Page 32 - Biology - XII
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C.  Sunfl ower (Helianthus annus)


                                                                                                   Flower




                                                                                                    Leaf





                                                                                           Stem

                  Fig. 6.9 (a):  Sunfl ower (Pictorial)                     Fig. 6.9 (b):  Sunfl ower (Diagrammatic)

          Comments


           1.  It is the fl ower of Helianthus annus (Vern. Surajmukhi) sunfl ower.
           2.  Flower is yellow, large with two fl orets. The disc fl orets are central, tubular, and complete. Ray fl orets
              are marginal, unisexual, and incomplete.
           3.  Gynoecium is two, style single and stigma bifi d.


                                                          SPOT - 3


          Flowers Adapted to Pollination by Birds (Ornithophilous Flowers)
           A.  Bignonia capreolata Flowers






















                Fig. 6.10 (a):  Bignonia capreolata               Fig. 6.10 (b):  Bignonia (Diagrammatic)


          Comments

               1.  Flowers are big in size.
               2.  These fl owers produce nectar.

               3.  Tiny birds visit the fl owers to feed on nectar.








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