Monday morning, first period. You put a green leaf on the document camera and ask the class a question that sounds simple and is not: "How did this leaf make its own food?" Hands go up. "From the sun." "From the soil." "From water." All three answers are partly right and none of them is the whole story, which is exactly where a good week of science begins. Photosynthesis is a process students cannot see, built from words they have never used — chlorophyll, chloroplast, stomata, glucose — and the only way to teach it is to give them the words, the picture, and something real to do with both.
This guide walks through one week of teaching photosynthesis to grades 4–6, day by day, using a leveled reading passage, a labelled diagram, hands-on sorting and sequencing, and a leaf investigation that runs for seven to ten days. The packet is seventeen pages, and the teaching duration is one week, with a teacher lesson plan and notes to lay it out. The passage is called "How Plants Make Food," and it comes in two levels: Level 1 is 174 words in six paragraphs, Level 2 is 299 words in seven paragraphs. Both versions use numbered paragraphs, which matters more than it sounds — when a student answers a question, they can point to the paragraph that proves it.
Before Monday: Print Once, Sort Into Piles
The packet is short, so the preparation is short too. Print the passage at both levels, the vocabulary pages at both levels, the diagram at both levels, the cut-and-sort, the steps-in-order activity, the investigation log, the summary planner, and the answer keys for yourself. Read the two pages of answer keys before Monday — they tell you what the packet expects students to notice.
Decide who gets which level before the week starts. Level 1 is for students who need shorter text and more support: matching vocabulary, a diagram with a word bank, questions they can answer in a sentence. Level 2 is for students ready for more: 299 words, a word bank with context sentences, a diagram without a word bank, and short answers that cite a paragraph number. The levels are not groups. A student can read at Level 1 and do the diagram at Level 2, or the other way around, depending on the day and the task. Hand out the level that fits the student today, and move students between levels without making a fuss about it.
Put one real leaf on every table on Monday morning, and a second leaf in a dark cupboard somewhere in the room. You will need both of them by Wednesday, and the leaf in the cupboard is the whole investigation. Tell the class on Monday that the cupboard leaf is an experiment and nobody may open the cupboard until you say so. Children love a secret, and a secret that lasts a week is a good one.
Monday: The Big Idea in Plain Words
Start with the leaf on the document camera and the question from the opening of this guide. Let the class argue for a few minutes. "From the sun" is the most common answer, and it is the best place to start, because it is true and incomplete. A plant does use sunlight, but sunlight alone does not make food. It also needs water and air, and it needs something inside the leaf to catch the sunlight and do the work.
Then read the passage together. Read it aloud yourself first, at whichever level fits the class, and let students follow along. The first read is for the story: a plant takes in sunlight, water and air, and makes food for itself. Do not stop to define words on the first read. Let the story land, then go back.
The second read is for the words. There are six of them, and they are the vocabulary of the whole week: chlorophyll, chloroplast, stomata, glucose, producer and consumer. Say each one aloud, slowly, and let students say it back. Write them on the board with a one-line plain-language meaning next to each. Chlorophyll is the green stuff that catches sunlight. A chloroplast is the tiny part of the cell where the catching happens. Stomata are the tiny openings that let air in and out. Glucose is the sugar the plant makes — its food. A producer is a living thing that makes its own food. A consumer is a living thing that eats food someone else made.
The vocabulary pages follow the same two-level pattern as the passage. Level 1 is matching: draw a line from the word to its meaning. Level 2 is a word bank and context sentences: choose the right word for the sentence. Give students the level that fits, and let them work in pairs. Pairs argue about words, and arguing about words is vocabulary learning. When a pair disagrees about whether the sentence needs "chlorophyll" or "chloroplast," they are doing the thinking the worksheet is for.
End Monday with the summary planner. Not the writing — just the planner. Ask students to tell you, in their own words, what a plant needs and what it makes. Three things in, one thing out. If a student can say that on Monday afternoon, the week has started well.
Tuesday: The Diagram
Tuesday is the diagram, and the diagram is the day the idea becomes a picture. The labelled diagram comes in two levels: Level 1 with a word bank, Level 2 without one. Both versions ask questions about inputs and outputs, which is the right question, because photosynthesis is a story about what goes in and what comes out.
Teach the diagram the way you would teach a map. Start with the whole picture and name the parts before you label anything. The leaf, the sunlight coming in, the water coming up, the air going in through the stomata, the food being made inside, the oxygen going out. Point to each part as you name it, and let students point too. A diagram students have touched with their eyes is a diagram they can label.
