Algae Biology PDF
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Uploaded by ResplendentPanFlute
University of Ruhuna
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Summary
This document details the characteristics of various types of algae, including their structures, reproduction, and roles in ecosystems. It covers general characteristics and specific examples of different genera, referencing features such as cell walls and photosynthesis.
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Prokaryotes Eukaryotes cell wall usually contains Peptidoglycan absent peptidoglycan nuclear division not by nuclear division usually chromosome or nuclear by mitosis or meiosis membrane no sexual reproduction but sexual reproduction is this...
Prokaryotes Eukaryotes cell wall usually contains Peptidoglycan absent peptidoglycan nuclear division not by nuclear division usually chromosome or nuclear by mitosis or meiosis membrane no sexual reproduction but sexual reproduction is this process in some common bacteria flagellum has flagellum, when present characteristic 9+2 does nt have 9+2 structue structure (9 outer & 2 inner) some can fix nitrogen non can fix nitrogen e.g.-bacteria & blue green e.g.-All other plants and algae animal Prokaryotes Eukaryotes cell wall usually contains Peptidoglycan absent peptidoglycan nuclear division not by nuclear division usually chromosome or nuclear by mitosis or meiosis membrane no sexual reproduction but sexual reproduction is this process in some common bacteria flagellum has flagellum, when present characteristic 9+2 does nt have 9+2 structue structure (9 outer & 2 inner) some can fix nitrogen non can fix nitrogen e.g.-bacteria & blue green e.g.-All other plants and algae animal Common characteristic features of the algae Algae diversity range from tiny unicellular microalgae to giant seaweeds which can grow over 50 m. The are defined as unicellular or multicellular photosynthetic organisms. Algae do not possess specialized root, stem, nor vascular bundles. They lack diploid embryo stage. They lack sterile tissue around its reproductive structures. Zygote development is by mitosis or meiosis but not via embryo formation Rhodophyta ( Red Algae) General characteristic features Abundant & diverse in warm tropical and subtropical areas. Some common in temperate and polar seas. Hot springs algae – some unicellular forms. Critical role in coral reef building (encrusting, calcified corallines), consolidation role. Carbonate deposits from overlaid red algae with calcium carbonate in cell walls – global role in carbon storage. Deepest growing photosynthetic eukaryote (>210 m, Bahamas). Some parasitic forms – on macro algae (even other reds). 6,000 spp. – 97% marine, 3% freshwater,
