Plant anatomy or phytotomy is the general term for the study of the internal structure of plants. ... Plant anatomy is now frequently investigated at the cellular level, and often involves the sectioning of tissues and microscopy.
The further away means it gets a weaker source if light and less reaches it.
Explanation:
Since the plant produces oxygen in photosynthesis, you can use this to measure the rate of photosynthesis. Which is affected by light and it's availability.
