ARACHNIDS (SPIDERS)

Question 1

explain Body Structure

Answer 1

bodies of Arachnids divided into cephalothorax and abdomen. 8 legs ,pair of pedipalps or palpi used to manage prey, a hard leathery exoskeleton , no antennae o

Question 2

explain Movement

Answer 2

spiders use Hydraulics to move and they move quick which make it easier for them to stalk and eat their prey

Question 3

explain Nutrition

Answer 3

spiders carnivores only catch living prey. Habitat dictates what insects spiders eat , big spiders eat millipedes small lizards frogs even small birds

Question 4

explain Respiration

Answer 4

spiders do not have blood . liquid called haemolymph is responsible transport of gasses

oxygen enters oxygen in 2 diff ways :

TRACHEA :
network of delicate tubes transport oxygen to body tissue . oxygen enters trachea through 1 / 2 breathing holes

BOOK LUNGS :
2 organs consists of 15 folds of tissue stacked and look like pages of book

Question 5

explain maintaining water balance

Answer 5

it is important that the intake and excretion of fluid is balanced. Most spiders get water from dewdrops and blood from prey. the curled-up legs of s spider with insufficient fluid. if spider id dehydrated, hydraulic action for movement stops

Question 6

explain reproduction

Answer 6

after mating female eats male to satisfy nutrient need. thousand eggs hatched. species sometimes weave silk egg casess. no metamorphosis

Question 7

explain senses

Answer 7

spiders have SIGHT, TASTE, TOUCH, SMELL

• their sense of touch is by far the most sensitive and is used to id touch, vibrations and movement in air body covered in hair connected to nervous system, end of spider legs as well as spinnerets are sensetive to temp
• well develope sense of smell used find mate during mating season
• most spiders great eyesight only see close up. sight mainly used to determine direction. 8 eyes

Question 8

explain Arachnids and ecosystem

Answer 8

well adapted specific environment or habitat. Spiders, scorpions ticks survive long without water. most hunters. ticks however are parasites. It very important that balance exists in ecosystem between Arachnids and other living organisms. Spider and scorpion were killed, the number of insect and small animals would increase and plant life would be destroyed