The first question is simple. It must be a sunflower. 2 minutes can have 150 (excluding 2 minutes) or 175 (including those generated within 2 minutes).

The key to the second question is to choose plants, and there are four schemes:

One sunflower, another in 40 seconds. Two sunflowers produce 80 seconds, 200 minutes or 250 minutes.

A sunflower, after 20 seconds, plants sunshine mushrooms. Sunflower yield 125 or 150, sunshine mushroom 75 or 100.

Sunshine mushrooms, 20 seconds to plant sunflowers. Sunflower yield 125 or 150, sunshine mushroom 100 or 125.

Two sunshine mushrooms make 200 or 250 points in two minutes.

So plan three should be the best.