Phloem Flashcards

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What is phloem tissue in a plant?

Phloem is living transport tissue that carries dissolved food, mainly sugars, around the plant.

Which main sugar is transported in the phloem?

The phloem mainly carries sucrose, a soluble sugar made in the leaves during photosynthesis.

In which direction can substances move through the phloem?

Substances can move both up and down the plant in the phloem, to places where they are needed.

Are phloem cells living or dead, and how are they arranged?

Phloem cells are living and are joined end to end to form long tubes for transport.

What are sieve tubes and sieve plates in the phloem?

Sieve tubes are long columns of phloem cells whose end walls have many tiny holes called sieve plates to let sap flow through.

How is phloem different from xylem in what it carries?

Phloem carries dissolved food such as sugars and amino acids, while xylem carries water and mineral ions.

Why does a plant need phloem to move sugars away from the leaves?

Phloem moves sugars from the leaves to growing parts and storage organs, so they have energy and materials for growth.

Where in a plant is phloem tissue found?

Phloem is found in the veins of leaves and in vascular bundles running through the stems and roots.

What do companion cells do in the phloem?

Companion cells lie next to sieve tubes and provide them with energy, helping to move sugars into and out of the phloem.

Name one substance, other than sugars, that can be carried in the phloem.

The phloem can also carry amino acids, which are used to make proteins in growing parts of the plant.

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