Antherozoids of both funaria and pteris were released together near the archegonia of pteris. Only its sperms enter the archegonia as

Options

A. Pteris archegonia repel Funaria sperms
B. Funaria sperms get killed by Pteris sperms
C. Funaria sperms are less mobile
D. Pteris archegonia release chemical to attract its sperms

Answer

D

Explanation

(d) In Dryopteris and Pteris, when fertilisation occurs, sperms are attracted by the chemical diffusing into the water from the mucilage exuded by the open necks of archegonia of the older prothalli, some of them make their way down the canal to the egg in the venter and only one of these enters the egg to accomplish fertilisation.