| A | B |
|---|
| Chemical Control | Similar to nerve control, chemical control coordinates body processes by transmitting messages from one part of the organism to another and Unlike nerve control, chemical control is achieved through hormonal action in both plants and animals |
| Plant Hormone | Effect growth and development,function in the growth, tropism and reorduction |
| Auxin | One type of plant hormone, influence division, elongation and differiation of plant cells, unequal distribuiont equals unequal growth called tropism, |
| Tropism | usually adaptive growth responses that enhance the survival of |
| Two Types | Phototropism and Geotropism |
| Phototropism | Growth of a plant towards light due to unequal distribution of auxins |
| Geotropism | Growth of a plant due to gravity |
| Chemical Control of an Animal | Chemical control in animals differs from that in plants since animals possess cells specialized solely for hormone production |
| Endocrine Glands | Endocrine glands synthesize and secrete hormones which control the activities of animals, Hormones are chemicals secreted in one area of the body which affect responses in other areas and, The circulatory system aids in the distribution of these hormones |
| Role of Animal Hormones | Hormones interact and exert control on metabolic activities such as metamorphosis and reproduction |
| Metamorphosis | • The development in an animal larva that transforms into a sexually mature adult |
