HORTICULTURE

Detailed explanation-1: -Dutch-born British physician and scientist Jan Ingenhousz discovered that light is necessary for photosynthesis. This observation built upon work begun by English scientist Joseph Priestley, who had burned a candle in a closed container until the air within the container could no longer support combustion.

Detailed explanation-2: -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-3: -Jan Ingenhousz, a dutch-born British physician and scientist discovered the role of light in photosynthesis. He showed that only the green parts of the plant are responsible for releasing oxygen. Because of this process plants release oxygen and consume carbon dioxide from the environment.

Detailed explanation-4: -Joseph Priestley ran a series of experiments in 1772 (Figure 3.1. 1). He tested a mouse, a candle, and a sprig of mint under hermetically sealed (no air can go in or out) jar.

Detailed explanation-5: -Joseph Priestly He put a mint plant in a closed container with a burning candle. The candle flame used up the oxygen and went out. After 27 days, Priestley was able to re-light the candle. This showed that plants produce a gas that allows fuels to burn.