Key Points
Key Points: Kingdom Plantae
1. Meaning- All eukaryotic, chlorophyll-containing organisms; cell wall made of cellulose; mostly autotrophic; some are insectivorous (e.g. Venus fly trap, Bladderwort) or parasitic (e.g. Cuscuta).
2. Members - Includes algae, bryophytes, pteridophytes, gymnosperms and angiosperms.
3. Alternation of generations - Life cycle has two phases - diploid sporophyte and haploid gametophyte - which alternate with each other.
4. Plant groups at a glance:
- Algae - Simple, aquatic, no true roots/stems/leaves. e.g. Seaweed, Green algae
- Bryophytes - Non-vascular, moist environments. e.g. Mosses, Liverworts
- Pteridophytes - Vascular, no seeds, reproduce by spores. e.g. Ferns
- Gymnosperms - Naked seeds in cones, no flowers/fruits. e.g. Pine, Fir
- Angiosperms - Seeds enclosed in fruits, the most diverse group. e.g. Rose, Lily
5. Key features - Have prominent chloroplasts for photosynthesis; membrane-bound organelles; the most diverse group among all kingdoms.
Key Points: Division I - Thallophyta
- Thallophyta have a simple thallus body and lack true roots, stems, and leaves.
- They do not have vascular tissues, so transport of water and nutrients is simple.
- They are mostly found in moist environments like freshwater, marine, and damp areas.
- Reproduction occurs by asexual methods such as fragmentation and spore formation.
- They show wide diversity, ranging from microscopic forms to large multicellular seaweeds, and may form symbiotic associations (e.g., lichens).
