imbibition is a type of diffusion in which water is absorbed by solids or colloids which leads to increase in volume. This happens in case of dry wood and seeds
Q2. Choose the correct statement/statements. Pumps in active transport are A. Lipids that bind molecules to pass them through the membrane. B. Transport molecules uphill. C. These are specific transporters. D. These are sensitive to inhibitors
A) A and C
B) A, B and D
C) B, C and D
D) C and D
Answer: (C) B, C and D
Pumps in active transport are proteins that bind molecules to pass them through the membrane
Q3. Which of the following is the unit of ψ?
A) Pascal
B) Joule
C) Newton
D) Electron volt
Answer: (A) Pascal
Psi or ψ is expressed in pressure units e.g. pascals
Q4. Two cells A and B are contiguous. Cell A has osmotic pressure 10 atm, turgor pressure 7 atm and diffusion pressure deficit 3 atm. Cell B has osmotic pressure 8 atm, turgor pressure 3 atm and diffusion pressure deficit 5 atm. The result will be
A) No movement of water
B) Movement of water from cell B to A
C) Movement of water from cell A to B
D) Equilibrium between the two
Answer: (C) Movement of water from cell A to B
Movement of water from cell A to B
Q5. Which of the following is decreased during increase in humidity in the atmosphere?
A) Transpiration
B) Photosynthesis
C) Respiration
D) Glycolysis
Answer: (A) Transpiration
With the increase in humidity in atmosphere, rate of transpiration decreases
Q6. Ψs is always
A) positive
B) zero
C) negative
D) one
Answer: (C) negative
Ψs is always negative
Q7. Two types of molecules cross the membrane in the same direction, it is called as
A) Uniport
B) Symport
C) Antiport
D) Multiport
Answer: (B) Symport
In symport, two types of molecules cross the membrane in the same direction
Q8. Diffusion rate is affected by
A) temperature
B) membrane permeability
C) gradient of concentration
D) all of these
Answer: (D) all of these
Diffusion rate is affected by the gradient of concentration, permeability of the membrane separating them, temperature and pressure
Q9. Cells shrink in _________ solution
A) isotonic
B) hypotonic
C) hypertonic
D) hypotonic and hypertonic
Answer: (C) hypertonic
In hypertonic solution, external solution is more concentrated as compared to cytoplasm.Cells shrink in hypertonic solutions
Q10. Which of the following is true about diffusion?
A) There is no expenditure of energy
B) Molecules move in Brownian motion
C) Substances moves from the region of higher concentration to the region of lower concentration.
D) Diffusion depends on the type of living system
Answer: (D) Diffusion depends on the type of living system
Diffusion is a slow process, it is not dependent on the living systems
Q11. Which of the following is true about diffusion?
A) There is no expenditure of energy
B) Molecules move in Brownian motion
C) Substances moves from the region of higher concentration to the region of lower concentration
D) Diffusion depends on the type of living system
Answer: (D) Diffusion depends on the type of living system
Diffusion is a slow process, it is not dependent on the living systems.
Q12. Water is lost in a liquid state in some plants through hydathodes. These hydathodes
A) do not show any specificity in opening and closing
B) remain closed during day
C) remain closed at night
D) remain always open
Answer: (D) remain always open
remain always open
Q13. If pressure greater than atmospheric pressure is applied to pure water, the water potential
A) increases
B) decreases
C) remains same
D) atmospheric pressure does not affect water potential
Answer: (A) increases
If a pressure greater than atmospheric pressure is applied to pure water, the water potential increases.
Q14. Choose the correct sequence of water movement in the plants.
A) Cortex, protoxylem, endodermis, root hair, pericycle, metaxylem
B) Root hair, cortex, endodermis, pericycle, protoxylem, metaxylem
C) Root hair, protoxylem, metaxylem, pericycle, cortex, endodermis
Water is absorbed from soil by root hair. This is then carried by cortex,then passed to endodermis.Endodermis passes water to Perivale then to protoxylem and metaxylem
Q15. Wilting of a plant results from excessive
A) respiration
B) photosynthesis
C) absorption
D) transpiration
Answer: (D) transpiration
Q16. Cohesion theory of water movement in plants was put forth by
A) Henry Dixon
B) F. F. Blackman
C) Melvin cycle
D) Hans. A. Krebs
Answer: (A) Henry Dixon
Q17. Diffusion rate is affected by
A) temperature
B) membrane permeability
C) gradient of concentration
D) all of these
Answer: (D) all of these
Diffusion rate is affected by the gradient of concentration, permeability of the membrane separating them, temperature and pressure
Q18. When a plant is girdled (ringed)
A) the root and shoot die at the same time
B) the shoot dies first
C) the root dies first
D) neither root nor shoot will die
Answer: (C) the root dies first
the root dies first
Q19. Choose the correct statement/statements. Pumps in active transport are A. Lipids that bind molecules to pass them through the membrane. B. Transport molecules uphill. C. These are specific transporters. D. These are sensitive to inhibitors
A) A and C
B) A, B and D
C) B, C and D
D) C and D
Answer: (C) B, C and D
Pumps in active transport are proteins that bind molecules to pass them through the membrane.
Q20. Assertion (A): K+ ion accumulation found in Nitella depends on its respiratory activity. Reason (R)Absorption of all ions in plants completely depends on the usage of metabolic energy. The correct answer is
A) A and R are true and R is the correct explanation of A
B) A and R are true but R is not the correct explanation of A
C) A is true but R is false
D) A is false but R is true
Answer: (C) A is true but R is false
Q21. Root hairs absorb water from soil with the help of
A) Root pressure
B) osmotic pressure
C) Suction pressure
D) Turger pressure
Answer: (B) osmotic pressure
Q22. Proteins that form huge pores in the membrane of the certain organelles and bacteria are called as
A) Porins
B) Pressure gradient
C) Enzymes
D) Flaccid
Answer: (A) Porins
Porins
Q23. What is the effect of turgor pressure in Munch hypothesis?
A) Increase of turgor pressure
B) Decrease of turgor pressure
C) No change in turgor pressure
D) independent to water potential gradient
Answer: (A) Increase of turgor pressure
Increase of turgor pressure
Q24. Munch hypothesis is based on
A) Translocation of food due to turgor pressure gradient and imbibition force
B) Translocation of food due to turgor pressure gradient
C) Translocation of food due to imbibition force
D) None of the above
Answer: (B) Translocation of food due to turgor pressure gradient
Translocation of food due to turgor pressure gradient
Q25. ψp denotes to
A) Water potential
B) Negative potential
C) Pressure potential
D) Solute potential
Answer: (C) Pressure potential
Pressure potential
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