A : Holophytic protistans are important phytoplanktons and they contibute 80% of the total photosynthesis.
R : They lack chemosynthetic nutrition nad utilize non sulphur organic compound as the source of electron and proton in carbon assimilation.
A. If both assertion & reason are true and the reason is the correct explanation of the assertion
B. If both assertion & reason are true but the reason is not the correct explanation of the assertion
C. If assertion is true statement but reason is false
D. If both assertion and reason are false statements