Learners of class Xth performed an investigation in which they have observed the efffect of tropism on growth of plants through germinating cress seeds.
They set up four petridishes
Petridish-1: Cress seeds (10 in number) , soaked cotton, water and placed in sunlight
Petridish-2: Cress seeds (10 in number), Soaked cotton, water and placed in dark
Petridish-3: Cress seeds (10 in number), soaked cotton, water and sunlight only from one point
Petridish-4: Cress seeds (10 in number), soaked cotton, water and sunlight but placed vertically
They observed
Petridish-1: Growth of seeds
Petridish-2: Growth of seeds but the leaves appear yellow in colour
Petridish-3: Growth of seeds but the leaves turned towards the source of light
Petridish-4: Growth of seeds but the leaves rise vertically up in direction of sunlight.
The investigation made students more confident in understanding of the role of auxins( plant hormone) in controlling tropic responses.
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