Plant Kingdom Flashcards
(12 cards)
What are the main characteristics of algae?
Chlorophyll-bearing, simple, thalloid, autotrophic, largely aquatic
Algae can be found in fresh water, marine environments, and various other habitats such as moist stones, soils, and wood.
What is the significance of phylogenetic classification systems?
They are based on evolutionary relationships and assume common ancestry among organisms
This classification helps resolve difficulties when there is no supporting fossil evidence.
What is numerical taxonomy?
A method that assigns numbers and codes to observable characteristics for classification
It allows for the processing of hundreds of characters with equal importance.
What does cytotaxonomy focus on?
Cytological information like chromosome number, structure, and behavior
It helps taxonomists resolve classification confusions.
What is chemotaxonomy?
A classification method using the chemical constituents of plants
It helps clarify taxonomic relationships among species.
What are the methods of reproduction in algae?
Vegetative, asexual, and sexual methods
Vegetative reproduction occurs by fragmentation, while asexual reproduction often involves zoospores.
What is vegetative reproduction in algae?
Reproduction by fragmentation where each fragment develops into a thallus
This allows for rapid population growth in favorable conditions.
What type of spores are commonly produced in asexual reproduction of algae?
Zoospores
Zoospores are flagellated and motile, leading to new plant growth upon germination.
Define isogamous reproduction in algae.
Fusion of two gametes that are similar in size, either flagellated or non-flagellated
An example is Ulothrix, where both gametes are flagellated.
What is anisogamous reproduction?
Fusion of two gametes that are dissimilar in size
An example includes species of Eudorina.
What characterizes oogamous reproduction in algae?
Fusion between a large, non-motile female gamete and a smaller, motile male gamete
Examples of oogamous reproduction can be seen in Volvox and Fucus.
Give examples of colonial and filamentous forms of algae.
- Colonial: Volvox
- Filamentous: Ulothrix, Spirogyra
These forms highlight the diversity in the structure of algae.
