4. Are soybean plants generally taller when CO 2 levels are high? 1. It is important to note that some varieties are taller than others. 2. It is true that all varieties are taller. 3. The height of each variety differs, but the effect is the same. 6. A controlled lab environment was used to grow the peas in the data above. Assuming the data were grown naturally, how would they look? 1. In the lab experiment, the results were the same. 2. Less variation than in the lab experiment. 3. Resulting in more variation than in the lab experiment. Chlorophyll a in mature seed coat Chlorophyll b in mature seed coat .