Is my dichotomous key correct?

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      cactus
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      Hi all
      For an assignment I am required to create a dichotomous key for six fruits. They are: Apple, Pear, Orange, Banana and Strawberry. Here is the key I created:

      1a, Spherical shape…………………….. 2
      1b, Aspheric shape ……………………… 3

      2a, Thin skin………………………………….. Apple
      2b, Thick skin………………………………….. Orange

      3a, Seed bearing…………………………… 4
      3b, Seedless………………………………….. 5

      4a, External seeds………………………….. Straw berry
      4b, Internal seeds……………………………… Pear

      5a, Elongated shape………………………… Banana
      5b, Scaly skin …………………………………… Pineapple

      I am not sure if this is correct or not. I am not sure because I am quite new to this.
      Help would be much appreciated!
      Thanks,
      Sam
      cactus

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