Printable guide · ages 9–10

Tosbi’s Ecosystem Notebook: Cycles, Seasons and Fair Tests

Each lesson uses a made-up pond, plant or weather story with Tosbi. Many tasks are about links, cycles and fair tests, and the answers can be checked by reasoning. Never ask the child to describe a real place, a family matter or a personal event.

Materials: The screen is enough. Optional: paper and a pencil for drawing a food chain or a water cycle. Nothing needs to be recorded, typed or shared.

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What to notice

Notice whether the child follows an arrow from food to eater, and whether they check a fair test by changing only one thing.

If one link in this food web disappears, what else could change, and what would you check first?

Lesson 1

Links in an ecosystem

Goal: Name what a living thing needs from its surroundings, and one thing it gives back in return.

Many children picture living things as separate from their place. Show that most links run both ways: a plant gives shelter or food, and an animal gives something back, such as pollination or seed dispersal. Keep the stories about the pond and its living things, not about the child’s own life.

Starting point: Draw a pond on paper with a plant, a frog and a bee. Ask: what does the frog need from its surroundings?
A helpful phrase: “What does the bee get from the flower, and what does the flower get from the bee?”
A common mix-up: A child may think a link only runs from the living thing to its food. Say it plainly: “Many links run both ways.”
Notice the transfer: Replace the pond with a dry field and ask again. Notice whether the child says the frog still needs water and food, and what it would lose.

Show: A grasshopper needs two things from its surroundings. Touch them.

Lesson 2

Food chains and food webs

Goal: Explain that a food chain shows one path of energy, and that a food web joins many chains.

Children often think of arrows as a friendship or a relationship. Here each arrow shows energy moving from food to eater. The sun starts the flow but is not an eater. Keep the examples simple; the point is the direction, not a complete list of foods.

Starting point: Draw a grass, a grasshopper, a frog and a snake on paper. Ask: where does the energy start, and which way does it move?
A helpful phrase: “Which one does the frog eat? Where should the arrow start?”
A common mix-up: A child may draw the arrow from the eater to the food. Say it plainly: “The arrow starts at the food and points to the one that eats it.”
Notice the transfer: Remove the grasshoppers and ask what happens to the frogs. Notice whether the child explains the effect with the food web, not only with the picture.

Show: Build a pond chain. Put each living thing in the right place: first the producer, then the small eater, then the larger one.

Lesson 3

Decomposers

Goal: Classify producers, consumers and decomposers, and explain why decomposers keep nutrients moving.

Children often think dead things simply disappear. Decomposers are easy to overlook because they are small or hidden. Keep the examples in the soil, on the ground and in the leaf litter. The point is recycling.

Starting point: Hold up a dry leaf and ask: “Where will it go in a year?”
A helpful phrase: “Which living things could break it down? What would be left in the soil?”
A common mix-up: A child may think decomposers are only harmful. Say it plainly: “They are needed, because they feed the soil and the plants.”
Notice the transfer: Replace the leaf with a fallen log and ask again. Notice whether the child names the decomposers and the soil without help.

Show: Sort each sentence: does it break down dead material, or does it do something else?

Lesson 4

The water cycle

Goal: Put the water cycle steps in order, and name the energy source that drives evaporation.

Children often think the water cycle is a one-time event, or that clouds are made of smoke. Explain it as a loop: the same water keeps moving between places. Use the picture sequence, and avoid any wording that suggests water is used up.

Starting point: Pour a little water into a bowl, cover it with clear film, and leave it in the sun. Ask: where did the water go?
A helpful phrase: “What did the water become? Where did the drops on the film come from?”
A common mix-up: A child may think the water disappeared into nothing. Say it plainly: “It changed into vapour, and it is still around us in the air.”
Notice the transfer: Ask the child to name the source of energy. Notice whether they say the sun, not a magic force.

Show: A puddle dries up after the rain. Put each step in the right box.

Lesson 5

Why the seasons change

Goal: Explain that the tilt of Earth’s axis changes the angle and length of sunlight, and reject distance as the reason.

The distance idea is common because it seems logical. Show that the tilt explains both the length of the day and the slant of the light. Do not ask children to predict exact dates; the aim is the reason.

Starting point: Place a lamp in the middle of a table and a globe tilted in front of it. Ask: which part of the globe gets the most direct light?
A helpful phrase: “Which way is the top of the globe tilted? Does that part face the lamp more?”
A common mix-up: A child may say the closest side is the warmest. Say it plainly: “Being closer is not the reason. The tilt decides how straight the light hits.”
Notice the transfer: Move the globe around the lamp, keeping its tilt, and ask again. Notice whether the child explains the answer with the tilt, not with the distance.

Show: Touch the two facts that explain why July is summer in the north.

Lesson 6

Weather or climate?

Goal: Sort statements about weather (now, a few days) and climate (many years, a region’s usual pattern).

Children often hear weather and climate used as the same word. Keep the test simple: the time span. Avoid suggesting that one warm day proves a climate trend.

Starting point: Ask: “What is the weather like outside today? What is the usual weather here in July?”
A helpful phrase: “Would you need a forecast or a long record to answer that?”
A common mix-up: A child may say one storm proves the climate has changed. Say it plainly: “One storm is weather. Many years of records show climate.”
Notice the transfer: Give a statement with the time span missing and ask the child to supply it. Notice whether they choose a time span before deciding.

Show: Place each example in the right box: weather or climate.

Lesson 7

A fair test

Goal: Name the changed variable, the kept-the-same variables and the measurement in a plant test.

Children often change two things at once and then credit the wrong one. Show the habit of changing one variable at a time. The plant test is imagined; keep any real version to a simple setup with no unsafe materials.

Starting point: Set two cups with bean seeds. Ask: which one thing would you change to find out what helps the seeds grow?
A helpful phrase: “What else is different between the two cups? Could that change the result?”
A common mix-up: A child may think a test is fair if it looks neat. Say it plainly: “A fair test changes only one thing.”
Notice the transfer: Ask the child to name the changed variable before the measurement. Notice whether they name both the kept and the changed things.

Show: A test checks how sunlight affects plant growth. Touch the two things that must stay the same.

Lesson 8

Choosing a nature action with evidence

Goal: Compare two actions for a local problem, name the evidence each one needs, and pick the one best supported by data.

Children may feel strongly about nature and want to act at once. The lesson keeps the feeling and asks for evidence first. Use only made-up ponds and plants, and do not ask a child to judge a real place or a real person.

Starting point: Describe a pond with cloudy water and fewer frogs. Ask: what would you check first?
A helpful phrase: “What evidence would help you choose? Could you check it again later?”
A common mix-up: A child may think a feeling is enough to act. Say it plainly: “Feelings matter. We still check the evidence before we choose.”
Notice the transfer: Change the pond to a different problem and ask again. Notice whether the child asks for evidence before choosing an action.

Show: Put the evidence in one box and the action that follows from it in the other. The opinion goes in neither box.

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