Spider Anatomy

How many main segements do arachnids have?

• One

• Two

• Three

• Four

What is the primary function of a spider's chelicerae?

• Sensing vibrations

• Injecting venom and grasping prey

• Producing silk

• Breathing

What is the main sensory ability that most spiders rely on due to their poor vision?

• Smell

• Taste

• Sensitivity to vibrations

• Hearing through ears

Spiders carry out respiration using:

• Skin
• Book lungs

• Lungs
• Gills

What type of circulation do spiders have?

• Closed circulatory system
• Lymphatic system
• Open circulatory system

Spider thread are stronger than ​ (a)   and more stretchy than​ (b)  

• steel
• nylon

Spiders can only eat liquid food. They are adapted to this requirement by having specialize mouthparts called (a)   with which they can inject venom. Spider venom ​ (b)  

• chelicerae
• mandible 
• maxillae
• liquifies its prey
• paralyzes its prey so that it can drink its blood

What important function do spiders perform for the ecosystem?

• they pollinate plants

• they primary producers in the food chain.

• they provide habitat for other animals.

• control insect populations