Pest of pearl-osyster is:
A.Star-fish
B.Crab
C.Fish
D.None of these
A.Star-fish
B.Crab
C.Fish
D.None of these
A.Helminthss
B.Moluscs
C.Arthropods
D.Echinoderms
A.Nocturnal animals
B.Diurnal animals
C.Both (a) & (b)
D.None of these
A.Star-fish
B.Hourse-fly
C.Pila
D.Cockroach
A.Astigmatism
B.Cataract
C.Strabismus
D.None of these
A.In front of retina and can be corrected by using convex lenses
B.In front of retina and can be corrected by using concave lenses
C.Behind retina and can be corrected by using convex lenses
D.Behind retina and can be corrected by using concavelenses
A.Protractor lentis muscles
B.Retractor lentis muscles
C.Ciliary muscles
D.None of these
A.Act as aggressive mechanism
B.Increase the stimulation of retinal cells
C.Perform both of these functions
D.Perform none of these functions
A.Ciliary muscles are relaxed and lens is flattened to have maximum focal length
B.Ciliary muscles are contracted and lens becomes maximum convex
C.Ciliary muscles are relaxed and the lens becomes maximum convex
D.Ciliary muscles are contracted and the lens becomes flattened
A.In front of retina and can be corrected by using concave lenses
B.In front of retina and can be corrected by using convex lenses
C.Behind the retina and can be corrected by using concave lenses
D.Behind retina and can be corrected by using convex lenses