11.7.1 Alternation of Generations: The Structure of a Flower Flashcards
1
Q
Alternation of Generations: The Structure of a Flower
A
- Flowers are the reproductive structures of the sporophyte generation of angiosperms.
- Flowers attract insects with brightly colored petals and a food source (nectar), while insects serve as pollinators for flowers. This relationship suggests the coevolution of flowers and insects.
2
Q
note
A
- One of the latest major developments in the history of plants, as seen in the phylogenetic tree on the left, was the emergence of the flowering plants about 130 million years ago.
- The flower is a reproductive structure that encloses seeds in ovaries, which serve as protective compartments.
- The majority of plants present today are flowering plants, or angiosperms.
- The anther, located on top of a long filament, is where pollen is produced. Together the anther and filament make up the male reproductive parts of the flower and are referred to as the stamen.
- The female reproductive organ of the flower is called the carpel. As seen in the diagram, the carpal consists of the stigma, style, and ovary.
- The stigma is the sticky top portion of the carpel to which pollen grains will attach. The style is the tube that leads from the stigma to the ovary. The ovary is the portion of the carpel that houses the egg-containing ovules.
3
Q
Which is the entire male reproductive structure?
A
- E
4
Q
Which label is the location where the pollen grains attach and germinate to form pollen tubes?
A
- B
5
Q
The closed vessel that contains the ovary and serves as the site where the eggs develop and the seeds mature is the
A
- carpel
6
Q
The stigma is
A
- the part of the carpel that produces nectar.
7
Q
Insects with long mouthparts pollinate long tubular flowers. Which of the following best explains this?
A
- coevolution
8
Q
The carpel is composed of
A
- ovary, style, and stigma
9
Q
Which is the structure in which the female gametophyte develops?
A
- G
