Simulation · Biology · Class 11
Where do the ovules sit?
"Where do the ovules sit?" is a free, interactive Class 11 Biology simulation for NEET, built on the lesson "Gynoecium and placentation" in Morphology of Flowering Plants. Pick each type of placentation. The orange tissue is the placenta; the white dots are ovules. Note how many chambers each ovary has. Marginal: pea. Axile: china rose, tomato, lemon. Parietal: mustard, Argemone. Free central: Dianthus, Primrose. Basal: sunflower, marigold.
From the lesson Gynoecium and placentation in Morphology of Flowering Plants. Change the values and watch what happens.
Where do the ovules sit?Biology · Class 11
The idea behind it
NCERT §5.5.1.4, Figure 5.12
- The gynoecium is the flower's female reproductive part, made of one or more carpels.
- A carpel has three parts: the ovary (the enlarged base), the style (a long tube above it) and the stigma (usually at the tip of the style), which is the surface that receives pollen.
- Each ovary carries one or more ovules attached to a flat, cushion-like placenta.
- Apocarpous: two or more carpels that stay free, as in lotus and rose. Syncarpous: carpels fused, as in mustard and tomato.
- After fertilisation the ovules become seeds and the ovary ripens into a fruit.
- Placentation is the arrangement of ovules inside the ovary.
- Marginal: the placenta is a ridge along the ventral suture and the ovules sit on it in two rows. Example: pea.
- Axile: a multilocular ovary with the placenta along its central axis, carrying the ovules. Examples: china rose, tomato, lemon.
- Parietal: ovules grow on the inner wall of the ovary. The ovary is one-chambered but becomes two-chambered by a false septum. Examples: mustard, Argemone.
- Free central: ovules on a central axis with no septa (Dianthus, Primrose). Basal: the placenta is at the base of the ovary and bears a single ovule (sunflower, marigold).
Questions
2 answers
- What does the "Where do the ovules sit?" simulation show?
- Pick each type of placentation. The orange tissue is the placenta; the white dots are ovules. Note how many chambers each ovary has.
- Is this simulation free?
- Yes. It is free and runs in the browser on a phone or a laptop. It belongs to the lesson "Gynoecium and placentation" in Morphology of Flowering Plants (Class 11 Biology).
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