Biology Questions and Answers
- How are the excretory
systems of the three main
arthropod classes constituted?
In crustaceansorgans called green glands e a pair of excretoryxists. The (^)
green glands collect residuals fblood and other parts of the body. Theyrom the (^)
are connected by ducts to excretory
pores located uantennae and these pores release thnder the base of the (^) e
excretions outside.
In insects small structures called
malpighian tubules gatthe blood and throw them into excretoryher wastes from (^)
ducts that open in the intestine. In
these animalstogether with f excretions areces. e eliminated
In arachnids, btubules, there are coxalesides malpig glands locatedhian (^)
in the cephalothorax near the limbs that
also participate in excretion.
- What are the noteworthy
features of the nervous
system of arthropods?
In arthropods the nervous system has
more sophisticatedwith well-advanced cephalization. sensory receptorsIn the (^)
anterior rfusion of ganglia forming a brainegion of the body there is a
connected to two ventral ganglial chains
having motor and sensory nerves.
The boosted development of the
sensory systemmore adaptive p of arthropods possibilities for theserovides
animals to explore many different
environments.
- What are compound eyes?
Arthropods have compound eyes made
of several visualEach ommatidium units called transmits visualommatidia.
information through the optic nerve to
the brain, wBecause they are round and numerous,hich interprets the image. (^)
these ommatidia,surfaces point in different directions whose external (^)
creating independent images, cause
arthropod eyes havlarger than the visual fie a large visual field,eld of
vertebrates. Some insects have one or
more simplcompound eyes.e eye besides their pair of
- How is arthropod
reproduction characterized?
Reproduction in Arthropoda is sexual, with beings of the phylumlarval stage (^)
in some insects(arachnids present only direct and crustaceans
development).
- What are the types of
fecundation that occur in
arthropods? What is the
predominant type?
In arthropods thexternal fecundation ere are species hand other speciesaving (^)
having internal fecundation is pfecundation. redominant.Internal
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