Question

Refer to the given flow chart regarding different groups of Kingdom Plantae.

Which of the following is true regarding P, Q, R, S and T ?

• A. Examples of group 'P' include Riccia, Marchantia, Sphagnum, etc
• B. Members of group 'R' can be both homosporous as well as heterosporous
• C. Group 'Q' includes seedless vascular plants having sporophytic plant body
• D. Group 'S' is more ancient than group 'T' and formed a dominant vegetation on Earth some 200 million years back in mesozoic era

Answer 1

Answer: (C)

Cryptogams are the plants without seeds. In the given flow chart, 'P' represents algae in which sex organs are usually unicellular and non-jacketed. 'Q′ represents pteridophytes, in which both sporophytic and gametophytic generations are independent. In pteridophytes, the main plant body is sporophyte which is differentiated into true root, stem and leaves. 'R' represents bryophytes in which diploid sporophyte lives as a parasite on an independent haploid gametophyte. All known members of bryophytes have been found to be homosporous. 'S' and 'T' respectively represent angiosperms and gymnosperms, which are included under phanerogams. Gymnosperms evolved earlier and thus are more ancient than angiosperms. Gymnosperms formed dominant flora on Earth about 200 million years ago in the mesozoic era.