50 Most Important NEET PYQs of Chapter 11: Transport in Plants – Part 2 (Q26–50)

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 πŸ§ͺ 50 Most Important NEET PYQs of Chapter 11: Transport in Plants – Part 2 (Q26–50)

By neetpyqall

Welcome to Part 2 of NEET Previous Year Questions from Chapter 11: Transport in Plants. Below are questions 26 to 50 with detailed explanations to solidify your grasp of the concepts.

26. The unit of water potential is:

A) Pascal
B) Bars
C) mm Hg
D) All of these
✅ Answer: D) All of these
Explanation: Water potential can be expressed in various pressure units like Pascal, bars, or mm Hg.

27. Movement of food in phloem is:

A) Upward
B) Downward
C) Multidirectional
D) Random
✅ Answer: C) Multidirectional
Explanation: Unlike xylem, phloem transport occurs from source to sink, in any direction based on need.

28. The main driving force for the movement of water in xylem is:

A) Root pressure
B) Transpiration pull
C) Imbibition
D) Capillary action
✅ Answer: B) Transpiration pull
Explanation: This is the major mechanism for long-distance water transport, especially in tall plants.

29. Which of the following has highest water potential?

A) Pure water
B) 1M sugar solution
C) 1M NaCl solution
D) 1M urea solution
✅ Answer: A) Pure water
Explanation: Pure water has the highest water potential (Ξ¨ = 0), and solute addition makes it more negative.

30. The pressure potential in a flaccid cell is:

A) Zero
B) Positive
C) Negative
D) Equal to osmotic potential
✅ Answer: A) Zero
Explanation: Flaccid cells have no turgor pressure, so their pressure potential is zero.

31. Aquaporins are:

A) Lipids
B) Enzymes
C) Water channel proteins
D) Hormones
✅ Answer: C) Water channel proteins
Explanation: Aquaporins facilitate rapid water transport across cell membranes.

32. Plasmolysis occurs due to:

A) Endosmosis
B) Exosmosis
C) Imbibition
D) Active transport
✅ Answer: B) Exosmosis
Explanation: Water moves out of the cell in a hypertonic solution, leading to plasmolysis.

33. The translocation of organic solutes in phloem occurs due to:

A) Root pressure
B) Diffusion
C) Mass flow
D) Capillary action
✅ Answer: C) Mass flow
Explanation: According to MΓΌnch’s hypothesis, solutes move from source to sink via pressure-driven mass flow.

34. Transpiration rate increases with:

A) High humidity
B) Low temperature
C) Wind
D) Darkness
✅ Answer: C) Wind
Explanation: Wind removes the water-saturated air from around the leaf, enhancing transpiration.

35. During active transport:

A) ATP is not used
B) Molecules move along concentration gradient
C) ATP is used
D) It occurs only through xylem
✅ Answer: C) ATP is used
Explanation: Active transport is an energy-dependent process that moves substances against their gradient.

36. Movement of water from one cell to another via plasmodesmata is:

A) Apoplastic
B) Symplastic
C) Transmembrane
D) Guttation
✅ Answer: B) Symplastic
Explanation: Symplastic movement occurs through cytoplasm and plasmodesmata.

37. Guttation is observed through:

A) Stomata
B) Hydathodes
C) Lenticels
D) Cuticle
✅ Answer: B) Hydathodes
Explanation: Guttation occurs at leaf margins through special pores called hydathodes.

38. Which is correct regarding osmosis?

A) Movement of solute from high to low concentration
B) Movement of solvent from high to low concentration
C) Movement of water from low to high water potential
D) Movement of water from high solute to low solute
✅ Answer: B) Movement of solvent from high to low concentration
Explanation: Osmosis involves movement of water (solvent), not solute.

39. Sucrose is translocated in phloem through:

A) Simple diffusion
B) Facilitated diffusion
C) Active transport
D) Passive transport
✅ Answer: C) Active transport
Explanation: Loading of sucrose into phloem involves energy input via active transport.

40. Pressure flow hypothesis explains the movement of:

A) Water in xylem
B) Minerals in root
C) Sugars in phloem
D) Water through aquaporins
✅ Answer: C) Sugars in phloem
Explanation: It proposes mass flow due to pressure difference between source and sink.

41. In a wilted plant, revival can occur by:

A) Active transport
B) Decrease in osmotic potential
C) Increase in turgor pressure
D) Plasmolysis
✅ Answer: C) Increase in turgor pressure
Explanation: Turgidity restores the firm structure of plant cells.

42. Most of the water absorbed by plants is lost through:

A) Guttation
B) Transpiration
C) Respiration
D) Photosynthesis
✅ Answer: B) Transpiration
Explanation: Over 90% of absorbed water is lost via transpiration.

43. Which factor decreases the rate of transpiration?

A) Light
B) Wind
C) High humidity
D) High temperature
✅ Answer: C) High humidity
Explanation: High humidity reduces the water potential gradient between leaf and atmosphere.

44. The energy required for active transport in plants is provided by:

A) Mitochondria
B) Golgi apparatus
C) Ribosomes
D) Chloroplasts
✅ Answer: A) Mitochondria
Explanation: ATP needed for active transport is generated by mitochondria.

45. The water potential of pure water is:

A) Zero
B) One
C) Negative
D) Positive
✅ Answer: A) Zero
Explanation: Pure water has maximum potential and is assigned Ξ¨ = 0.

46. Transpiration helps in:

A) Uptake of CO₂
B) Cooling of leaves
C) Food translocation
D) Photosynthesis
✅ Answer: B) Cooling of leaves
Explanation: Evaporation of water during transpiration lowers leaf temperature.

47. Which of the following helps in absorption of water by roots?

A) Osmotic pressure
B) Diffusion pressure
C) Transpiration pull
D) All of these
✅ Answer: D) All of these
Explanation: All contribute to water absorption and movement in plants.

48. Ascent of sap can occur even in absence of:

A) Root pressure
B) Transpiration
C) Xylem
D) Cohesion
✅ Answer: A) Root pressure
Explanation: Transpiration pull is the main mechanism; root pressure is secondary.

49. In phloem loading, which cells help in transport?

A) Parenchyma
B) Sieve cells
C) Companion cells
D) Vessels
✅ Answer: C) Companion cells
Explanation: Companion cells assist sieve tube elements in loading and unloading of sugars.

50. Osmotic pressure is:

A) Minimum pressure to stop osmosis
B) Maximum pressure to stop osmosis
C) Pressure exerted by pure water
D) None of the above
✅ Answer: B) Maximum pressure to stop osmosis
Explanation: It’s the pressure needed to prevent water from diffusing through a semi-permeable membrane.

πŸ“˜ That completes all 50 most important NEET PYQs from Chapter 11: Transport in Plants!
Keep revising and testing yourself to build conceptual clarity and confidence.

πŸ“š For more NEET Biology content and practice:
πŸ”— neetpyqall.blogspot.com
πŸ”— biologyatease1.blogspot.com


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