The Female Gametophyte, Pollination and Pollen-Pistil Interaction

Name: The Female Gametophyte, Pollination and Pollen-Pistil Interaction
Author: StemPy Lab

How does an ovule make an egg, and how does pollen reach it? You study the pistil and the ovule, and follow the cell that divides to make the seven-celled embryo sac. Then you meet the kinds and agents of pollination, the devices that prevent self-pollination, and the dialogue between pollen and pistil. It serves the Indian syllabus (NCERT, NEET) and the matching topic of A-Level, IB and AP.

3 lessons, about 1 h 30 min3 simulations12 problems3 practice questionsPython in every lesson

Created by StemPy Lab

Course outline (3 lessons)

Lesson 1about 30 min
The pistil, the ovule and the embryo sac
The female part of the flower is the pistil, with a stigma, a style and an ovary. The ovary holds ovules, and each ovule is a megasporangium. One cell of the ovule, the megaspore mother cell, divides by meiosis into four megaspores. Only one survives. Its nucleus divides three times to make the embryo sac, which is seven-celled and eight-nucleate.
1 simulation1 practice question1 Python program5 problems1 Python lab
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Lesson 2about 30 min
Pollination: kinds and agents
Pollination is the transfer of pollen from the anther to the stigma. It is autogamy when the pollen stays in the flower. It is geitonogamy when the pollen goes to another flower of the same plant. It is xenogamy when the pollen goes to another plant. Wind, water or animals carry the pollen, and each has its own flower features.
1 simulation1 practice question1 Python program4 problems1 Python lab
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Lesson 3about 30 min
Outbreeding, the pollen-pistil interaction and hybridisation
Continued self-pollination leads to inbreeding, so flowering plants use outbreeding devices: a difference in timing, a difference in position, self-incompatibility and unisexual flowers. After pollination, the pistil decides whether to accept the pollen. An accepted grain grows a tube down the style to the ovule, where the tube enters through the micropyle and a synergid.
1 simulation1 practice question1 Python program3 problems1 question set1 note
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Test Your Learning

Pollination and the Embryo Sac: Timed Test

20 questions · 15 min

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The Female Gametophyte, Pollination and Pollen-Pistil Interaction

Course outline (3 lessons)

The pistil, the ovule and the embryo sac

Pollination: kinds and agents

Outbreeding, the pollen-pistil interaction and hybridisation

Test Your Learning

Your teacher

Discussion (0)