Transport in Plants is a Class 11 Biology chapter that carries about 2.0% of the Biology questions in NEET. Practise it with 63 questions covering 4 topics, each with an explanation.
Sample questions on Transport in Plants with answers
8 questions from the practice bank, spread across the chapter's topics. The full set is in the app.
Question 1: Means of Transport: Diffusion and Active Transport
The carrier proteins which allow the movement of two molecules in the same direction are called:
- A porins
- B antiport
- C uniport
- D symport
Answer: D. symport
Why: The antiport moves the two molecules in the opposite directions.
Question 2: Phloem Transport and the Pressure Flow Hypothesis
Girdling experiments, in which a ring of bark is removed from a stem, show that the:
- A the food moves through the xylem
- B food moves through the phloem, as the sugar accumulates above the ring
- C the water moves through the phloem
- D the roots absorb the food
Answer: B. food moves through the phloem, as the sugar accumulates above the ring
Why: The bark contains the phloem.
Question 3: Transpiration and the Ascent of Sap
The inner wall of the guard cell, toward the stomatal pore, is:
- A absent
- B thin
- C porous
- D thick and elastic
Answer: D. thick and elastic
Why: The orientation of the microfibrils helps the opening.
Question 4: Water Potential and Osmosis
The pressure potential of a flaccid cell is:
- A one
- B negative
- C positive
- D zero
Answer: D. zero
Why: The cell is not turgid.
Question 5: Means of Transport: Diffusion and Active Transport
Water channels are made up of eight different types of the:
- A aquaporins
- B porins
- C pumps
- D carriers
Answer: A. aquaporins
Why: The channels help in the rapid movement of water.
Question 6: Phloem Transport and the Pressure Flow Hypothesis
The movement of the organic and the inorganic solutes in the plant, mainly the sugars, from the leaves to the other parts, is called:
- A osmosis
- B diffusion
- C transpiration
- D translocation
Answer: D. translocation
Why: It occurs through the phloem.
Question 7: Transpiration and the Ascent of Sap
The opening and closing of the stomata is determined by the:
- A the number of the cells
- B the soil type
- C the temperature only
- D turgidity of the guard cells
Answer: D. turgidity of the guard cells
Why: The guard cells are kidney-shaped in the dicots.
Question 8: Water Potential and Osmosis
A fully turgid plant cell has a water potential equal to:
- A its solute potential, since pressure potential is zero
- B zero, since pressure potential exactly balances the negative solute potential
- C a large negative value
- D a large positive value regardless of solute potential
Answer: B. zero, since pressure potential exactly balances the negative solute potential
Why: At full turgidity, the pressure potential (positive, from wall resistance) exactly offsets the solute potential (negative), giving an overall water potential of zero: the cell can absorb no more water.