Link palisade mesophyll cells with photosynthesis
Connect chloroplast-rich leaf cells with their specialised function.
Section B2.1 · Cell structure
Exam scope and assessment notes
Mapped to the named 0973 section using teaching from the corresponding single-science course. A 0973-specific review of every Core and Supplement objective is still in progress. Written practice is self-checked; it does not demonstrate supervised laboratory competence or award an official Cambridge grade. This qualification reports two grades on the 9–1 scale; confirm the entry route for your zone and exam series.
Before you begin
- Recall the distinction between plant, animal and bacterial cells. Read the supplied evidence before drawing a conclusion.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Which structure contains chlorophyll?
What you will learn
- Identify the palisade cell role.
- Connect chloroplasts and leaf position with photosynthesis.
A photosynthetic leaf cell
Palisade mesophyll cells are photosynthetic cells in leaves. They contain many chloroplasts with chlorophyll, which absorbs light. In a typical leaf they occur near the upper surface, where light can reach them through the outer tissue.
The elongated cell and its chloroplast-rich contents support photosynthesis, but a rectangular outline alone does not identify a palisade cell. Combine the leaf location and reported chloroplasts. A root hair cell is also a plant cell but has a different specialised function.
Photosynthesis does not cancel respiration
Palisade cells also have mitochondria and carry out respiration. Light capture in chloroplasts and energy release through respiration are distinct processes. Their nucleus, cytoplasm and ribosomes retain the usual roles of a typical living plant cell.
A green leaf photograph is not evidence of the exact number of chloroplasts in one cell. Use the supplied cellular diagram for identification and avoid treating a schematic chloroplast count as a universal count for the tissue.
Sources for this lesson
Pause and explain
Why are palisade cells and root hair cells both plant cells but different?
Worked example
A cell from leaf mesophyll contains many chloroplasts. Explain its likely specialised role.
Show the worked solution
- Leaf position gives photosynthetic context.
- Chlorophyll in chloroplasts absorbs light.
- The cell is adapted for photosynthesis.
Answer Photosynthesis in a chloroplast-rich palisade mesophyll cell.
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Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Name the specialised process and relevant organelle of a palisade cell.
Give me a hint
Link chlorophyll-containing structures with light.
Compare my reasoning
- The organelles are chloroplasts.
- The specialised process is photosynthesis.
Photosynthesis; chloroplasts.
Look for these in your work
- Correct pair.
- Do not substitute mitochondria.
Compare one specialised function of palisade and root hair cells.
Give me a hint
Use leaf versus soil contexts.
Compare my reasoning
- Palisade cells photosynthesise.
- Root hair cells absorb water and mineral ions.
Photosynthesis versus absorption of water and mineral ions.
Look for these in your work
- Both functions.
- Correct cell match.
A student removes mitochondria from a palisade-cell model because it contains chloroplasts. Explain the correction.
Give me a hint
Both organelles have different tasks.
Compare my reasoning
- Chloroplasts enable photosynthesis.
- Mitochondria enable aerobic respiration.
Keep both; photosynthesis does not replace respiration.
Look for these in your work
- Two distinct roles.
- Correct the false exclusion.
Common mistakes
- Palisade cells also respire.
- A diagram’s chloroplast count is schematic.
What can you explain now?
Which process is the specified role of palisade mesophyll cells?
Compare with the explanation
Photosynthesis.
Their many chloroplasts support light-driven synthesis.
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Make it stick
Explain the role of chloroplasts and why mitochondria are still needed.
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.