Question

Who discovered that green plant parts and light are essential for photosynthesis?
A. Engelmann
B. Ingenhousz
C. Sachs
D. Priestley

Answer 1

Hint: Photosynthesis is a phenomenon where green leaves of the plants prepare their own food in the chloroplast during the presence of light.
In this process, water and carbon dioxide is very much essential to prepare glucose as food and oxygen.

Complete answer: Photosynthesis was discovered by a famous scientist named Jan Ingenhousz. Through his experiments, he showed that the photons of the sunlight are essential for the plant that help the plants to purify the air contaminated by the carbon dioxide that comes into the atmosphere by breathing of mouse and the burning candle experiment in Priestley's bell jar.
In another experiment with Hydrilla, an aquatic plant, he showed that when bright sunlight falls on it, small bubbles of oxygen were formed around the green parts of the plant.
This happens only in light conditions. But when this same experiment was performed on dark conditions, no bubbles of oxygen were formed.
He was the first to identify those bubbles to be of oxygen.

Thus, the correct answer is option B. Ingenhousz.

Note: W. Engelmann later extend the study of scientist Jan Ingen-Housz and he also studied the observations that were made by scientist Priestley and finally he demonstrated his theory that is the role of light in the production of oxygen by photosynthesis in plants.