Edumarz

Differentiate between the following: (i) Red algae and brown algae (ii) Homosporous and heterosporous pteridophytes (iii) Liverworts and moss (iv) Syngamy and triple fusion.

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Priyanti, Subject Matter Expert at Edumarz


Solution: 


Red Algae (Rhodophyte)

Brown Algae (Phaeophyte)

Their photosynthetic pigments include chlorophyll a, chlorophyll d and phycoerythrin.

Their photosynthetic pigments include chlorophyll a, chlorophyll c and fucoxanthin.

Their food is stored as floridean starch.

They store food in the form of mannitol and laminarin.

Their cell walls are composed of cellulose and sulphated phycocolloids. Thylakoids are unstacked.

They have non-sulphated phycocolloids and cellulosic cell walls. Thylakoids are stacked in groups of three.

Eg. Porphyra, Rhodella

Eg. Kelps, Dictyotales




Homosporous Pteridophytes

Heterosporous Pteridophytes

They produce a single type of spore separated by sex.

They produce two different types of spores belonging to opposite sexes.

They have bisexual gametophyte

They have unisexual gametophyte.




Liverworts

Mosses

They exhibit dichotomous branching.

They exhibit lateral and extra-axillary branching.

They belong to the Marchantiophyta division and do not have the protonema stage.

They belong to the Bryophyta division and have a protonema stage.




Syngamy

Triple Fusion

It involves the fusion of male and female gametes during fertilization.

It involves the fusion of male gamete (sperm) with the two polar nuclei during double fertilization.

It results in the production of diploid zygote which forms the embryo.

It results in the production of triploid endosperm.

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