Based on the position of floral parts on thalamus name the types of flower in brinjal

ADVERTISEMENTS: In this article we will discuss about the thalamus of a flower. The thalamus is the short abbreviated axis bearing the four sets of floral leaves. It is the swollen end of the peduncle or pedicel with four nodes and very much compressed internodes. The floral leaves remain inserted on the nodes in whorls or spirally. The axis nature of the thalamus be­comes quite evident in some flowers in which it (thalamus) is considerably long and the internodes are distinct. ADVERTISEMENTS: The internode between the calyx and corolla is known as anthophore, that between corolla and androecium is androphore, and the one between androecium and gynoecium is gynophore. Androphore is distinct in passion-flower and gynophore in Pterospermum (B. Kanak champa). In Gynandropsis (B. Hurhure) both androphore and gynophore develop to form what is known as gynandrophore (Fig. 85). The thalamus may be a bit elongated, as in Michelia (B. Champaka), convex in flowers like China-rose, Datura, cup-shaped in roses, and it may have spongy flat top, as in lotus. According to the nature of the thalamus and mode of inser­tion of the first three floral sets with respect to the gynoecium, flowers may be hypogynous, perigynous and epigynous (Fig. 86). Hypogynous flower is that in which the thalamus is convex and dome-shaped, and the pistil occupies the top position of the thalamus, other whorls remaining inserted below the pistil one after another in normal order. The ovary here is called superi...

On the basis of relative position of different floral parts on the thalamus, a flower can be hypogynous, perigynous or epigynous. With respect to the given figures A, B, C and D, select the correct option.4 A 8 A B C D A Hypog ynous Perigyn ous Perigyn ous Epigyn ous B Hypog ynous Epigyn ous Perigyn ous Perigyn ous C Epigy nous Hypogy nous Perigyn ous Perigyn ous D Hypog ynous Hypogy nous Perigyn ous Epigyn ous *CD The correct option is A A Based on the position of calyx, corolla and androecium with respect to the ovary on thalamus, the flowers are described as hypogynous, perigynous and epigynous. In the hypogynous flower, the gynoecium occupies the highest position while the other parts are situated below it. So figure A is hypogynous. If gynoecium is situated in the centre and other parts of the flower are located on the rim of the thalamus almost at the same level, it is called perigynous. So figure B and C is perigynous. In epigynous flowers, the margin of thalamus grows upward enclosing the ovary completely and getting fused with it, the other parts of flower arise above the ovary. So figure D is epigynous.