It is the part of the digestive tract where approx 90% of the digestion and absorption of food occurs, the other 10% taking place in the stomach and large intestine. The main function of the small intestine is absorption of nutrients and minerals.That is, absorption of the nutrients and minerals in the food ingested, usually via the mouth, at an earlier stage in the digestive process.t is the part of the digestive tract where approx 90% of the digestion and absorption of food occurs, the other 10% taking place in the stomach and large intestine. The main function of the small intestine is absorption of nutrients and minerals.
Green seaweeds. Characteristics: Green colour from chlorophyll a and b in the same proportions as the 'higher' plants; beta-carotene (a yellow pigment); and various characteristic xanthophylls (yellowish or brownish pigments). Food reserves are starch, some fats or oils like higher plants.
Blue-green algae make up the division Cyanophyta in the kingdom Monera, which is made up of about 1,500 species of prokaryotic organisms. There is disagreement on whether or not this division should be considered algae or bacteria. Cyanobacteria (Blue Green Algae) differ from other types of bacteria in that they have chlorophyll a, which other photosynthetic bacteria donât have. Another characteristic that supports the algae argument is the fact that free oxygen is given off in blue-green algae photosynthesis but it is not given off in the photosynthesis of other bacteria. Many bacteria split H 2 S instead of H 2 O as a source of electrons during their photosynthesis; this is why they donât produce free O 2.