Elephantiasis is caused by

Give the differences between bony and cartilaginous fish.

Organisms without a nucleus and cell organelles belong to:
$(i)$ Fungi
$(ii)$ Protista
$(iii)$ Cyanobacteria
$(iv)$ Archaebacteria

Pteridophyta do not have

Classify the following animals based on the number of chambers in their heart: Rohu,Scoliodon,Frog,Salamander,Flying lizard,King Cobra,Crocodile,Ostrich,Pigeon,Bat,Whale.

State appropriate terms for the following:
$(i)$ Amphibians of the plant kingdom.
$(ii)$ Plants not having well-differentiated body design.
$(iii)$ Single-celled,eukaryotic,and photosynthetic organism.