🌱 Green Onion Light Experiment

🔬 The Question:

Do plants need light to grow?

You will test 2 onions.

One onion gets light. One onion stays in the dark.

Which one will grow better?

🧪 What you need:

• 2 green onions (from grocery store)
• 2 clear plastic cups (same size)
• Water
• Tape and marker (to label cups)
• Dark cabinet (for dark onion)
• Ruler (to measure height)
• Scale (to weigh onions)

📝 Setup - Day 0 (Today):

1. Get 2 green onions. Pick ones that look the same size.
2. Label Cup #1: Write "DARK" on the cup.
3. Label Cup #2: Write "LIGHT" on the cup.
4. Fill both cups with water (about halfway).
5. Put onion roots in water. Onion bottom should touch water.
6. Measure both onions: Write height and weight in the table below.
7. Put DARK onion in cabinet. Close door! No light!
8. Put LIGHT onion on counter in classroom. Leave it there!

📊 Write what you see:

Measure your onions on Day 0, Day 7, and Day 14.

🤔 Think about it:

1. Which onion grew taller?
2. Which onion got heavier (more grams)?
3. Which onion stayed green?
4. Why did the dark onion turn yellow?
5. Do plants need light? How do you know?

💡 What you learned:

DARK onion:

• Grew TALL but thin and weak
• Lost weight (got lighter)
• Turned YELLOW or white
• Why? No light = no photosynthesis = no food made!

LIGHT onion:

• Grew shorter but STRONG
• Gained weight (got heavier)
• Stayed GREEN
• Why? Light = photosynthesis = makes food!