How nervous control differs from hormonal control?

What are phytohormones? Give examples of these hormones and at least one function.

What is meant by the following: (a) Feedback mechanism (b) Geotropism (c) Thigmotropism?

(a) Give only the significance of following: (i) Reflex arc

(ii) Reflex action

(iii) Stress hormone.

How are the following organs or structures protected in our body: (i) Spinal cord (ii) Brain?