King fisher have ----------------- in eyes which protect them when they hit the water.
nictitating
mucus
peripheral
epithelial
______________ is a molluscan group which possess eyes resembling vertebrate eyes.
Bivalvia
Gastropoda
pelecypoda
cephalopoda
Male and female cockroaches can be distinguished externally by the presence of ______________.
anal styles in male
anal cerci in female
anal style and antennae in females
both (b) and (c)
In which animal, dimorphic nucleus is found?
Amoeba
Trypanosoma gambiense
plamodium vivax
paramecium caudatum
During its life cycle, Fasciola hepatica (liver fluke) infects its intermediate host and primary host at the following larval stages respectively _______________.
metacercaria and cercaria
miracidium and metacercaria
redia and miracidium
cercaria and redia
Which one of the following in birds indicates their reptilian ancestory?
scales on their hindlimbs
four chambered heart
Two special cahmbers crop and gizzard in their digestive tract
Eggs with a calcareous shell
The flightless bird cassowary is found in ___________.
Mauritius
Australia
New Zealand
Indonesia
Metamorphosis of insects is regulated through ______________ hormone.
Pheromone
thyroxine
ecdysone
All of these
The organisms attached to the substratum generally, possess ________________.
radial symmetry
one single opening of digestive canal
asymmetrical body
cilia on surface to create water current.