Select the correct option for the tallest plants among the following groups:
Gymnosperms $\quad\quad$ Angiosperms

The largest ovules,largest male and female gametes,and the largest plants are found in ........

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?

Which of the following statements is incorrect regarding $Cycas$?

In which of the following is water $NOT$ required for fertilization?

The tallest living tree in the world is ........