Final answer:
We cannot conclusively determine the effect of water on sunflower growth from Krista's investigation without specific data. Sunflowers generally grow best with consistent and moderate watering, but effects depend on various conditions.
Step-by-step explanation:
Based on the information provided about Krista's investigation, we cannot conclude precisely what the effect of water on sunflower growth is without reviewing Krista's recorded data. It is known that sunflowers typically require sufficient and regular water to grow properly and that both overwatering and underwatering can adversely affect their growth. Overwatering can lead to waterlogged soils which become anaerobic, causing poor growth or death of roots, while underwatering can result in reduced photosynthesis due to the closure of stomates to prevent water loss.
Consistent and moderate watering is generally advisable for many plant species, including sunflowers, to promote healthy growth. However, it's also important to be sensitive to specific environmental conditions that might modify the watering needs, such as soil type, climate, and plant size. To provide a precise answer to the student's question, one would need to evaluate Krista's observational data from her six-week study.
In Gary's experiment, we understand that he controlled variables such as container size and the amount of water provided daily, to focus on how different levels of sunlight affect plant growth. His hypothesis seemed to be driven by the observation that plants that receive more sunshine may grow larger than those that receive less sunshine.