The intermediate host of Schistosoma is

• Snail

• mosquito

• housefly

• sheep

The vitamin which is essential for blood clotting is

• Vitamin- A

• Vitamin- B

• Vitamin- C

• Vitamin- K

The female genital pore of Pheretima posthuma located upon the segment

• 14^th

• 16^th

• 18^th

• 15^th

Polyp phase is absent in

• Hydra

• Aurelia

• Physalia

• Obelia

In frog heart, there are cardiac muscles which consists of fibres called

• Purkinje fibres

• myonemes

• telodendria

• columnae carnae

Malphigian tubules are

• excretory organs of insects

• excretory organs of frog

• respiratory organs of insects

• endocrine glands of insects

In Mollusca, eye is present over a stalk, called

• ostracum

• operculum

• ommatophores

• osphradium

Tuberllarians are free living

• nematodes

• cestodes

• flat worms

• trematodes

The characteristic larva of Phylum- 'Coelenterata' is

• planula

• cysticercus

• rhabdiform

• wriggler

20.

In blood, CO₂ is transported majorly as

• sodium carbonate

• carboxyhaemoglobin

• bicarbonate

• CO₂ as such