biology 24.1
Post on 14-May-2015
894 Views
Preview:
TRANSCRIPT
CH. 24-1 REPRODUCTION WITH CONES AND FLOWERSCh. 24 Reproduction of Seed Plants
Pollen Cone
Cone in gymnosperms that produces male gametophytes in the form of pollen grains
Seed Cone
Cone that produces female gametophytes
Ovule
Structure in seed cones in which female gametophytes develop
Pollen Tube
Structure grown y a pollen grain; contains two haploid sperm nuclei
Sepal
Outermost circle of flower parts that encloses a bud before it opens and protects the flower while it is developing
Petal
Brightly colored structure just inside the sepals; attracts insects and other pollinators to a flower
Stamen
Male part of the flower; made up of an anther and a filament
Filament
Long thin structure that supports an anther
Anther
Flower structure in which haploid male gametophytes are produced
Carpel
Innermost part of a flower that produces the female gametophytes
Ovary
In a flower structure that contains one or more ovules from which female gametophytes are produced
Style
Narrow stalk of the carpel in a flower
Stigma
Sticky portion at the top of the style where pollen grains frequently land
Embryo Sac
Female gametophyte within the ovule of a flowering plant
Endosperm
Food-rich tissue that nourishes a seedling as it grows
Double Fertilization
Fertilization in angiosperms, in which two distinct fertilization events take place between the male and female gametophytes.
Key Concepts
Reproduction in gymnosperms takes place in cones, which are produced by a mature sporophyte plant.
Key Concepts
Flowers are reproductive organs that are composed of four kinds of specialized leaves: sepals, petals, stamens, and carples.
Key Concepts
Reproduction in angiosperms takes place within the flower. Following pollination and fertilization, the seeds develop inside protective structures.
Key Concepts
Most gymnosperms and some angiosperms are wind pollinated whereas most angiosperms pollinated by animals
top related