Mycorrhizal association occurs in $Pinus$,$Ficus$ and

Where are the megasporophylls located?

In which of the following plants does the endosperm form before fertilization?

During which geological period did the order $Gnetales$ of gymnosperms evolve?

Each plant or group of plants has some phylogenetic significance in relation to evolution. $Cycas$,one of the few living members of gymnosperms,is called the 'relic of the past'. Can you establish a phylogenetic relationship of $Cycas$ with any other group of plants that justifies the above statement?

The number of prothallial cells in the male gametophyte of Cycas is: