DSE Biology: Cell Structure and Function

DSE Biology: Cell Structure and Function — Tutor Lesson Plan

2026-10-27

Tutor lesson-prep guides · Secondary biology

Students memorise organelle names but cannot answer why a cell has many mitochondria. Bind structure to function and the answers write themselves.

Objectives — the student can state the function of six organelles, name three differences between plant and animal cells, and calculate actual size from a magnification.

01 Prerequisites (3-minute check)

If any of these fails, fix it before the lesson starts.

Skill	Quick check	Pass mark
Cells as units	State that the cell is the basic unit	Correctly
Microscope use	Describe focusing steps	Correctly
Unit conversion	How many micrometres in a millimetre?	1000

02 Lesson flow (60 minutes)

Time	Stage	Tutor does	Student does
0-8 min	Match structure to function	Six organelles	Match and justify
8-22 min	Plant against animal	Wall, chloroplast, large vacuole	Tabulate
22-38 min	Specialised cells	Muscle, root hair	Explain the extra mitochondria
38-52 min	Magnification	Actual = image ÷ magnification	Three calculations
52-57 min	Answer wording	Because … so …	Rewrite an answer
57-60 min	Exit check	Three questions marked at once	Finish alone

03 Teaching script (read it out)

Scene 1: Structure plus function plus the cell job

Mitochondria carry out respiration and release energy; chloroplasts carry out photosynthesis; ribosomes make protein.
Answers take three parts: structure, function, and why that cell needs it.

Student writes one sentence per organelle.

Scene 2: Three differences, with one exception

Plant cells have a cell wall, chloroplasts and a large vacuole; animal cells do not.
But a root hair cell has no chloroplast, so “all plant cells have chloroplasts” is wrong.

Note: tabulate to avoid mixing them.

Scene 3: Magnification: divide, do not multiply

An image 30 mm long at 500x corresponds to 30 mm ÷ 500 = 0.06 mm = 60 micrometres.
Convert units first and give the answer in micrometres.

Student calculates three values with units.

04 Question types and worked steps

Type	Example	Steps	Answer
Function match	Which organelle respires?	Mitochondrion	Structure plus function
Comparison	Differences between plant and animal cells	Three rows	By task
Explanation	Why do muscle cells have many mitochondria?	High energy demand	Structure, function, link
Calculation	Image 30 mm at 500x	Divide by 500	60 micrometres

Sanity check (teach this): Any “why does this cell have many X” answer must link to the work that cell does, not just name the organelle.

05 Independent practice (3 questions)

Question	Answer	What to watch
Which organelle makes protein?	Ribosome	Function correct
Does a root hair cell have chloroplasts?	No	Knows the exception
Image 20 mm at 400x: actual size	50 micrometres	Unit conversion

06 Common mistakes and what to say

Mistake	Student writes	Say this
Naming only	answers “mitochondrion”	Say what it does.
Assuming all plant cells have chloroplasts	root cells included	Root cells do not.
Multiplying by magnification	multiplies instead of dividing	Actual size is a division.
Wrong unit	answers 0.06 micrometres	0.06 mm is 60 micrometres.

07 Homework (paper, section and question numbers)

Secondary chapter index — Use the three questions on this page

08 Exit check (last 5 minutes)

Question	Answer	Decision
Function of mitochondria	Respiration releasing energy	All right: move to cell division
Three plant-only structures	Cell wall, chloroplast, large vacuole	One wrong: re-teach
Image 20 mm at 400x	50 micrometres	Two wrong: repeat scene 4

09 Tutor FAQ

Are microscope practicals necessary?

Yes; seeing one real cell stabilises the structure questions.

How many organelles?

Six to eight for DSE, the rest recognition only.

Students lose marks on units.

Write the mm to micrometre step before calculating.

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A TutorZone lesson-prep guide. Written by the TutorZone team; questions and lesson flow are original and are not taken from any school or publisher material.