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MODEL PAPER 1 — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYMODEL PAPER 13 Marks
Question
Differentiate between the following:
i. Red algae and brown algae
ii. Liverworts and moss
iii. Homosporous and heterosporous pteridophyte
✓

Answer

i. Red algae: The pigment phycoerythrin in Rhodophyceae gives it the unique red colour and hence the name red algae.
Brown algae: The pigment fucoxanthin in phaeophyceae gives it the unique brown colour and hence the name brown algae.
ii. In liverworts there is no protonema stage, while in moss the life cycle begins with the protonema stage.
iii. Majority of pteridophytes are homosporous, while some of them are heterosporous. Selaginella and salvinia are heterosporous. Basically the presence of heterospory in certain pteridophytes is a precursor of seed habits of higher plants, like gymnosperms and angiosperms.

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