Free Xylem, Phloem, Blood and the Human Circulatory System Quiz | Secondary School Biology Practice

Transport in Plants and Animals

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The table below summarises some key features of the two vascular (transport) tissues found in plants.

Feature	Xylem	Phloem
Cell type	Dead, hollow, lignified cells	Living sieve tube cells and companion cells
Substance transported	Water and dissolved mineral ions	Dissolved sugars (mainly sucrose) and amino acids
Direction of movement	One direction only, upward from roots to leaves	Either direction, from a source (where made or stored) to a sink (where used or stored)

Based on the table, which of the following statements about xylem and phloem is correct?

Select one option.

Both xylem and phloem consist of living cells that actively transport substances in only one direction.
Xylem transports sugars from the leaves to the roots, while phloem transports water upward from the roots.
Phloem consists of dead, empty cells forming a continuous tube specialised for water transport.
Xylem transport is bidirectional, carrying materials to wherever they are needed, while phloem transport is strictly one-directional.
Xylem is composed of dead, hollow cells that transport water and dissolved mineral ions upward from the roots, while phloem is composed of living cells that transport dissolved sugars and amino acids in either direction, from source to sink.

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