Question
Describe an experiment to show that plant organs move towards light.
Answer
- Materials required – Potted seedling, table.
- Procedure – The potted seedling is kept near the open window through which adequate sunlight falls on the seedling.
- Observation – After some days we notice that the stem moves towards the source of light i.e., towards the open window.
- Inference – We can thus say that the stem, moving towards the direction of the external stimulus i.e., light, is positively phototropic or in other words, positively heliotropic. The leaves being in a transverse position towards the external stimulus is transversely phototropic.