Then hand out the diagram and let them label it. Level 1 students have the word bank, so the job is matching words to parts. Level 2 students have no word bank, so the job is remembering the words from Monday. That is a real difference, and it is the right one: Tuesday's job is to test whether Monday's words stuck.
The inputs and outputs questions are the part to slow down for. "What goes into the plant? What comes out?" Students who can answer that question in a sentence understand photosynthesis well enough for 4th grade, and well enough for 5th grade too. The cut-and-sort activity belongs here, on Tuesday afternoon, because it is the same question in a different form: cut out the inputs and the outputs, sort them into two piles, and answer four true/false items about what you sorted. A student who sorts "sunlight" into the inputs pile and "oxygen" into the outputs pile has understood the process. A student who sorts "glucose" into the inputs pile has a misconception worth catching now, while there is still a week to fix it.
Common mix-ups to watch for on Tuesday: students who think the plant eats soil, students who think oxygen is an input, and students who think glucose is something the plant takes in rather than something it makes. All three are sensible mistakes, and all three are fixed by the same question: "What goes in, and what comes out?" Ask it every time, and the sorting gets easier.
Wednesday: The Steps in Order
Wednesday is sequencing, and sequencing is where students prove they understand a process rather than just remembering words. The "Steps in Order" activity is a six-step cut-and-glue: students cut out the six steps of photosynthesis and glue them down in the right order. It sounds simple. It is not, because the steps only make sense in order, and a student who has memorized the words without understanding the process will put them in the wrong order and not know why.
Before you hand out the scissors, do the steps together on the board. Ask the class to put the steps in order out loud, and let them argue. "Does the sunlight come before the water, or does the water come first?" The argument is the learning. When a student says, "The plant has to take in the water before it can use the sunlight to make food," they are reasoning about a process, and that reasoning is the whole point of science in elementary school.
Then hand out the activity and let students cut and glue. Walk the room while they work and listen for the arguments. The pairs that argue are the pairs that are learning. The pairs that glue silently and quickly are the pairs to check on, because speed usually means guessing.
Wednesday is also the day to open the cupboard. Take out the leaf that has been in the dark since Monday, and put it next to a leaf that has been in the light. Ask the class what they notice. The dark leaf will look different — paler, weaker, maybe yellowing. Ask why. The answer is the investigation: the leaf in the dark could not catch sunlight, so it could not make food. Do not explain it fully yet. Let the observation sit, and start the investigation log.
The log asks one question: "Does a Leaf Need Light?" Students record what they see over seven to ten days, comparing a leaf in the light with a leaf in the dark. Set it up on Wednesday afternoon, with two leaves, two labels, and a promise to look every day. The log is the reason to come back to photosynthesis tomorrow, and the day after, and the day after that. A process students watch happening is a process they remember.
Thursday: Questions That Need Evidence
Thursday is the comprehension questions, and the questions are the reason the passage has numbered paragraphs. The questions come in two levels. Level 1 is multiple choice plus short answer. Level 2 is multiple choice plus short answer where the short answers cite a paragraph number. That citation is a small thing that matters enormously: a student who writes "paragraph 4" next to an answer has learned to prove what they say, and proving what you say is a skill that carries into every subject.
Teach the questions as a routine. Read the question. Find the paragraph that answers it. Write the answer in your own words. Cite the paragraph. Four steps, every time, and the routine is the teaching. Students who follow the routine get the answers right more often, and — more importantly — they know why their answers are right.
The true/false items from the cut-and-sort are worth revisiting on Thursday too. Four statements, true or false, about inputs and outputs. Go through them as a class and ask students to defend their answers with a paragraph number. "True or false: plants take in oxygen and give out carbon dioxide?" A student who answers from the passage will say false and point to the paragraph that proves it.
By Thursday afternoon, most students can tell you the whole story in a few sentences: a plant takes in sunlight, water and carbon dioxide, and uses chlorophyll in its chloroplasts to make glucose, giving out oxygen. If they can say that, and point to where the passage says it, the week has done its job.
Friday: Writing It Up and Looking at the Leaves
Friday is the summary planner and the writing lines. The planner asks students to organize what they know before they write: what goes in, what happens, what comes out. Let students fill in the planner in pairs, talking it through before they write anything. Talking is drafting. A student who can tell a partner the whole process can write it down.
Then the writing lines. A short summary, in the student's own words, of how a plant makes food. Not a copy of the passage — a summary. The difference matters. A student who copies the passage has practiced handwriting. A student who writes a summary has practiced understanding. If a student is stuck, send them back to the planner, not to the passage. The planner is their own thinking, and their own thinking is easier to write from than someone else's sentences.
