🔬 ScienceGrade 2Lesson 33
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Plant Growth Observation

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Learning Objectives

  • 1Observe and record a plant's growth over several days using an observation journal
  • 2Identify what a plant needs to grow — water, sunlight, CO2, and soil nutrients
  • 3Connect daily observations to plant parts and photosynthesis
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Mini Lesson

Scientists do not just read about the world — they observe it directly. In this project lesson you will become a real plant scientist. By watching a plant grow and recording what you see, you will practice the most important skill in science: careful observation.

What does a plant need to grow?

  • Water — absorbed through the roots, then carried up the stem to every cell.
  • Sunlight — captured by the green pigment chlorophyll in leaves and used as energy for photosynthesis.
  • Carbon dioxide (CO2) — absorbed from the air through tiny pores in leaves called stomata.
  • Soil nutrients — minerals such as nitrogen, phosphorus, and potassium absorbed through roots help the plant build new cells.

How to make good observations

  • Observe at the same time each day so conditions are consistent.
  • Use your senses — describe what you see (color, height, number of leaves), feel (stem texture), and smell.
  • Draw a sketch alongside your written notes — scientists always include labeled diagrams.
  • Record numbers where possible: height in centimeters, number of leaves, number of new shoots.
  • Note anything unexpected — that is often where the most interesting science happens!

What to record each day

  • Date and time of observation.
  • Height of the plant (measure with a ruler).
  • Number of leaves and any new ones since yesterday.
  • Appearance — color, any spots, drooping, or new buds.
  • What you watered or changed (if anything).
  • One question you have about what you observed.

Project — Plant Growth Observation Journal

  1. Choose a plant — a potted houseplant, a seedling you grow from a bean or sunflower seed, or a plant in your yard.
  2. Set up your journal — use the observation journal page printed from this lesson. Give your plant a name and draw a "Day 1" sketch.
  3. Observe for 5 days — at the same time each day, complete one journal page: record height, leaf count, color, and any new growth.
  4. Sketch each day — draw the plant and label at least one part (root, stem, leaf, flower) that is visible.
  5. Write one question at the bottom of each day’s page — something you wonder about what you see.
  6. After day 5, write a short summary: What changed the most? What did the plant need most to grow? How does photosynthesis explain what you observed?
  • You will need: a plant, ruler, pencil, and your printed journal pages.
What a plant needs to grow — four requirementsFour labeled panels showing what a plant needs: water, sunlight, carbon dioxide, and soil nutrients.What Plants NeedWaterabsorbed by rootsup the stemSunlightcaptured by chlorophyllin leavesCO2 from airenters throughstomata in leavesSoil nutrientsminerals absorbedto build new cellsPhotosynthesis: water + CO2 + sunlight -> sugar + oxygen
The four things a plant needs — water, sunlight, CO2, and soil nutrients — and the photosynthesis equation.
Sample observation journal page for a growing plantA sample journal page with fields for date, height, leaves, color, notes, a sketch box, and a question for the day.Sample Journal EntryDate: ____________Time: __________Height: ______ cmLeaves: ______Color: ________New growth? ___What I observed:Write notes hereMy sketch:My question today:
Record date, height, leaf count, notes, a sketch, and a question each day.
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Ask yourself: What do I notice about my plant today that was different from yesterday — and can I explain why that change happened?

Vocabulary
Observation
What you detect with your senses — what you see, hear, feel, smell, or measuree.g. "The plant grew 2 cm taller and grew one new leaf today."
Photosynthesis
The process by which plants use sunlight, water, and CO2 to make food and release oxygene.g. leaves turn sunlight into sugar for the plant
Chlorophyll
The green pigment in leaves that absorbs light energy for photosynthesise.g. chlorophyll makes leaves look green
Stomata
Tiny pores in leaves where CO2 enters and oxygen and water vapor exite.g. stomata open and close to control gas exchange
Nutrients
Minerals in soil — like nitrogen, phosphorus, potassium — that plants absorb to growe.g. roots take up nutrients dissolved in water
Inference
A conclusion you draw from observations, rather than what you directly seee.g. "The plant grew toward the window, so it must need more light."
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