1. | rag worm, an annelid |
2. | round worm, a nematode |
3. | flat worm, a platyhelminth |
4. | acorn worm, a hemichordate |
I: | important vectors for some human pathogens. |
II: | mosquitoes belonging to Arthropoda. |
III: | arthropods with closed circulatory system. |
IV: | arthropods lacking jointed appendages. |
Fasciola, Pila, Chaetopleura, Ancylostoma, Saccoglossus, Meandrina, Hirudinaria, Labeo, Ichthyophis |
Column I | Column II | |
1. | Ancylostoma, Taenia | Pseudocoelom, Bilateral symmetry |
2. | Delphinus, Camelus | Mammary glands, Hair |
3. | Octopus, Dentalium | Closed circulation, segmented body |
4. | Obelia, Hydra | Metagenesis, Diploblastic |
A: | Bilateral symmetry |
B: | Body covered with a plate like exoskeleton |
C: | Legs with joints and wings |
1. | Closed circulation |
2. | Lack of a true coelom |
3. | Ammonotelic excretion |
4. | Body divided into head, thorax and abdomen segments |
(a) | All living members of the class Cyclostomata are endoparasites in mammals. |
(b) | Cyclostomes have a sucking and circular mouth without jaws. |
(c) | Their body is devoid of scales and paired fins. |
(d) | Cranium and vertebral column are bony. |
1. | Hemichordates | Worm like with proboscis, collar and trunk |
2. | Mollusca | External skeleton of shell usually present |
3. | Porifera | Body with pores and canals in walls |
4. | Arthropoda | Exoskeleton of cellulose and jointed appendages |
1. | They are mostly terrestrial animals and their body is covered by dry and cornified skin, epidermal scales or scutes. |
2. | They do not have external ear openings and tympanum represents ear. |
3. | Heart is usually four-chambered, but three-chambered in crocodiles. |
4. | Fertilisation is internal and development is direct. |
I: | Males bear claspers on pelvic fins. |
II: | Viviparity is never seen. |