SAQ : How will you prove the positive hydrotropic and negative hydrotropic movements in the plant body?

Question

How will you prove the positive hydrotropic and negative hydrotropic movements in the plant body?

Answer

To prove positive hydrotropic and negative hydrotropic movements in plant bodies, you can conduct the following experiments:

1. Positive hydrotropism experiment:
   a) Take a seedling with a straight root and remove all the lateral roots.
   b) Place the seedling on a moist substrate with a concentration gradient of water (i.e., one end with high water concentration and the other end with low water concentration).
   c) After some time, observe that the roots of the seedling bend towards the side with higher water concentration, indicating positive hydrotropic movement.
2. Negative hydrotropism experiment:
   a) Take a seedling with a straight root and remove all the lateral roots.
   b) Place the seedling on a moist substrate with a concentration gradient of water (i.e., one end with high water concentration and the other end with low water concentration).
   c) After some time, observe that the roots of the seedling bend away from the side with higher water concentration, indicating negative hydrotropic movement.