Read Families by Their Floral Signatures
Recognise flowering-plant families by combining ovary position, placentation, stamen arrangement, perianth, fruit and seed traits.
Living-system questions are solved by matching a structure or organism to its function, process and stated condition.
Memorise diagnostic combinations
Malvaceae: epicalyx, twisted petals, monadelphous stamens and superior ovary. Brassicaceae: four petals, six tetradynamous stamens, bicarpellary superior ovary and siliqua. Liliaceae: trimerous flower, epiphyllous stamens and undifferentiated perianth. Poaceae: lodicules, spikelets and caryopsis.
Use contrasts, not one isolated trait
Fabaceae is often zygomorphic and vexillary, with a persistent calyx and non-endospermic seeds. Solanaceae typically has actinomorphic flowers, epipetalous stamens and axile placentation. Family matching questions combine several of these clues.
Match useful plants to their products
Tobacco is a fumigatory plant; gram is a pulse; onion is a vegetable; groundnut yields edible oil; tulip is ornamental.
Read a grass floral diagram
The linked floral diagram has the characteristic reduced grass-flower plan: bracts enclosing the flower, a single ovary, and three stamens. It represents Poaceae; maize and rice are both Poaceae examples. Do not match the diagram to broad petalled families such as Malvaceae or Brassicaceae.
OlympIQ exam lens
- ✓Malvaceae: epicalyx + monadelphous stamens.
- ✓Brassicaceae: tetradynamous + siliqua.
- ✓Liliaceae: trimerous + epiphyllous.
- ✓Poaceae: lodicules + caryopsis.
- ✓Tobacco—fumigatory; gram—pulse; onion—vegetable; groundnut—oil; tulip—ornamental.
Do not identify a family from stamen number alone; combine ovary, perianth and fruit clues.
Ready to try the pattern?
100% coverage across the 9 linked questions.
Practise 9 linked questions