|
Answer» (i) Red algae and brown algae | Red algae | Brown algae | | 1. Red algae are grouped under the class Rhodophyceae. | 1. Brown algae are grouped under the class Phaeophyceae. | | 2. They contain floridean starch as stored food. | 2. They contain mannitol or laminarin as stored food. | | 3. They contain the photosynthetic pigments chlorophylls a and d, and phycoerythrin. | 3. They contain the photosynthetic pigments chlorophylls a and c, and fucoxanthin. | | 4. Their cell walls are composed of cellulose, pectin, and phycocolloids. | 4. Their cell walls are composed of cellulose and algin. | | 5. Flagella are absent | 5. Two flagella are present |
(ii) Liverworts and moss Liverworts | Moss | 1. | They have unicellular rhizoids. | 1. | They have multicellular rhizoids. | 2. | Scales are present very often | 2. | Scales are absent | 3. | They are generally thalloid, with dichotomous branching. | 3. | They are foliage, with lateral branching. | 4. | Gemma cups are present | 4. | Gemma cups are absent | 5. | Sporophyte has very photosynthetic tissue little | 5. | Sporophyte has abundant photosynthetic tissue |
(iii) Homosporous and heterosporous pteridophyte Homosporous pteridophytes | Heterosporous pteridophytes | 1. | They bear spores that are of the same type. | 1. | They bear two kinds of spores – microspores and megaspores. | 2. | They produce bisexual gametophytes. | 2. | They produce unisexual gametophytes. |
|
