Classify algae on the basis of pigments and stored food.
Answers
Explanation:
What is the basis of classification of algae? The presence or absence of pigments is the main basis of classification of algae. Chlorophyceae: Chlorophyll a and b are present in them and impart green colour. Chlorophyceae are also called 'blue-green algae'.
Answer:
1) Red algae - Rhodophyta store food as a type of starch known as floridean starch (a branched starch) >>stored outside<< the chloroplast. Thier pigments include Chlorophyll A & D, carotenoids, & phycobilins. Phycoerythrin with both chlorophylls allows photosynthesis in deep water where blue light predominates.
2) Brown algae-Phaeophyta store food as laminarin, mannitol and lipids. Pigments include Chlorophyll A & C1 or C2 with carotenoids like amber fucoxanthin and violaxanthin
3) Green algae – Chlorophycophyta store food as starch inside the chloroplast. Pigments include Chlorophyll A & B plus carotenoids & xanthophylls in the same proportions as plants.
4) Ochrophyta - Chrysophyta - includes diatoms, golden algae class Chrysophyceae and yellow-green algae class Xanthophyceae - pigments include with Chlorophyl A & C1 or C2 or E in the yellow-green Xanthophyceae, plus fucoxanthin & other carotenoids. Their food reserves are leucosin and oils.
5) The Phylum Euglenozoa
Food reserves are paramylum and fats. Pigments Chlorophyll A & C, carotenoids.
6 Dinoflagellates - Pyrrophytes.
Food reserves are starch and oils. Pigments Chlorophyll A & C2, carotenoids.