Why is $Adiantum$ known as the 'walking fern'?

Select the correct option for the following statements:
$(i)$ In $Dryopteris$ (fern), the prothallus is $haploid/diploid$.
$(ii)$ In $Pteridophytes$, there are $rhizoids/roots$.

Which pteridophyte is called as horse-tail?

In some of the pteridophytes and gymnosperms,the sporophylls aggregate at the apices of the main stem or its branches to form definite compact structures. These compact structures are called:

Microsporangia and megasporangia are found in the same strobilus in

Which of the following is considered an important step in the development of the seed habit?