cart Shopping Cart cart(0)

Leaning to the light

You will need:

 
  • 2 clear plastic jars
  • 1 packet of bean seeds
  • Paper towels
  • Water
  • 1 Dark Cupboard and 1 Sunlit Window

Instructions

 
  1. Place the paper towels around the inside edge of each jar.
  2. Place a bean seed between the paper towel and the side of the plastic jar.
  3. Wet the paper towels and place the jars on a sunlit window ledge until germination.
  4. After germination, place one jar inside a dark cupboard within the same room.
  5. The plant placed in the dark cupboard becomes white, grows poorly and dies first.
phototropism
Plants leaning to the light
Image courtesy www.excitingnature.com

The movement of plants towards light is called 'phototropism'. 'Photo' means light, whereas tropism means 'to move'. Plants grow by plant cells getting longer, or splitting into new cells. The cells on the side away from the light grow much faster than those on the sunlight side. This causes the plant stems to bend towards the light. Phototropism allows the plant leaves to get the full benefit of the sunlight energy.

The green chemical in plant leaves is called chlorophyll (....."Clo - ro - fill".....) changes sunlight into energy and sugar. The plant in the dark cupboard loses its green colour because sunlight helps to make chlorophyll.
Without chlorophyll plant growth stops as there is no more energy or sugars being produced.

Join our newsletter for more science teaching thoughts & ideas

Join the Fizzics newsletter

Back to botany experiments

>100 Free Science Experiments on this site!

Coloured shadows
  • Experiments to colour your class!
  • Easy & fun
read more
 
skeleton and student
  • Make fake blood & more!
  • Biology made simple
read more
 
electricity experiments
  • Circuit science for kids
  • Cheap materials found easily
read more
 
Vortex rings made with fog
  • Experiments using Newton's Laws
  • Step by step science
read more

School Science Visits: 

  • Highly engaging & curriculum-linked
  • Additional Teacher Support Resources
  • Professional visits in-class or via video conference
  • Both Primary School & High School science incursions
Call 1300 856 828 or use this form to discuss or make a show booking for your school!

Email updates

Signup to our monthly email Learn more
 

Contact us

1300 856 828
info@fizzicseducation.com.au

PO Box 272
Winston Hills, NSW, 2153, Australia
 
facebookgoogle plustwitter
linkedin youtube   ico6 pinterest