question_answer 9)

Differentiate between the following (i) red algae and brown algae. (ii)  liverworts and moss. (iii) homosporous and heterosporous pteridophyte. (iv) syngamy and triple fusion.

Answer:

(i) Differences between Red Algae and Brown Algae  

S. No.	Red Algae	Brown Algae
1.	It belongs to the class-Rhodophyceae.	It belongs to the class-Phaeophyceae.
2.	It is red in colour due to the presence of pigments chlorophyll-a, c and phycoerythrin. Example Stylolema, Rhodela.	It is brown in colour due to the presence of pigments phycocyanin and phycophaecin. Example Sargassum, Microcystis

  (ii)  Differences between Liverworts and Moss  

S. No.	Liverwort	Moss
1.	These are the member of class-Hepaticopsida of bryophytes.	These belongs to the class-Bryopsida of Bryophyta.
2.	Thallus is dorsoventrally flattened and lobed liver like.	Thallus is leafy and radially symmetrical.
3.	Rhizoids unicellular	Rhizoids are multicellular.
4.	Elaters are present in capsule to assist dispersal of spores	Elaters are absent, but peristome teeth are present in the capsule assist dispersal of spores.

(iii) Differences between Homosporous and Heterosporous Pteridophytes  

Homosporous Pteridophyte	Heterosporous Pteridophyte
Pteridophyters, which produce only one kind of spores. Example Lycopodium	These produce two kinds of spores, i.e., large megaspore and smaller microspore. Example Selaginella

  (iv) Differences between Syngamy and Triple Fusion  

Syngamy	Triple Fusion
It is the act of fusion of one male gamete with the egg cell to form zygote.	The act of fusion of second male gamete with secondary nucleus to form triploid endosperm is called triple endosperm is called triple fusion.