Animals/organisms floating on the surface of water are 
Organisms passively floating on the surface of water are planktons. If floating organisms are animals then it is zooplankton and if plant – phytoplankton.
Organ Pipe Coral is 
Tubipora is organ pipe coral comes under class Anthozia.
Silk thread is obtained from Silk Moth during 
Caterpillar larva is a voracious eater, it gets matured and by secreting silk thread changes into pupa & it encloses into silk cocoon
A wood boring mollusc/Shipworm is 
Teredo (shipworm) is the member of class – Bivalvia (double shell plates).
Shipworms are not in fact worms at all, but rather a group of marine mollusc (Eulamellibranchiata) in the family Teredinidae. They bore into submerged wood, and bacteria in a special organ called the gland of Deshayes enable them to digest cellulose. The shipworms belong to several genera of which Teredo is the most commonly mentioned. The best known species is Teredo navalis.
Association between Sucker Fish (Remora) and Shark is 
Commensalism is an association between two organisms in which one is benefitted but the other is not harmed.
Which is not a true amphibian animal
Tortoise (Testudo) is a member of orderChelonia, Class – Reptiles
Fire bellied toad is 
Fire bellied toad (Bombina Orientalis) is a member of family discoglossidae of order Anura of class Amphibia. Its belly is red or orange-red
Necturus is 
Necturus (Mud puppy) order – Urodela class – Amphibia. It is a species of salamanders that is a part of the genus Necturus.
Typhlops is 
Typhols is a non poisonous blind snake.
Both male and female pigeons secrete milk through 
Crop in birds stores & softens food and in pigeons secrete milk.
Feet of king fisher are modified for 
In birds hind limbs are variously modified for various functions like perching, grasping etc. In the kingfisher they are modified for wading.
Bird vertebrae are 
Bird vertebrae are heterocoelous. Acoelous vertebrae are found in mammals.
Hair occur in all mammals except those of 
Members of the order Cetacea of class Mammalia are aquatic animals like whales, dolphins having smooth and hairless skin.
Lamina propria is connected with 
It is the middle layer of 3 layered Mucosa (outer muscularis mucosa, middle lamina propria & inner simple columnar epithelium) of intestine. It is made up of a highly vascular connective tissue containing lymphatic nodules.
Fish which can be used in biological control of mosquitoes/Larvicidal fish is
Jelly Fishes belongs to class 
Animals which are marine, solitary, bell or umbrella shaped belong to class Scyphozoa i.e., Jelly fish.
Transfer of Taenia to secondary host occurs as 
The eggs of Taenia passes out through human faeces which is eaten by pigs, eggs develops into onchosphere then to cyst larva in the muscle of pig; The entry stage into secondary host (Pig) is onchosphere
Photoreceptors of earthworm occur on 
Light receptors found in diffused condition to differentiate between light and dark. These receptors are present on the dorsal surface.
Earthworms are 
Earthworms are very useful to human as they make the soil porous and increase its fertility through worm casting. They are called as Nature’s ‘plough man’.
A chordate character is 
Chordates are featured by the presence of the following characters.
Flight muscles of birds are attached to 
In birds flight muscles or breast muscles are attached to the large sternum or breast bone. The wings are powered by these flight muscles.
Wish bone of birds is from 
Two clavicles fused with inter clavicle to form a fork shaped bone called wish bone or furcula or bone of merry thoughts.
Eutherians are characterised by 
Etherians are placental animals. The foetus develop inside uterus of female where they are nourished by special structure called as placenta
Onchosphere occurs in 
Onchosphere is the larval stage in Taenia solium.
Taenia saginata differs from Taenia solium in 
Taenia saginata lacks rostellum and scolex hooks