Phylum Arthropoda

Question 1

Beneficial Effects Of Arthropods

In terms of Pollination
In terms of feeding
In terms of material production
In terms of decomposition
In terms of research

Answer 1

Pollination of flowers
They serve as food
Some produce useful materials like silk E.g Bees
They serve as scavengers and thus, help in decomposition
Some are important for research E.g Housefly & Fruit fly(Drosophila Melanogaster)

Question 2

Economic Importance Of Arthropods

In terms of pest control
In terms of aesthetics
In terms of economic purposes
In terms of soil formation

Answer 2

They serve as biological control against pests
Some are used for aesthetic purposes
Some produce honey which is of great economic purposes
The faeces of arthropods are the basis for the formation of soil aggregates and humus

Question 3

Detrimental Effects

In terms of parasitism
In terms of diseases
In terms of destruction
In terms of nuisance

Answer 3

Some are parasitic, harming host
Some are vector of diseases
Some destroy wooden structures, crops and stored food
Some arthropods often constitute nuisance and cause painful bites to man

Question 4

Classification Of Arthropods

Sub phylum
Sub-phylum
Classes
Subphylum
Classes

Answer 4

Sub phylum: Onychophora
Sub-phylum: Chelicerata
Classes: Mereostomata, Pycnogonida, Arachnida
Subphylum: Mandibulata
Classes: Crustacea, Myriapoda (Diplopoda, Chilopoda), Insecta, Parapoda

Question 5

Characteristics Of Arthropods

In terms of group success
In terms of appendages
In terms of germ layers & symmetry
In terms of coelom
In terms of segmentation
In terms of type of exoskeleton

Answer 5

They are the most successful group of animals
There is a presence of jointed appendages (modified for walking, feeding, defense, copulation and sensory reception)
They are triploblastic and bilaterally symmetrical
They are coelomates
There is the presence of segmentation; however, the segmentation is more advanced than that found in annelids.
They possess chitinous exoskeleton(cuticle) and haemocoel

Question 6

Characteristics Of Arthropods

In terms of exoskeleton permeability
In terms of growth
In terms of circulatory system
In terms of sexes
In terms of development

Examples

Answer 6

Their exoskeleton is relatively impermeable to water
They grow by moulting/ecydysis for a new exoskeleton to be secreted
They possess an open circulatory system containing hemolymph
Their sexes are separate
Their development is either through complete or incomplete metamorphosis

E.g: Crabs, Crayfish, Spiders, Ticks, Millipedes and Insects, etc.

Question 7

Phylum Arthropoda

The … phylum of animals with approximately ….. described species

They are the most successful phylum based on …., …. and …..

Answer 7

The largest phylum of animals with approximately 1 million described species

They are the most successful phylum based on species, distribution and numbers of individuals