1. 28-4 Insects & Their Relatives
I. Insects and Their Relatives
A. Characteristics:
1. One pair of antennae
2. Appendages that do
not branch
VIDEO
B. Habitat: terrestrial, fresh and salt water

2. II. Centipedes and Millipedes
A. Centipedes
1. Description: Long, wormlike body;
1 leg/segment
2. Lifestyle = predator or carnivore
B. Millipedes
1. Description: Long, wormlike body;
2 legs/segment
2. Lifestyle = decomposer or
herbivore

3. III. Insects
A. Characteristics: 1. Body divided into 3 parts (head, thorax, abdomen) B. Feeding 1. Why are the mouthparts so different in different insects? They feed on a large variety of foods 2. Saliva contains specialized enzymes: a) Helps break down food b) Prevents blood from clotting (mosquitos) c) Change nectar into honey (bees)

4. C. Movement 1. Walk/jump 2. Fly D. Insect societies 1
C. Movement 1. Walk/jump 2. Fly D. Insect societies 1. Society: Separate individuals that depend on one another for survival Video & Ted-Ed Video 2. Within societies, there is division of labor Video

5. 3. The 3 basic castes & their main function(s) are: a) Reproductive females (queens) – lay eggs b) Reproductive males – fertilize the eggs c) Workers – perform all non- reproductive tasks (care for eggs, gather food, build, maintain, and defend the colony’s home)

6. E. Insect communication 1. Use: a) Sound eg
E. Insect communication 1. Use: a) Sound eg. cockroaches b) Visual signals eg. firefly c) Chemical signals eg. stinkbug

7. 2. Functions of communication are: a) Finding a mate b) Convey information to members of the colony 3. Pheromone: specific chemical messenger that affects the behavior and/or development of other individuals of the same species

8. 28-5 How Arthropods Fit into the World
I. How Arthropods Fit into the World A. Ecological role: 1. Sources of food Video 2. Pollinate plants Ted-Ed Vid B. Contributions to human life: 1. Produce products (ex. Honey, silk) 2. Medical and scientific research

9. C. List 3 things that arthropods damage: 1. Crops 2. Livestock 3
C. List 3 things that arthropods damage: 1. Crops 2. Livestock 3. Property (structures, clothes, etc)