Pathway Taken by Water (Cambridge O Level Biology)

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Naomi H

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Naomi H

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Pathway Taken by Water

  • Water enters roots via root hair cells, by the process of osmosis
  • Water then moves across the root, through the cells of the root cortex
  • Water travels from the roots to the leaves of plants in the xylem, where it moves into the cells of the leaf mesophyll
  • The pathway of water through a plant can be summarised as follows:

root hair cell → root cortex cells → xylem → leaf mesophyll cells

Water movement across plant roots diagram

Pathway of water into and across a root

Water enters roots via the roots hair cells and crosses the cortex to reach the xylem

Water movement through a leaf diagram

Water moving from the xylem to the leaf mesophyll

Water exits the xylem in the leaves, where it enters the mesophyll cells before being lost through the stomata

Investigating Water Movement in Plants

  • The movement of water through a plant can be observed by placing a plant stem, e.g. celery, into a beaker of water that has had a stain added to it, e.g. food colouring
  • The dyed water will be taken up by the celery, and travel through the xylem to the leaves
  • A cross-section cut through the celery stem will show regions of different colour from the food dye; this shows the location of the xylem vessels

Water movement in celery diagram

Investigating water movement in plants using a stain

Food colouring can be used to show the location of xylem vessels in celery stems

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Naomi H

Author: Naomi H

Expertise: Biology

Naomi graduated from the University of Oxford with a degree in Biological Sciences. She has 8 years of classroom experience teaching Key Stage 3 up to A-Level biology, and is currently a tutor and A-Level examiner. Naomi especially enjoys creating resources that enable students to build a solid understanding of subject content, while also connecting their knowledge with biology’s exciting, real-world applications.