Question

Differentiate between the following:-
(i) red algae and brown algae
(ii) liverworts and moss
(iii) homosporous and heterosporous pteridophyte

Answer 1

(i) Red algae and brown algae:

Red algae	Brown algae
Red algae are grouped under the class Rhodophyceae.	Brown algae are grouped under the class Phaeophyceae.
They contain floridean starch as stored food.	They contain mannitol or laminarin as stored food.
They contain the photosynthetic pigments chlorophylls a and d, and phycoerythrin.	They contain the photosynthetic pigments chlorophylls a and c, and fucoxanthin.
Their cell walls are composed of cellulose, pectin, and phycocolloids.	Their cell walls are composed of cellulose and algin.
Flagella are absent.	Two flagella are present

(ii) Liverworts and moss:

Liverworts	Moss
They have unicellular rhizoids.	They have multicellular rhizoids.
Scales are present very often	Scales are absent
They are generally thalloid, with dichotomous branching.	They are foliage, with lateral branching.
Gemma cups are present.	Gemma cups are absent.
Sporophyte has very little photosynthetic tissue.	Sporophyte has abundant photosynthetic tissue.

(iii) Homosporous and heterosporous pteridophyte:

Homosporous pteridophytes	Heterosporous pteridophytes
They bear spores that are of the same type.	They bear two kinds of spores – microspores and megaspores.
They produce bisexual gametophytes.	They produce unisexual gametophytes.