The spur of $Pinus\ occelsa$ is

Which one of the following is a living fossil?

In gymnosperms,the leaves are well-adapted to withstand extremes of temperature,humidity,and wind. What are the xeric characters in conifers?

The pollination in $Pinus$ is

Besides paddy fields,cyanobacteria are also found inside the vegetative part of

Early embryogeny in $Cycas$ is characterized by