rhythm
Answer : B

Question : Movement of ions or molecules in a direction opposite to that of prevailing electrochemical gradient is known as
a) active transport
b) brownian movement
c) diffusion
d) pinocytosis
Answer : A

Question : Osmosis means movement of
a) solvent from low concentration of solution to higher concentration of solution.
b) solvent from higher concentration of solution to low concentration of solution.
c) solute from higher concentration to lower concentration.
d) None of these
Answer : A

Question : Solution outside a cell has higher concentration than cytoplasm, then the solution is
a) hypertonic
b) acidic
c) isotonic
d) hypotonic
Answer : A

Question : Which of the following is used as antitranspirant?
a) Phenyl mercuric acetate
b) Cobalt chloride
c) Naphthol acetic acid
d) Calcium carbonate
Answer : A

Question : In rainy season, door gets swelled due to
a) imbibition
b) transpiration
c) diffusion
d) respiration
Answer : B

Question : Turgor pressure become equal to the wall pressure when
a) no exchange of water takes place
b) solute goes from cell into water
c) water enter the cell
d) water leaves the cell
Answer : A

Question : Addition of a solute to pure water causes
a) negative water potential
b) more negative water potential
c) positive water potential
d) more positive water potential.
Answer : A

Question : Which one of the following process help the water- soluble inorganic nutrients go down into the soil horizon and get precipitated as unavailable salts?
a) Leaching
b) Fragmentation
c) Catabolism
d) None of these
Answer : A

Question : Water logging of soil makes it physiologically dry because
a) this condition does not allow oxygen to enter the soil
b) this condition does not allow the capillary force to work
c) Both
d) None of the above
Answer : A

Question : The phenomenon of plasmolysis is evident when cells are kept in
a) hypertonic solution
b) isotonic solution
c) None of the above
d) hypotonic solution
Answer : A

Question : The casparian strip prevents water and minerals from entering the stele through the
a) apoplast
b) xylem vessel
c) plasmodesmata
d) symplast
Answer : A

Question : If a soft stemmed plant, is cut horizontally near the base of its stem with a sharp blade on early morning of a humid day, drops of solution ooze through cut stem. This is due to
a) root pressure
b) bleeding
c) guttation
d) transpiration pull
Answer : A

Question : The movement of water up the stems of tall plants is least dependent on which of the following factors ?
a) Guttation
b) Transpiration
c) Cohesiveness of water molecules
d) Tension within column of water molecules
Answer : A

Question : The primary difference between the apoplast and the symplast is that the
a) apoplast is nonliving spaces and cell walls
b) apoplast relies on active transport.
c) symplast is nonliving spaces and cell walls
d) apoplast prevents passive diffusion
Answer : A

Question : Tension is a result of which of the following?
a) Transpiration at the leaf surface
b) The cohesive nature of water
c) The narrowness of the xylem tube
d) All of the above
Answer : A