life sciences presentation 19.pptx NONDUMISO MPANA

this is life sciences presentation for microlesson semester 2

1. Frits Went Experiment phototropism

2. How do plants know which way to grow?

3. Frits Went (1928) discovered that a chemical in the tip of a plant controls how it bends towards light . That chemical is the plant hormone auxin . He conducted an experiment to prove his hypothesis.

4. EXPERIMENT

5. Results of an experiment Agar in middle plant grows straight Agar on one side plant bends No tip / no auxin no growth Auxins controls growth by movin g to one side Unequal auxins results to bending towards light This explains phototropism .