Organisation in Plants - AQA GCSE Biology Revision

Topic overview

What you need to know

Organisation in Plants is a key part of GCSE Biology. Connect structures to their functions and explain biological processes as clear causal sequences. Hollow, dead tubes in plants that transport water and dissolved minerals from roots to leaves. Movement is one-way upward. Living tubes that transport dissolved sugars (sucrose) from leaves to the rest of the plant (translocation). Moves both ways. The loss of water vapour from the leaves through stomata. Creates a transpiration stream that pulls water up through xylem.

Exam tip

Use precise scientific vocabulary and make each link in an explanation explicit.

Revision notes

Core ideas

Secure these ideas first. Say each definition in your own words, then connect it to the topic overview.

Xylem: Hollow, dead tubes in plants that transport water and dissolved minerals from roots to leaves. Movement is one-way upward.
Phloem: Living tubes that transport dissolved sugars (sucrose) from leaves to the rest of the plant (translocation). Moves both ways.
Transpiration: The loss of water vapour from the leaves through stomata. Creates a transpiration stream that pulls water up through xylem.
Stomata: Tiny pores (holes) on the underside of leaves that allow gas exchange (CO₂ in, O₂ out) and water loss.

Revision notes

Apply it in the exam

The exam will rarely ask for an isolated definition. Practise selecting the right idea and using it as part of a complete explanation or method.

Guard Cells: Specialised cells that surround stomata and control their opening and closing.
Translocation: The movement of dissolved sugars from the leaves (source) to other parts of the plant (sink) through phloem.
Root Hair Cell: A specialised cell with a long extension that increases surface area for absorption of water and minerals from the soil.
Meristem Tissue: Found at the tips of roots and shoots; contains undifferentiated cells that can divide rapidly for growth.

Core knowledge

Key facts for Organisation in Plants

8 essentials

Xylem

Hollow, dead tubes in plants that transport water and dissolved minerals from roots to leaves. Movement is one-way upward.

Phloem

Living tubes that transport dissolved sugars (sucrose) from leaves to the rest of the plant (translocation). Moves both ways.

Transpiration

The loss of water vapour from the leaves through stomata. Creates a transpiration stream that pulls water up through xylem.

Stomata

Tiny pores (holes) on the underside of leaves that allow gas exchange (CO₂ in, O₂ out) and water loss.

Guard Cells

Specialised cells that surround stomata and control their opening and closing.

Translocation

The movement of dissolved sugars from the leaves (source) to other parts of the plant (sink) through phloem.

Root Hair Cell

A specialised cell with a long extension that increases surface area for absorption of water and minerals from the soil.

Meristem Tissue

Found at the tips of roots and shoots; contains undifferentiated cells that can divide rapidly for growth.

Active recall

Close the notes and answer these

1.Without looking, explain xylem and give one example or consequence.
2.Without looking, explain phloem and give one example or consequence.
3.Without looking, explain transpiration and give one example or consequence.
4.Without looking, explain stomata and give one example or consequence.

Content reviewed 23 July 2026 against the current linked specification.

Finished learning?

Mark the notes complete, then test what you can recall.

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