Classification of Animals Test - 6

The sense organ of Ascaris is simple elevations supplied by the nerve. They include various papillae, aphids and phasmids. The dorsal lip bears two-minute double papillae whereas single papillae are called as amphid. The amphids are probably chemoreceptors, while the other sensory papillae are perhaps tango receptors. Phasmids are chemoreceptors that open one on either side of the tail of female. 

So, the correct answer is 'All of the above'

Arthropod bodies are supported by external bones or hardened exoskeleton which is made up of chitin.

It is produced by their skin which hardens to form a protective outer covering.

The exoskeleton is a non-living substance that provides protection and prevents water loss from their body.

So, the correct answer is 'Chitin'.

Ascaris lumbricoides is commonly called Roundworm.
Ancylostoma is commonly called Hookworm.
Enterobius is commonly called seat or pinworm.
Wuchereria is commonly called Filarial worm.

So, the correct answer is 'Roundworm'

Hookworm is the parasitic nematode. Tapeworm and Fasciola are the flatworms (Platyhelminthes). They have dorsiventrally flattened body with bilateral symmetry organ level organization. Thus, the correct answer is option D. 

The annelids resemble the Arthropoda in the arrangement of the nervous system, which constitutes a ganglionated double chain, traversed at one point by the eoesophagus.

So, the correct option is A

The blood of the annelids usually contains hemoglobin, a red oxygen carrying pigment. In some annelids, erythrocruorin is present. It is a large oxygen-carrying protein.
Therefore, the correct answer is option C.

Ascaris does not show metamerism.  It is a monogenetic parasite which completes its lifecycle in a single host. Ascaris shows separate male and female worms with sexual dimorphism and a rhabditiform larva stage in its life cycle. Thus, the correct answer is option A.

The earthworm belongs to class Annelida. It has closed circulatory system. The blood runs in closed vessels known as arteries and veins and returns back to the heart. In this type of system, blood is pumped by a heart through vessels and does not normally fill body cavities.

Therefore, the correct answer is option B.

Annelids are segmented worms. Earthworms belong to this phylum because their bodies are sectioned; creating the ridged or ringed appearance that gives the "ringed worms" of this phylum their name.

So, the correct answer is 'Annelida'.

Phylum Arthropoda of the kingdom Animalia is characterised by the jointed legs and exoskeleton, It consists of:

Apis (honey bee), Bombyx (Silkworm), Laccifer (lac insect), Anopheles, Culex and Aedes (mosquiotes), Locusta (locust), Limulus (king crab). Thus, the correct answer is option A.

Butterflies belong to the phylum 'Arthropoda', to which insects belong. Butterflies and moth belong to the order Lepidoptera. Lepidos is Greek for "scales" and ptera means "wing". These scaled wings are different from the wings of any other insects. So, the correct option is 'Arthropoda'.

Round worms are unisexual animals and they belong to phylum Nematoda or Aschelminthes. It is bilaterally symmetrical, triploblastic pseudocoelomate.

So, the correct option is A

Characteristics of phylum Annelida are as follows:

Cylindrical, segmented, bilaterally symmetrical and triploblastic organisms.

Coelomate, often divided by internal septa, the body possesses a through the gut with mouth and anus. 

Closed circulatory system. 

Reproduction is sexual but sexes are not separate (hermaphrodite).

Locomotion is through setae.

For example, earthworm, leech, nereis, etc.

Therefore, the correct answer is option D.

When the bodies of organisms are made up of segments and the segments are similar to each other, then this type is known as metameric segmentation. Annelid exhibit metameric segmentation.
Annelids are all bilaterally symmetrical animals. They are triploblastic meaning have three embryonic tissue layers as ectoderm, mesoderm and endoderm. Nearly all annelids have a fluid-filled cavity between the outer body wall and the gut and this is referred to as coelom and thus is coelomates.
Therefore, the correct answer is option D.

The phylum Annelida is characterised by the presence of a segmented, tube-shaped body. Earthworm belongs to the phylum Annelida. 

So, the correct option is 'Annelida'.