Match the following with respect to early experiments of photosynthesis.

	Column I		Column II
(a)	Variegated leaf experiment	(i)	CO2 is necessary for photosynthesis
(b)	Mohl’s half leaf experiment	(ii)	Importance of chlorophyll
(c)	Jan Ingen Housz	(iii)	Essential role of light in photosynthesis
(d)	Engelman	(iv)	First action spectrum
		(v)	Evolution of O2

	(a)	(b)	(c)	(d)
1.	ii	i	iii	iv
2.	i	ii	iii	iv
3.	iv	i	iii	ii
4.	iii	i	ii	iv

The variegated leaf experiment demonstrates the importance of chlorophyll in photosynthesis. Variegated leaves have green and non-green regions. Only the green areas containing chlorophyll can perform photosynthesis and produce glucose, while the non-green regions cannot. This experiment visually shows that chlorophyll is crucial for capturing light energy and converting it into chemical energy, essential for plant growth and survival.

In the late 18th century, Jan Ingenhousz, a Dutch-British scientist, conducted an experiment to investigate the role of light in photosynthesis. He observed that only the green parts of a plant (such as leaves) release oxygen bubbles when exposed to light. This led him to conclude that light is essential for photosynthesis and that only the green parts of the plant are involved in this process.

Jan Ingenhousz (1730-1799) was a scientist who demonstrated that sunlight is essential for a plant process that purifies air contaminated by burning candles or the respiration of animals.

Mohl's half-leaf experiment demonstrated that carbon dioxide (CO₂) is necessary for photosynthesis. By partially covering a leaf and preventing CO₂ from reaching one half, it was observed that photosynthesis occurred only in the exposed part with CO₂, indicating its essential role in the process.