Preheat oven to 350°F. Beat cake mix, sour cream, water, eggs and extract in large bowl with electric mixer on low speed just to moisten. Beat on medium speed 3 minutes. Stir in poppy seed until well blended.
Pour into greased and floured 10-cup Bundt pan.
Bake 40 to 45 minutes or until toothpick inserted in center comes out clean. Cool in pan 10 minutes. Invert cake onto wire rack. Cool completely. Sprinkle with confectioners' sugar or drizzle with Lemon Glaze if desired.