Check the investigation log on Friday too. Three days in, the dark leaf should look different from the light leaf, and students should be recording what they see. Keep the log going into next week — it runs seven to ten days — and check it each morning. The log is a small daily ritual, two minutes at the start of science, and it keeps photosynthesis alive after the packet is finished.
The Photosynthesis Reading Passage includes a teacher lesson plan, notes, contents and two pages of answer keys, so Friday is also the day to check your own work. The answer keys tell you what the packet expects, and the notes tell you where students usually struggle — useful for next year, when a new class will struggle in the same places.
Differentiation Without Two Lessons
The two levels are the packet's best feature, and they only work if you use them the way they are designed. Both levels teach the same lesson, the same day, about the same process. Level 1 is not the easy group and Level 2 is not the smart group. They are two ways into the same science, and students should move between them as they grow.
A student who reads at Level 1 on Monday may be ready for the Level 2 diagram on Tuesday, because diagrams are a different skill from reading. A student who writes a strong summary at Level 2 on Friday may still need Level 1 matching for the vocabulary, because the words are new. Match the level to the task, not to the student, and say so out loud. "You have the word bank for this one" is not a judgment. It is a match.
For students who need more support, the diagram with the word bank and the matching vocabulary are the right starting points, and the cut-and-sort is the right activity, because sorting is thinking with your hands. For students who need more stretch, the Level 2 short answers with paragraph citations are the challenge, and the summary writing is where they can show what they know. The investigation log works for everyone, because watching a leaf change is the same job at every level.
For English learners, the six vocabulary words are the whole week in miniature. Teach them with pictures and gestures before you teach them with definitions. Point to a leaf for chlorophyll. Open and close your hand for stomata. Hold up a sugar packet for glucose, and say, "The plant makes its own sugar. That is its food." The words are hard. The ideas are not, and the ideas are what matter.
Using the Packet Beyond the Week
The packet fits a plants or life-science unit as the reading half of the science, and it fits small-group science reading when you want to work with four or five students at a time. The two levels make small groups easy: one group reads Level 1 together, another reads Level 2, and both groups answer the same questions about the same process.
It also fits homework and review. Send the passage and the questions home, and ask students to bring back the paragraph numbers. Send the diagram home and ask students to label it from memory, then check it against the word bank. The investigation log is the best homework of all, because it asks a student to look at a leaf every day and write down what they see, which is science as a habit rather than science as a worksheet.
For science sub plans in grades 4–6, the packet is close to self-running. Leave the lesson plan on the desk, the passage and questions in a pile, and the investigation log where the substitute can find it. A substitute who has never taught photosynthesis can run the week from the packet, because the packet was built to be run that way.
And for homeschool life science, the week is the same week, just smaller. One student, one leaf in the light, one leaf in the dark, and a log that runs for ten days. The investigation works just as well on a kitchen windowsill as in a classroom.
Frequently Asked Questions
How long does the unit take?
The listing gives a teaching duration of one week. The packet includes a teacher lesson plan and notes, and the investigation log runs 7–10 days, so the leaf observation continues into the following week.
What grades is it for?
Grades 4–6. The passage, questions, vocabulary and diagram all come in two levels, so the same lesson fits 4th graders and stretches to 6th graders.
What vocabulary does it cover?
Six words: chlorophyll, chloroplast, stomata, glucose, producer and consumer. Level 1 uses matching; Level 2 uses a word bank and context sentences.
What hands-on activities are included?
An inputs and outputs cut-and-sort with 4 true/false items, a 6-step "Steps in Order" cut-and-glue activity, a labelled diagram in two levels, and a 7–10 day "Does a Leaf Need Light?" investigation log.
How do the two levels differ?
Level 1 has a shorter passage (174 words in 6 paragraphs), matching vocabulary, and a diagram with a word bank. Level 2 has a longer passage (299 words in 7 paragraphs), a word bank with context sentences, a diagram without a word bank, and short answers that cite a paragraph number.
Can I use it for a sub plan?
Yes. The Photosynthesis Reading Passage includes a teacher lesson plan, notes, contents and two pages of answer keys, and the passage, questions and activities are self-contained enough for a substitute to run in grades 4–6.
What do I need besides the packet?
Two leaves, one kept in the light and one kept in the dark, plus scissors and glue for the cut-and-sort and the steps activity. The investigation log needs a windowsill and ten days.
