Which $C_3$ plants are used in greenhouse crops?

Photosynthetic organisms occur at different depths in the ocean. Do they receive qualitatively and quantitatively the same light? How do they adapt to carry out photosynthesis under these conditions?

The correct sequence of the rate of photosynthesis in different light wavelengths is:

Identify the incorrect sentences:
$(I)$ Humidity in the atmosphere is relatively higher in areas where light becomes a limiting factor for plants.
$(II)$ An increase in light intensity beyond a certain point causes the breakdown of chlorophyll,leading to a decrease in the rate of photosynthesis.
$(III)$ $C_4$ plants respond to higher temperatures and show higher rates of photosynthesis,while $C_3$ plants have a much lower temperature optimum.

During photosynthesis,what percentage of incident solar radiation is utilized by higher plants?

What happens when light intensity is increased beyond a certain limit on a plant?