The nematode cuticle contains
glucose
skin cells
chitin
nerve cells

The nematode cuticle contains chitin.

Explanation:

In nematodes, the cuticle is the outermost layer of the tegument, immediately above the epidermis and secreted by it. It is a rigid, acellular formation (without cells), of complex structure and composed of chitin, among other substances. Its function is twofold; on the one hand it is a rigid protective and impermeable layer; secondly, it is the anchor point of the animal's muscles, so that it acts as an external skeleton (exoskeleton).

energy per photon is e = h*c / λ  

e = 6.63*10^-34 * 3*10^8 / 6*10^-7 j = 3.315*10^-19 j  

nr. of photons = 10j / 3.315*10 = ^-19 j per photon = 3.02*10^19 photons