Lesson 6: Angiosperm Reproduction

Complete Flower

A flower that has all four distinct whorls.

Incomplete Flower

A flower that lacks one or more whorls.

Calyx

The outermost whorl that protects the flower bud.

Corolla

The part of the flower that attracts pollinators.

Androecium

The male structures of a flower, including stamens.

Gynoecium

The female parts of a flower, consisting of carpels containing ovules.

Bilateral Symmetry

A more advanced symmetry compared to radial symmetry in flowers.

Alternation of Generations

Lifecycle characteristic of plants that includes sporophyte and gametophytes.

Micro gametophytes

Pollen grains, representing the male gametophytes.

Mega gametophytes

Embryo sac, representing the female gametophyte.

Pollination

The transfer of pollen to the stigma.

Self-Pollination

Pollen transfer from the same flower or plant.

Cross-Pollination

Pollen transfer involving different individuals.

Monoecious

A plant that has separate male and female flowers on the same plant.

Dioecious

Plants that have male flowers on one plant and female flowers on another.

Self-Incompatibility

A mechanism that blocks pollen tube growth to promote outcrossing.

Double Fertilization

A process in angiosperms resulting in a diploid zygote and triploid endosperm.

Seed and Fruit Development

Ovary develops into fruit, aiding seed dispersal; seed coat forms from ovule coverings.

Dispersal Strategies

Methods including ingestion by animals and wind dispersal.

Asexual Reproduction

Allows for the production of genetically identical offspring.