Which one of the following statements is not correct?

• A
  Offspring produced by asexual reproduction are called clones.
• B
  Microscopic,motile,asexual reproductive structures are called zoospores.
• C
  In potato,banana,and ginger,the plantlets arise from the internodes present in the modified stem.
• D
  Water hyacinth,growing in standing water,drains oxygen from water,which leads to the death of fishes.