Define hormone.
State the tissue in the eye that changes light energy into nerve impulses.
State the part of the eye that contains the greatest number of light-sensitive cells and produces the most detailed image.
State the type of neurone that carries impulses from the eye to the brain.
State the nerve that contains these neurones and carries impulses from the eye to the brain.
Identify the organ labelled P.
Identify the gland labelled Q.
Complete Table 4.1 to show the effects of the hormone released when a person is in a dangerous situation.
Explain the advantages of coordinating a dangerous-situation response through both the nervous system and the endocrine system.
State the name of one hormone produced by plants.
Describe how the synthetic plant hormone 2,4-D is used in agriculture.