1) All of the following are examples of an asexual reproduction except a) Cloning technique b) Forming zygots
c) Runners technique I
d) Tuber technique in the potato

b) Forming zygots

Explanation:  

A zygote can be defined as a eukaryotic cell formed by the fusion of gametes during sexual reproduction. In general, a zygote is a diploid (2n) cell produced by the fusion of two haploid (n) gametic cells (eg., in mammals, sperm and egg cells). In multicellular organisms, the zygote is the first stage of development, which will give rise to an adult organism as it divides and grows. A zygote cell can be considered as a pluripotent stem cell because it differentiates into all cell types.

the answer is d. none of the above