(a) A hormone can be defined as a chemical substance produced in small quantities by endocrine/ductless glands and carried to all other parts of the body/target organs by blood stream/vascular system, where it produces/exerts a response.
(b) Role of adrenaline in an emergency: -

Any emergency experienced by an animal usually causes a sudden rage/fear/fright
This leads to the release of adrenalin into the blood; which stimulates the sympathetic nervous system and consequently many different organs
The rate of heart beat is increased and there is heavy breathing
Similarly, there is increase in the body blood sugar/conversion of liver glycogen into glucose.
The muscular tone/power is increased/ there is resistance to fatigue, the pupils of the eyes dilate and the visceral muscles are affected, the animal reacts quickly and energetically.

(c) Differences between hormonal co-ordination and nervous co-ordination

Hormonal co-ordination	Nervous co-ordination
Involves transmission of chemicals	Involves transmission of electrical impulses and chemical substances by the nervous system
Response to stimulus is slower	Response to stimulus is faster
Hormones are secreted into the blood and carried to any part of the body	Nerve impulses are transmitted to a particular location/target organ by a particular set of neurons
The target is usually far away from the site of production	Target organ maybe near or far
Response may last for a long time	Response are short lived
secretion of hormones and their actions are involuntary	nervous actions and their responses are voluntary and involuntarily
Hormonal co-ordination occurs in both plants and animals	Nervous co-ordination occurs only in animals

(d)(1) Animal Hormones: -

Somatotropic hormone
Prolactin
Gonatotropic
Thyroxine
Thyrotropic hormone
Oxytocine
Anti-diuretic hormone/A.D.H.
Parafhormone
Adrenalin
Insulin
Oestrogen
Progesterone
Testosterone And
rosterone

(ii) Plant Hormones: -

1 AA/indole-3- Acetic acid/Auxin
2-4D/2-4 Dichlorophenoxy
acetic acid
Gibberellins
Cydtokinins/kinins
Abscisie/Absisic acid
Benzoic acid
NAA/Naphthalene acetic acid
IBA/Indolebutryric acid
Ethelene
Vernalin.