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Conduction of water and mineral salts through the xylem vessels is enhanced because the xylem...

Biology
WAEC 2013

Conduction of water and mineral salts through the xylem vessels is enhanced because the xylem cells are

  • A. thickened with lignin
  • B. long, narrow tubes placed end to end
  • C. close to the endodermis
  • D. centrally placed in the roots
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Correct Answer: Option B
Explanation

Xylem cells have no cytoplasm or end walls, meaning they form a tube through which water can pass freely to allow water transport. Lignin strengthens the cell walls, helping to support the plant, OR The xylem always includes specialized cells modified for water conduction. These are called Tracheary Elements. These are genetically programmed to die and their empty cell walls then act as a conduit through which water moves up the plant.


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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Join your school's WhatsApp group
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Join your school's WhatsApp group