Pollination and Fertilization

Flashcards covering key concepts from the Pollination and Fertilization notes, including autogamy, geitonogamy, allogamy, pollination agents, pollen grain structure, and the processes of fertilization (double fertilization and triple fusion).

What is pollination?

Transfer of pollen grains from the anther to the stigma.

What is autogamy?

Self-pollination where pollen from the same flower falls on its own stigma.

What is geitonogamy?

Pollen from another flower of the same plant lands on the stigma.

What is allogamy?

Pollen from another plant of the same species lands on the stigma; cross-pollination.

Name the agents of pollination mentioned in the notes.

Wind, insects, and water (and other agents).

What is cross-pollination?

Pollination from a flower of one plant to the stigma of a flower of another plant of the same species.

What does a pollen grain contain that participates in reproduction?

Two sperm nuclei.

What must happen first for pollination to initiate fruit and seed formation?

Pollen grains must reach the stigma.

What events occur between pollination and fertilization leading to zygote formation?

Pollen grain germinates on the stigma; pollen tube grows through the style to the ovule; sperm nuclei reach the embryo sac.

What is double fertilization?

In angiosperms, one sperm fertilizes the egg to form the zygote, while the other sperm fuses with two polar nuclei to form the triploid endosperm.

What is triple fusion?

Fusion of the second sperm with the two polar nuclei to form the endosperm.

What are the primary products of double fertilization?

A zygote and a triploid endosperm.