Classify the following as either sexual or asexual reproduction. And give the specific type if asexual. Pollen from a male poplar tree fertilizes sex cells on a female poplar tree.

Sexual reproduction

Explanation:

Sexual reproduction is defined as the process in which male gamete combine with female gamete to form a new organism.

The given example is a type of sexual reproduction as it involves two different  sexes a male poplar tree and a female poplar tree, and pollens from male poplar tree transfers to the sex cells on a female poplar tree result in the process of fertilization.

Hence, the correct answer is "Sexual reproduction".