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Sexual Reproduction in Flowering Plants — Class 12 CBSE Biology revision notes

A 6-page visual revision sheet for Sexual Reproduction in Flowering Plants, written for Class 12 CBSE Biology. Formulas, diagrams and the traps that cost marks, laid out to be read the night before rather than the term before. Free, and it opens inside CapCompass.

Page 1 as PDF

Sexual Reproduction in Flowering Plants in one look

one pollen tube, two fusions, one seed

Androecium vs Gynoecium

Androecium (male)

• a stamen = filament + anther
• each anther is bilobed, 4 microsporangia (pollen sacs) total, 2 per lobe

Gynoecium (female)

• a pistil = stigma + style + ovary
• ovary holds one or more ovules, attached at the placenta

Anther and pollen sac wall

• each microsporangium is wrapped in 4 wall layers: epidermis, endothecium, middle layers, and the innermost tapetum
• the tapetum nourishes the developing pollen grains and is used up by the time the pollen matures
• as the anther matures, the microsporangium becomes the pollen sac, packed with pollen grains

1. Pollen mother cell: one of the many sporogenous cells filling each microsporangium
2. Microspore tetrad: PMC divides, four haploid microspores held together
3. Pollen grain: microspores separate out, wall layers develop

Page 1 of 6. The full sheet, all 6 pages, opens free in the app.

What this Sexual Reproduction in Flowering Plants sheet covers

• Androecium vs Gynoecium
• Androecium (male)
• Gynoecium (female)
• The four whorls, in section
• Anther and pollen sac wall
• Pollen mother cell
• Microspore tetrad
• Pollen grain
• The ovule, walked stalk to tip
• Pollen grain structure
• Pollen viability and storage
• Megaspore mother cell
• Megaspore tetrad
• Embryo sac
• Parts of a typical ovule
• Funicle
• Hilum
• Micropyle
• Chalaza
• Integument(s)
• Nucellus
• The mature embryo sac: 7 cells, 8 nuclei
• Egg apparatus vs Antipodal cells
• Egg apparatus
• Antipodal cells
• Self-pollination vs Cross-pollination
• Self-pollination
• Cross-pollination
• Agents of pollination
• Anemophily
• Entomophily
• Hydrophily
• Zoophily, more broadly
• Outbreeding devices
• Pollen-pistil interaction
• True fruit vs False fruit
• True fruit
• False fruit (pome)
• Apomixis and polyembryony
• Pollen tube's final stretch
• Pollen tube
• 2 male gametes
• Double Fertilisation
• Double Fertilization
• Syngamy vs Triple fusion
• Syngamy
• Triple fusion
• Post-fertilization events
• Traps that cost marks
• Tricks that save time

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More Biology Class 12 revision notes

• Biodiversity and Conservation
• Biotechnology and its Applications
• Biotechnology: Principles and Processes
• Ecosystem
• Evolution
• Human Health and Disease
• Human Reproduction
• Microbes in Human Welfare
• Molecular Basis of Inheritance
• Organisms and Populations
• Principles of Inheritance and Variation
• Reproductive Health