Design an experiment to demonstrate hydrotropism.
Answers
Experiment to demonstrate hydrotropism:
(i) Take a wire mesh and cover it with moist saw dust.
(ii) Place some germinated seedling (pea or gram) on the moist saw dust.
(iii) Keep the saw dust moist by sprinkling water at regular intervals. Observe after 2-3 days.
(iv) As the radicals come out of the seeds, they are seen to move towards the perforation. After some growth they bend back and enter the perforations to reach the moist saw dust in complete disregard of gravity (positive hydrotropism).
Conclusion: Bending of radicals back into moist saw dust is a hydrotrophic movement. It occurs despite being against the force of gravity.
Answer:
To demonstrate hydrotropism in plants.
Procedure :
i. Plant a seedling in a vessel containing soil.
ii. Adjacent to the seedling put a porous pot containing water.
iii. Leave the set up for few days.
Observation :
iv. On examining the roots it is observed that the roots bend towards the source of water and do not grow straight.
result :
It confirms that plant shows hydrotropism as the roots bend towards the porous pot of water. As hydrotropism is a plant growth response in which the direction of growth is determined by a stimulus of gradient in water concentration.