The Flower, the Stamen and the Male Gametophyte

Name: The Flower, the Stamen and the Male Gametophyte
Author: StemPy Lab

What is inside a flower, and how does it make pollen? You open the anther, study the layers of its wall, and follow the cells that divide to form pollen grains. Then you look at one pollen grain closely and see why it counts as a male gametophyte. It serves the Indian syllabus (NCERT, NEET) and the matching topic of A-Level, IB and AP.

3 lessons, about 1 h 20 min3 simulations12 problems3 practice questionsPython in every lesson

Created by StemPy Lab

Course outline (3 lessons)

Lesson 1about 30 min
The flower and the structure of the anther
A flower is the part of a flowering plant that makes seeds. Its male part is the stamen, and the anther at the top of the stamen is where pollen is made. In a cross section a typical anther is four-sided, with four pollen sacs. Each sac has a wall of four layers around a centre of cells that will become pollen.
1 simulation1 practice question1 Python program4 problems
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Lesson 2about 25 min
Microsporogenesis: from sporogenous tissue to pollen
Each cell of the sporogenous tissue can become a pollen mother cell. A pollen mother cell divides by meiosis and makes four microspores, which stay together as a tetrad. As the anther dries, the four separate. Each microspore becomes a pollen grain. This lesson counts the cells and the chromosomes at each step.
1 simulation1 practice question1 Python program5 problems1 Python lab
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Lesson 3about 25 min
The pollen grain as the male gametophyte
A pollen grain is a haploid structure that makes the male gametes, so it is called the male gametophyte. It is about 25 to 50 micrometres wide. Its outer wall, the exine, is made of sporopollenin, one of the toughest organic materials known, and has gaps called germ pores. Its inner wall, the intine, is made of cellulose and pectin.
1 simulation1 practice question1 Python program3 problems1 Python lab1 question set1 note
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The Stamen and the Pollen Grain: Practice Paper

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The Flower, the Stamen and the Male Gametophyte

Course outline (3 lessons)

The flower and the structure of the anther

Microsporogenesis: from sporogenous tissue to pollen

The pollen grain as the male gametophyte

Test Your Learning

Your teacher

Discussion (0)