Final answer:
Surviving plants in a contaminated atmosphere allowing only green light to pass through would exhibit adaptations such as enhanced sensitivity to green light and architectural changes to optimize growth and light absorption. These plants would have deep green coloration, taller stems, and reduced foliage.
Step-by-step explanation:
If the atmosphere was contaminated and only green light was able to pass through the ground, surviving plants in a thousand years would likely exhibit several adaptations to optimize their growth and survival under such conditions.
Under the influence of green light, plants would absorb and utilize this specific wavelength for photosynthesis. They may undergo genetic modifications over time to enhance their sensitivity to green light and optimize their chlorophyll content. As a result, the surviving plants would exhibit a deep green coloration, as they would reflect most of the green light.
Furthermore, plants would likely undergo architectural changes to reach the available green light. They would grow taller and develop elongated stems to maximize their exposure to the limited light source. In contrast, they would have smaller leaves and reduced foliage, as they would not need to utilize other wavelengths of light efficiently.