Answer:

What part of a plant produces a new plant?

Seeds are what a plant uses to spread new plants into new places. Each seed contains a tiny plant called an embryo, which has root, stem and leaf parts ready to grow into a new plant when conditions are right. After fertilisation, a tiny plant called an embryo is formed inside a seed.

A stem cutting includes a piece of stem plus any attached leaves or buds. Thus, the stem cutting only needs to form new roots to be a complete, independent plant. A leaf cutting uses just the leaf, so both new roots and new stems must be formed to create a new plant.