question_answer 25)

  From among the sets of terms given below, identify those that are associated with the gynoecium. (a) Stigma, ovule, embryo sac, placenta                                 (b) Thalamus, pistil, style, ovule (c) Ovule, ovary, embryo sac, tapetum                  (d) Ovule, stamen, ovary, embryo sac

Answer:

                  (a)the gynoecium represents the female reproductive part of the flower and consists of pistil. Each pistil has three parts, i.e., stigma, style and ovary. Inside the ovarian cavity, the placenta is located. Arising from the placenta there are the mega sporangia, commonly called ovules. The functional megaspore undergoing the meiotic division develops into the female gametophyte or embryo sac. In option 'b? thalamus is not a part of gynoecium. Thalamus is the part of flower which form the base on which all the floral whorls rest upon, it is not associated with gynoecium. In option 'c' tapetum is not a part of gynoecium. Tapetum is the inner most nutritive layer or microsporangium and in option? d'stamens not a part of gynoecium. Stamen is male reproductive part (androecium) of plant. Therefore, the other options are wrong.