10 Questions
Which characteristic is true for Thallophyta plants?
Plant body is thallus in nature
Which of the following algae have chlorophyll a and b type?
Green Algae
In Thallophyta, what type of reproduction involves the fusion of two gametes?
Sexual reproduction
Which type of algae has zoospores absent?
Gelidium
What is the reserve food in Brown Algae?
Laminarin
Which of the following algae have cell walls containing algin?
Red Algae
What is the economic importance of Laminaria and Ascophyllum?
Both a and c
Which algae are mostly found in marine environments?
Red Algae
Volvox exhibits which type of sexual reproduction?
Oogamous
Thallophyta plants lack which of the following structures?
Roots, stems, and leaves
Study Notes
Thallophyta
- Comprises simplest plants with undifferentiated or thallus-like forms and single reproductive organs called gametangia
- Includes only algae
Characteristics of Algae
- Plant body is thallus, which can be unicellular, colonial, filamentous, or parenchymatous
- Vascular tissues and mechanical tissue are absent
- Reproduction occurs through: • Vegetative fragmentation • Asexual spore formation (zoospores) • Sexual reproduction by fusion of two gametes
Types of Algae
- Chlorophyceae (Green Algae) • Found in freshwater and subaerial environments • Chlorophyll a and b type • Reserve food is starch • Cell wall is of cellulose • Examples: Chlamydomonas, Ulothrix, Spirogyra
- Phaeophyceae (Brown Algae) • Found in marine environments • Chlorophyll a and c type • Reserve food is laminarin • Cell wall contains cellulose and algin • Examples: Sargassum, Ectocarpus
- Rhodophyceae (Red Algae) • Found in marine environments • Chlorophyll a and b type • Reserve food is floridean starch • Cell wall contains cellulose and poly-sulphate esters • Examples: Polysiphonia, Gelidium, Porphyra
Economic Importance of Algae
- Used as food in some countries (e.g., Laminaria, Sargassum)
- Rich source of iodine (e.g., Fungus, Laminaria)
- Antibiotic properties (e.g., Laminaria, Ascophyllum)
Learn about Thallophyta, the simplest plants including algae, with undifferentiated forms and reproductive organs like gametangia. Explore the characteristics of algae, such as thallus structure and methods of reproduction.
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