The nervous system is one of the most important nervous system of the body as it regulates the functioning of all the other system of the body. Human nervous system is divided into the peripheral nervous system and central system.
The peripheral nervous system includes all the nerves that are located outside the brain. Total 12 cranial nerves are included in the peripheral nervous system. These nerves are important for the body as they regulate the function like touch, see, smell and regulates the functioning of lungs and heart.
It will bend and grow towards the hole because the sunlight will shine through the hole and the plant will sense it so it will grow towards the light. I hope I could help you :)