Simulation · Biology · Class 11
Where do the other whorls join?
"Where do the other whorls join?" is a free, interactive Class 11 Biology simulation for NEET, built on the lesson "Ovary position on the thalamus" in Morphology of Flowering Plants. Switch between the three flowers. Watch where the sepals, petals and stamens are attached compared with the ovary, and how the thalamus is shaped. Hypogynous, superior: mustard, china rose, brinjal. Perigynous, half inferior: plum, rose, peach. Epigynous, inferior: guava, cucumber, ray florets of sunflower.
From the lesson Ovary position on the thalamus in Morphology of Flowering Plants. Change the values and watch what happens.
Where do the other whorls join?Biology · Class 11
The idea behind it
NCERT §5.5, Figure 5.9
- Flowers are classed by where the calyx, corolla and androecium sit on the thalamus compared with the ovary: hypogynous, perigynous or epigynous.
- Hypogynous: the gynoecium is at the top and every other part is attached below it. The ovary is superior. Examples: mustard, china rose, brinjal.
- Perigynous: the gynoecium is in the centre and the other parts sit on the rim of the thalamus at nearly the same level. The ovary is half inferior. Examples: plum, rose, peach.
- Epigynous: the margin of the thalamus grows up around the ovary, encloses it fully and fuses with it, so the other parts arise above the ovary. The ovary is inferior. Examples: guava, cucumber and the ray florets of sunflower.
- Superior, half inferior and inferior describe the ovary; hypogynous, perigynous and epigynous describe the flower. The terms come in matched pairs.
- Quick check: if you see the sepals and petals attached on top of the ovary, as at the crown of a guava fruit, the ovary was inferior.
Questions
2 answers
- What does the "Where do the other whorls join?" simulation show?
- Switch between the three flowers. Watch where the sepals, petals and stamens are attached compared with the ovary, and how the thalamus is shaped.
- Is this simulation free?
- Yes. It is free and runs in the browser on a phone or a laptop. It belongs to the lesson "Ovary position on the thalamus" in Morphology of Flowering Plants (Class 11 Biology).
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