A figure shows three flowers in longitudinal section. In I the ovary is at the highest position on the thalamus, and the other floral parts arise below it. In II the ovary is in the centre, and the other parts arise from the rim of the thalamus at almost the same level as the ovary. In III the margin of the thalamus grows upward, encloses the ovary completely and fuses with it, and the other parts arise above the ovary. Which pairing of a figure with an example is correct?
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I is hypogynous (superior ovary), II is perigynous (half-inferior ovary) and III is epigynous (inferior ovary). Guava, cucumber and the ray florets of sunflower are epigynous, and plum, rose and peach are perigynous.
- A.
Plum has a perigynous flower like II. I is a hypogynous flower, as in mustard, china rose and brinjal.
- B.
Cucumber has an epigynous flower with an inferior ovary, like III, not a perigynous one.
- C.
The ray florets of sunflower are epigynous, like III. In I the ovary is superior.
NCERT: Class 11 Biology, Chapter 5