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Difficulty: MediumPlant Biology and Photosynthesis

Water moves continuously through specialized tissues of a vascular plant before evaporating into the atmosphere. What is the correct sequential order of structures through which water travels during this transpiration stream?

  1. 1Root hair cells absorb water from the surrounding soil.
  2. 2Xylem vessels conduct water upward through the stem.
  3. 3Leaf mesophyll cells receive water for cellular hydration and photosynthesis.
  4. 4Water vapor evaporates into the air through open stomata.

Answer

The correct sequence begins with absorption by root hair cells, continues with upward conduction through stem xylem vessels, moves into leaf mesophyll cells, and ends with evaporation through leaf stomata.
Water transport follows a unidirectional upward path: it is absorbed from soil by root hairs, carried upward through the stem by xylem vessels, distributed to leaf mesophyll cells, and finally released as vapor through stomatal openings.

Step-by-Step Solution

1
Identify the initial site of water entry into the plant body.
Root hair cells absorb water from soil moisture through osmosis.
Water must enter external root boundaries before entering internal vascular pathways.
2
Determine the primary conduit for long-distance vertical transport.
Water enters xylem vessels and moves upward through roots and stems.
Xylem tissue provides continuous hollow tubing optimized for upward fluid conduction.
3
Identify the destination tissue in the photosynthetic organs.
Water spreads through leaf veins into mesophyll cells.
Mesophyll cells utilize water as a reactant in photosynthesis and to maintain cell turgor.
4
Identify the final exit point of water into the external environment.
Water evaporates from moist cell surfaces and diffuses through stomata as vapor.
Stomata are regulated surface pores that allow gas exchange and release transpirational water vapor.

Key Concept

Vascular water transport and transpiration pathway in plants
Estimated Time:1m 0s
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Topics

Plant Biology and Photosynthesis

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