SSC MTS EXAM

Detailed explanation-1: -Ingenhousz placed submerged plants in sunlight and then in the shade. He noticed that small bubbles were produced by the plants when they were in the sunlight. When they were transferred to the shade bubbles were no longer produced by these plants. Ingenhousz later concluded that plants use light to produce oxygen.

Detailed explanation-2: -Van Helmont discovered that water was involved in increasing the mass of a plant. Priestley discovered that a plant produces the substance in air required for burning. Ingenhousz discovered that light is necessary for plants to produce oxygen.

Detailed explanation-3: -While we cannot prove in this experiment that the bubbles are oxygen without a gas probe, we can demonstrate, by use of a control, that the bubbles only form when the leaves are submerged in a sodium bicarbonate solution (which releases CO2) and not when they are submerged in pure water.