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MODEL PAPER 6 — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYMODEL PAPER 63 Marks
Question
Distinguish between Red, Brown and Green Algae.
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Answer

Red AlgaeBrown AlgaeGreen Algae
Mainly marine.Marine forms.Chiefly freshwater.
Only a few are unicellular.Unicellular forms do not exist.Unicellular species are more.
Thylakoids unstacked.Occur in groups of three.Stacked in groups of 2-20.
Only chlorophyll-a present.Chlorophyll 'a' and 'c' present.Chlorophyll 'a' and 'b' is present
Fucoxanthin presentFucoxanthin is present.Fucoxanthin is absent.
Phycobilins presentAbsentPhycobilins absent.
Reserve food is Floridean starch.Reserve food is Laminarin.Reserve food is starch.
Motile stages are not observed.Present.The motile stage is present.

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