Simulation · Biology · Class 11
Set the petals in the bud
From the lesson Calyx, corolla and aestivation in Morphology of Flowering Plants. Change the values and watch what happens.
Set the petals in the budBiology · Class 11
The idea behind it
NCERT §5.5.1.1, §5.5.1.2, Figure 5.11
- Calyx: the outermost whorl, made of sepals. Sepals are usually green and leaf-like and protect the flower while it is a bud.
- Gamosepalous: sepals united. Polysepalous: sepals free.
- Corolla: made of petals, whose bright colours usually serve to draw insects in for pollination. Gamopetalous: petals united. Polypetalous: petals free.
- Corolla form varies a great deal. Common shapes: a tube (tubular), a bell, a funnel, or a flat wheel.
- Aestivation is the way sepals or petals lie in the bud relative to their neighbours in the same whorl. Main types: valvate, twisted, imbricate, vexillary.
- Valvate: neighbouring members just meet at their edges and do not overlap. Example: Calotropis.
- Twisted: each member overlaps the next one with one margin, all the way round in one direction. Examples: china rose, lady's finger, cotton.
- Imbricate: the margins overlap, but with no single direction. Examples: Cassia, gulmohur.
- Vexillary or papilionaceous (pea, bean): five petals; the largest, the standard, overlaps the two lateral wings, and the wings overlap the two smallest anterior petals, the keel.