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Difficulty: EasyPlant Biology and Photosynthesis

Water absorbed from the soil is vital for photosynthesis and nutrient transport in vascular plants. In what sequential order does water travel through a plant from the ground until it exits into the air?

  1. 1Water enters root hairs from the soil via osmosis.
  2. 2Water is pulled upward through xylem vessels in the stem.
  3. 3Water enters the photosynthetic mesophyll cells of the leaf.
  4. 4Water vapor evaporates into the atmosphere through open stomata.

Answer

The correct sequence begins with soil water absorption at the root hairs, followed by upward conduction through the stem xylem, distribution into leaf mesophyll cells, and finally evaporation into the atmosphere through stomatal pores.
The biological pathway of water in plants follows the transpiration stream: root hairs absorb water from soil, stem xylem conduits conduct it upward against gravity, leaf mesophyll cells receive it for cellular processes and photosynthesis, and excess water vapor diffuses outward through stomatal pores.

Step-by-Step Solution

1
Identify the initial entry point of water into the plant.
Water enters the plant through root hairs from the soil by osmosis.
Plant roots are submerged in soil moisture and serve as the sole uptake site for liquid water.
2
Trace the vertical vascular transport route.
Water travels up through the xylem vessels located in the stem.
Xylem is the specialized vascular tissue that transports water unidirectionally from roots to aerial structures.
3
Determine where water is delivered inside the leaf tissue.
Water moves into the leaf mesophyll cells.
Mesophyll cells in the leaf interior require water as a direct chemical reactant for photosynthesis.
4
Identify the exit pathway of water vapor during transpiration.
Water vapor diffuses out through leaf stomata into the surrounding air.
Stomata are surface openings that regulate gas exchange and allow water vapor loss.

Key Concept

The transpiration stream describes the unidirectional movement of water and dissolved minerals from soil through root hairs, xylem tissue, and leaf mesophyll, exiting via stomata.
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Topics

Plant Biology and Photosynthesis

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