🌑Defination
🔴Arthropods have segmented bodies, jointed appendages and chitinous exoskeleton.
🔴This is the largest phylum of Animalia which includes insects. Over two-thirds of all named species on earth are arthropods
🌑General features
🔴They have organ-system level of organisation with bilaterally symmetrical, triploblastic, segmented and coelomate animals.
🔴The body of arthropods is covered by chitinous exoskeleton.
🔴The body consists of head, thorax and abdomen and in some head is joint with thorax called cephalothorax.
🔴They have jointed appendages.
🔴Circulatory system is of open type. Sensory organs like antennae and eyes which can be compound and simple.
🔴Statocysts or balancing organs are present in aquatic arthropods .
🔴They are mostly dioecious. Fertilisation is usually internal. They are mostly oviparous. Development may be direct or indirect.
🔴Economically important insects are :
🔴Some Arthropods are vector of diseases. Anopheles, Culex and Aedes are vectors of Malaria , Filaria and Dengue respectively.
🌑Examples of Arthropoda
🟡 Locusta
🔴Locusta is a Gregarious pest. It become more active and take unusual flight during high temperature.
🔴It is herbivores with large wing and body colour is yellow or brown.
🔴It has six jointed legs and Short antennae.
🔴It can change body color and shape when it move to gregarious phase.
🔴It follows various stages in its life cycle when it convert from larval to adult.
🔴It has well developed nervous system or brain when it attains the gregarious phase.
🟡Limulus
🔴It is also called as king crab and it is a Living fossil.
🔴It is marine and body is divided into cephalothorax and abdomen.
🔴Cephalothorax is broad and covered by the horse shoe carpacae.
🔴Abdomen has sex segments and bear six pairs of appendages.
🔴First segment of abdomen bear genital pore and other five pairs have book gills for respiration.
🔴Coxal glands is present for Excretion.
🔴Development is indirect with Trilobite larva.
🔴It is also called as Prawn. Body is divided into cephalothorax , abdomen and tail.
🔴Adult stage is dark red or orange red but it's young stage is green or brown.
🔴It has five pairs of walking leg in head and five pairs of swarming leg on abdomen .
🔴The body of Prawn is covered by chitinous exoskeleton.
🔴Carapace covers cephalothorax completely.
🔴Telson is a tail fin that bear anus.
🔴Uropods are last segment that help in movements.
1. Arthropoda is largest phylum because it covers what proportion of species in world.
A. Two - third
B. One - third
C. half
D. One and half
Answer : C
2. Which one of following features is not present in members of Arthropoda.
A. Triploblastic
B. Bilateral symmetrical
C. Organ system level of organisation
D. Metameric segmentation
Answer : D
3. Match the list
A. Apis 1. Honey bee
B.Laccifer 2. Silk worm
C.Bombyx 3. Lac insect D.Anopheles 4. Malaria
A B C D
A. 1 3 2 4
B. 1 2 4 3
C. 2 1 3 4
D. 3 1 4 2
Answer : A
4. Which one of following features is not present in members of Arthropoda.
A. The body of arthropods is covered by chitinous exoskeleton.
B. The body consists of head, thorax and abdomen.
C. Circulatory system is of closed type.
D. They have jointed appendages and segmented body.
Answer : C
5. Consider the following Respiratory organ of Arthropods and select the correct code:
1. Tracheal system
2. Paired ganglion
3. Book gill
4. Book lung
5. Gills
A. 1, 2, 3 and 4
B. 1, 2, 3 and 5
C. 1, 3, 4 and 5
D. 2, 3, 4 and 5
Answer : C
6. Consider the following respiratory organ of Arthropods and select the correct code:
1. Tracheal system
2. Paired ganglion
3. Book gill
4. Book lung
5. Gills
A. 1, 2, 3 and 4
B. 1, 2, 3 and 5
C. 1, 3, 4 and 5
D. 2, 3, 4 and 5
Answer : C
4. Which one of following features is present in members of Arthropoda.
A. Antennae are sense organ in Arthropoda.
B. The body consists of head, thorax and abdomen.
C. Circulatory system is of closed type.
D. They have jointed appendages and segmented body.
Answer : C
5.Which of following characteristics is present in Arthropods.
A. Simple eyes & Compound eye.
B. Excretion by flame cells.
C. Closed circulatory system.
D. Respiration through body general surface.
Answer : A
6. Statocysts in aquatic arthropods is meant for
A. Osmoregulation and Excretion.
B. Balancing and Equilibrium
C. Respiration and gaseous Exchange
D. To capture the prey
Answer : B .
7. Which of the following is Excretory organ in Arthropods.
A. Proboscis glands
B. Nephredia
C. Excretory pore
D. Malpighian tubule
Answer : D .
8. Which of the following Arthropod is Gregarious pest.
A. Limulus. B. Apis
C. Locusta. D. Aedes
Answer : C
9. Which of the following Arthropod is / are vector of Disease.
A. Anopheles.
B. Aedes
C. Culex.
D. All of the above
Answer : D
10. Which one of following statement is not correct for the members of Arthropoda.
A. They are Dioecious.
B. Eye are simple and compound.
C. Development may be direct or indirect.
D. Fertilisation in External.
Answer : D
11. Consider the following features of Arthropods and select the correct code:
1. Dioecious
2. Oviparous
3. Development is Direct
4. Development is indirect
A. 2, 3 and 4
B. 1, 3 and 4
C. 1, 2, 3 and 4
D. 2, 3, and 4
Answer : C
12. Which of the following Arthropod is living fossil.
A. Limulus or King Crab B. Sacculina or Hermit Crab
C. Paleomon or Prawn
D. Laccifer or lac insect
Answer : A
13. Identify the following Arthropods.
A. Locusta and Prawn
B. Prawn and Locusta
C. Scorpion and Cockroach
D. Cockroach and Scorpion
Answer : B
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