Specialised Cells in Plants Revision Notes | GCSE OCR Foundation Biology

What this lesson covers

Investigate the structure and function of root hair cells, xylem and phloem cells, and how their specialisations enable them to carry out specific roles...

• Explain how root hair cells are adapted for water and mineral absorption
• Describe the structure and function of xylem cells in water transport
• Compare the structure and function of phloem cells in sugar transport
• Evaluate how cell specialisation improves plant efficiency

Key ideas to keep in view

Use this lesson to stay inside B2.1 Supplying the cell while connecting the detail back to the wider B2: Scaling up topic.

• B2: Scaling up
• B2.1 Supplying the cell
• GCSE OCR Foundation Biology

Lesson notes preview

Read the core explanations from Specialised Cells in Plants before testing yourself from memory.

• A plant faces a massive challenge: it needs to move water from its roots buried in soil up to leaves that might be 30 metres high. At the same time, it must transport the sugar it makes in its leaves down to every growing part. No single cell type could handle both jobs efficiently.
• This is where cell specialisation becomes crucial. Just like workers in a factory have different jobs, plant cells develop specific structures and functions. Some become expert absorbers, others become transport tubes, and others become sugar highways.
• The process by which cells develop specific structures and functions to carry out particular roles efficiently. This allows multicellular organisms to perform complex tasks that single cells cannot manage alone.
• 2. Root Hair Cells - The Absorption Specialists
• Picture the root of a plant under a microscope. You'll see thousands of tiny projections sticking out like microscopic fingers. These are root hair cells, and they're perfectly designed for one job: maximum absorption.
• A specialised plant cell found in roots with a long, thin projection that dramatically increases the surface area available for absorbing water and mineral ions from soil.
• The key adaptation is that long, thin projection - the root hair itself. This single extension can increase the cell's surface area by up to 10 times. More surface area means more space for water molecules to enter the cell through osmosis.
• Trap: Many students think root hairs are separate structures. Actually, each root hair is just an extension of a single cell - like stretching out your finger to reach something.
• Once water enters the root hair cells, it needs to travel upward - sometimes dozens of metres. This is where xylem comes in. Think of xylem as a plant's plumbing system, but with a twist: the pipes are made of dead cells.
• Specialised plant tissue consisting of dead, hollow cells arranged end-to-end to form continuous tubes that transport water and mineral ions from roots to leaves.

Continue through the topic

Move to the related lessons or back to the topic page when you need the wider sequence before exam-style practice.