How can root pressure be observed?

How can root pressure be observed?
  1. By cutting the stem of a plant and observing the exudation of a solution
  2. By observing the water loss from the stomata in the leaves
  3. By measuring the rate of water movement in the phloem
  4. By observing the water droplets around the veins near the tip of grass blades and leaves of herbaceous plants

Solution

Root pressure can be observed by cutting the stem of a small soft-stemmed plant near the base with a sharp blade and observing the exudation of a solution due to the positive root pressure.

Asked in: NCERT

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