Notebook info

Endosymbiosis describes a symbiotic relationship in which one organism resides within the cells of another organism.

Chloroplasts are organelles found in plant cells and some protists that conduct photosynthesis.
They are derived from ancestral photosynthetic bacterium.

Genes are segments of DNA responsible for specific traits and characteristics.
Heredity refers to the transmission of genetic information from parents to offspring.
Key components include:
- Genes + Alleles: Different forms of a gene.
Significant evolutionary events occurred around:
- 450 million years ago (mya): Major differentiations in plant lineages began.
- 415 mya: Evolutionary adaptations seen in traits such as carotenoids and the loss of phycoerythrin.

Key evolutionary milestones include the development of vascular tissues and leaves.
425–315 mya: The emergence of various plant structures and adaptations.

Protista consists of diverse eukaryotic organisms; they can be categorized as:
- Autotrophic (self-feeding)
- Heterotrophic (feeding on others)
- Mixotrophic (combining both strategies)

Characterized by flagellated movements.
Main groups include:
- Diplomonads: E.g., Giardia (a pathogenic organism).
- Parabasala: E.g., Trichomonas vaginalis (related to sexually transmitted infections).
- Euglenoids: Known for Euglena, which can be both photosynthetic and heterotrophic.

Organisms are typically amoeboid without cell walls.
Distinct features include
- Slender pseudopodia for movement.
- Foraminifera: Have calcium carbonate tests, providing insights into historical temperature data via isotopic analysis.

Distinct structures called alveoli present beneath the plasma membrane.
Major groups include:
- Ciliates: E.g., Paramecium, used to illustrate protozoan behavior.
- Apicomplexans: E.g., Plasmodium, responsible for malaria.
- Dinoflagellates: Some species cause harmful algal blooms (red tides).

Zygomycota: Known for black bread mold, Rhizopus.
Chytridiomycota: Often aquatic and known to be pathogenic across species.
Glomeromycota: Form endomycorrhizal relationships with plants, aiding in nutrient uptake.
Ascomycota (Sac Fungi): Produces ascospores and includes yeasts responsible for fermentation.
Basidiomycota (Club Fungi): Includes mushrooms, puffballs, and plant pathogens such as rust and smut.
Deuteromycetes: Known as imperfect fungi primarily based on asexual reproduction.

Fungi exhibit both sexual and asexual reproduction.
Asexual reproduction often involves spore formation.
Sexual reproduction involves karyogamy and meiosis, resulting in genetically diverse offspring.

Includes green plants that all exhibit characteristics such as:
- Presence of chlorophyll a and b.
- Store energy as starch.
- Have cellulose cell walls and undergo alternation of generations (the shift between sporophyte and gametophyte stages).

Bryophytes (Mosses, Liverworts, Hornworts): Early land plants adapted to moist habitats.
Lycophyta (Club Mosses): Vascular plants with microphylls.
Pteridophytes (Ferns): True vascular plants with complex leaves (fronds) and spores.
Gymnosperms and Angiosperms: Seed-producing plants undergoing further evolutionary adaptations, such as heterospory.

Adaptations to prevent desiccation include a waxy cuticle and stomata for gas exchange.
Embryo development occurs within female gametangia, providing protection and nutritional support.

Red algae (Rhodophyta) produce calcium carbonate, forming coral reefs vital for marine biodiversity.
Economic significance: Nori for sushi, agar for food thickening, and other culinary uses.

The diversity and evolutionary history of plants and fungi demonstrate complex adaptations that enabled life on land and ecological interactions with other organisms, highlighting the importance of these groups in both terrestrial ecosystems and human economies.