1. in a real garden, which hormones would stimulate seed germination and plant growth?

The hormone is gibberellins.

Explanation:

The chemical substance which is involved in plant growth and development is called as plant hormones. The most commonly known examples are auxin, gibberellin, ethylene, absicisc acid, etc.

Each hormone is function specific. In case of a real garden hormone gibberellin stimulates germination of seed and growth of plants. Gibberellins (GAs) are plant hormones that direct different formative procedures, including stem lengthening, germination, lethargy, blooming, blossom advancement, and leaf and organic product senescence. GAs are one of the longest-known classes of plant hormone.

cell regulation is conducted by special proteins.