Plant Morpho


Plant Morpho logoSubject: Biology    Exam: CMC Vellore

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Important Points

The mode of arrangement of petals in floral bud with respect to other members of the same whorl is known as aestivation. When there is no overlapping of margins as in Calotropis and custard-apple, it is called valvate.If one margin of an appendage overlaps that of the next one and so on as in china rose and cotton, it is twisted. There are imbricate and vexillary types of aestivations, too.

The endospermic seeds of castor and custard-apple contain an outer hard, blackish and mottled shell called testa or the seed coat. Castor seed has hygroscopic coruncle.
In basal placentation, the placenta develops at the base of the ovary and bears a single ovule as in the members of Asteraceae family.
The ovary and stigma are connected by a more or less elongated tube, the style. In polycarpellary condition, carpels may be free (apocarpous) as in lotus and rose, or united together (syncarpous) as in tomato and mustard.
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