question_answer 18)

  Plants of this group are diploid and well adapted to extreme conditions. They grow bearing sporophylls in compact structures called cones. Thegroup in reference is (a) monocots     (b) dicots                             (c) Pteridophyta               (d) gymnosperms

Answer:

                  (d) Gymnosperms include medium sized trees or tall trees and shrubs. Leaves of these plants are well adapted to with stand extremes of temperature, humidity and wind. Reproductive organs are usually in the form of cones or strobili, The male cone are made up of microsporophyll and female cones are made up of megasporophyll, The presence of sporophyll (micro and megasporophyll) shows the development of seed habit but seeds develop from naked ovule and are not covered. Other examples are incorrect because monocots and ducats belong to angiosperms which have well developed covered seeds. Whereas, Pteridophyta do not have microsporphylls and are not adapted to the above said conditions.