Flowers ans

 1)  spores

 2)  sporophyte-meiosis-gametophyte-gametes-fertilization-diploid zygote

 3)  Meiosis occurs in sporophytes to produce spores.

 4) a small (reduced) sporophyte.

 5) receptacle

 6)  sepal.

 7)  stamen carpel

 8)  stamen carpel

 9)  sepals-petals-stamens-carpels

 10)  photosynthesis.

 11) style.

 12) It has both stamens and carpels.

 13) develop into fruits.

 14) dioecious

 15) anther.

 16)  microsporocyte  

 17) megasporocyte and microsporocyte

 18) meiosis-pollination-nuclear fusion-formation of embryo and endosperm

 19)  anther—gametophyte

 20)  microsporocyte-meiosis-microspores-mitosis-two haploid cells per pollen grain

 21)  A megaspore mother cell undergoes meiosis.

 22)  mitosis in male gametophytes

 23) embryo sac—female gametophyte

 24)  pollen grain

 25) two sperm nuclei and one tube cell nucleus.

 26) three antipodal cells, two polar nuclei, one egg, and two synergids.

 27)  central cell.

 28)  introduction of genes into a plant that prevent its seeds from maturing

 29) leaves.

 30) double fertilization

 31) Pollination brings gametophytes together so that fertilization can occur.

 32) the rejection of self cells.

 33)  genetic variation

 34)  It produces clones.

 35)  Making cuttings of ornamental plants is a form of fragmentation.

 36)  form a seed coat

 37)  one or more seeds. the ovary wall.

 38) mature ovary.

 39)  imbibition

 40) Both a diploid embryo and triploid endosperm are formed.

 41)  It develops from the fertilized egg.

 42) proembryo and the cotyledons.

 43) It forms the suspensor that anchors the embryo.

 44)  radicle

 45) wind-pollinated

 46) male gametophyte; embryo sac

 47) an ovule.

 48)  ovaries.

 49) imbibition of water.

 50) obtain a dependable water supply.

 51)  graft varietal Burgundy grape scions onto native (Californian) root stocks.

52) increasing crop yield.