Question

the ceramical attractant which directs the Pollen tube to enter the ovary to rough microphyle is​

Answer 1

Answer:

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Answer 2

Answer:

Two molecules have been reported to be candidates for pollen tube attractants that are derived from the synergid cells. One is the external calcium ion. In vitro test results suggest that calcium is an attractant derived from the pistil, in particular the ovule (Mascarenhas and Machlis, 1962, 1964; Reger et al., 1992).