The number of species of organisms currently known to science is?
(A) 3500000
(B) 35000
(C) 2500000
(D) 25000000
The heart is enclosed in a membrane called________?
(A) pleura
(B) pericardium
(C) peritoneum
(D) epithelium
Communities are ________ collection of organisms?
(A) Static
(B) Dynamic
(C) May be static or dynamic
(D) None of these
In which animal respiratory surface are found in more than one organ?
(A) birds
(B) human
(C) fish
(D) frog
The arrangement of ________ speaks of the division of labour within cell?
(A) Molecule
(B) Subatomic particles
(C) Atoms
(D) Organelles
Operculum is present in_____________?
(A) bony fish
(B) sea fish
(C) cartilaginous fish
(D) none of these
In human body 99% of total mass is formed of_____________?
(A) 16 Bio-elements
(B) 12 Bio-elements
(C) 10 Bio-elements
(D) 6 Bio-elements