Animal Classification - Phylum Arthropoda

Question 1

Two classes of Arthropoda

Answer 1

Class insecta (insects) 
Class Arachnida (spiders)

Question 2

Characteristics of class Arachnida

Answer 2

Eight legs in four pairs
Two main body segments, cephalothorax and abdomen
Do not have wings
Parasites, ectoparasites of plants and animals

Question 3

Examples of Arachnida

Answer 3

Spiders, ticks, mites

Question 4

Explain ectoparasite

Answer 4

An external parasitic organism that lives on the skin or exterior of the body

Question 5

Red spider mite

Answer 5

Are a plant parasite

Sucks the sap of fruit and veg including cucumbers and strawberries

Question 6

How to control red spider mite

Answer 6

Use of pesticide

By the introduction of a predator mite

Question 7

Ticks

Answer 7

Live on the skin of sheep and cattle
Sucking blood
Most important tick in Ireland, sheep tick (a carrier of babesia which causes red water fever)

Question 8

Characteristics of phylum Arthropoda

Answer 8

Invertebrates, do not have a back bone
Segmented body
Jointed limbs
Have an exoskeleton, made of chitin, protects body
Shed exoskeleton as they mature to allow growth and development and produce another exoskeleton

Question 9

Classifications of class insecta

Answer 9

Segmented bodies, 3 parts, head, thorax and abdomen 
Six legs in tree pairs
2 antennae 
Compound eyes 
Normally have two pairs of wings

Question 10

Two types of metamorphosis

Answer 10

Incomplete and complete

Question 11

Explain incomplete metamorphosis

Answer 11

The immature insects undergoes a series of moults, shedding its exoskeleton to allow growth and development at each stage.
Immature insects undergoing this process of development are know as nymphs. Similar physically to the adult but smaller.
Examples aphids, dragonflies

Question 12

Life cycle of an insect that undergoes incomplete metamorphosis

Answer 12

Egg - Nymph - Adult

Question 13

Aphids or greenfly

Answer 13

Cause damage to plants
Suck sap from the plant, stunt growth and curled yellow leaves
Also transmit viruses
Can effect potato, cereals and sugar beet from virus

Question 14

How to control aphids

Answer 14

The use of aphidicides and ladybirds (predator)

Cold, wet, windy conditions are not suitable for aphids

Question 15

Explain complete metamorphosis

Answer 15

• Each stage of cycle is physically different to the previous stages
• The laval stage is worm like, feeding stage of cycle
• Laval develops into a pupa, often protected by a cocoon, resting stage
• Undergoes must change at this stage, emerges as an adult
• Example butterfly

Question 16

The life cycle of an insect that undergoes complete metamorphosis

Answer 16

Egg - Larva - Pupa - Adult

Question 17

Insect pests that undergo a complete metamorphosis

Answer 17

Crane fly (insect) leather jacket (larval) eat roots of grasses, cereals, veg and strawberries 
Click beetle (insect) wireworm (larval) feed on roots of grass, damage potato tubers sown after grass