School learnersObserve and diagnoseExample · 1 question · 2 min

Seedling Diagnosis: Evidence Before Certainty

Use a small, fictional seedling data set to distinguish what was observed from what is only a likely explanation.

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Your example

Seedling observations after 7 days

Pot	Height	Colour	Place
A	6 cm	dark green	windowsill
B	11 cm	pale yellow	back of shelf
C	7 cm	green	windowsill

Three cress seedlings, same seeds, each watered with 20 mL a day. A on the windowsill: 6 cm, dark green. B at the back of the shelf: 11 cm, pale yellow. C on the windowsill: 7 cm, green.

Choose one answer

Seedling B is taller and paler than A and C. Which explanation fits best, and how would you test it fairly?

B got more light, because light makes plants grow taller.Probably too little light. Test it: same seeds, same water, only the place changes.

Show a hint

Look at height, colour and place. Then ask which single thing a fair test should change.

About this activity

What you practise: For a new three-row case, write one observation, one cautious explanation and one test that changes only the proposed cause.

A hand-written example with a fixed sequence. It shows what working on a Klarisma activity feels like; your own activities follow your goals and material.

An example with fictional data. Your answers stay on this page and are cleared when you restart or leave.

Seedling B is taller and paler than A and C. Which explanation fits best, and how would you test it fairly? Three cress seedlings, same seeds, each watered with 20 mL a day. A on the windowsill: 6 cm, dark green. B at the back of the shelf: 11 cm, pale yellow. C on the windowsill: 7 cm, green. B stands at the back of the shelf, is the tallest and the palest. Seedlings in poor light stretch towards the light and make little green pigment. That is a well-founded guess, not proof: a fair test changes only the light and keeps water and seeds the same.