Match column I and column II and choose correct option

	Column I (Depth of sea water)		Column II (Type of Algae)
(a)	Near the surface	(i)	Brown algae
(b)	Intermediate depth	(ii)	Green algae
(c)	Deepest waters	(iii)	Red algae

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

The amount of light received decreases along with the depth of the ocean. The quality of light also varies with depth. Sunlight contains all of the colours of our visible spectrum (red, orange, yellow, green, blue, and violet). Red light has the longest wavelength and, therefore, the least amount of energy in the visible spectrum. As light wavelength decreases from red to blue light, so does the ability of light to penetrate water. Blue light penetrates best, green light is second, yellow light is third, followed by orange light and red light. Red light is quickly filtered from water as depth increases.  Red algae are able to reach the maximum depth in the sea unlike other photosynthetic organisms because: They have phycoerythrin pigment present in them. This pigment helps in trapping the sunlight of the shortest wavelength also i.e blue-green wavelength. Brown algae (has the pigment fucoxanthin) is found at the intermediate depth. Fucoxanthin absorbs light primarily in the blue-green to yellow-green part of the visible spectrum. Chlorophylls of green algae absorb primarily blue and red light and are found at the surface.