In all arthropods,the body is covered with a chittinous cuticle which is secreted by the____________?

A. Endodermis
B. Mesophyll
C. Chitin
D. Epidermis

Sub- phylum vertebrate is also known as__________?

A. Pisces
B. Craniata
C. Aves
D. Amphibia

The phylum chrordata comprise about how many species?

A. 25,000
B. 50,000
C. 100,000
D. 10,00,000

It is stiff rod of special cells surrounded by connecive tissue present in the mid -dorsal region and appears in the embryos of all chordates

A. Placenta
B. Notochord
C. Cranianta
D. Ligule

They are considered to be the most primitive and are surely the first of the vertebrates?

A. Frogs
B. Reptiles
C. Amphibinas
D. Jawless fishes

The nephridia of earthworm open into the coelom by_________?

A. Nephrostome
B. Nephridiopore
C. Flame cell
D. Anus

Nephrostome in earthworm opens in____________?

A. External space
B. Internal body cavity
C. In gut
D. In bladder

Scolidon or dog fish belong to the group of fishes called__________?

A. Cartilaginous fishes
B. Bony fishes
C. Running fishes
D. Jawless fishes

Mammalian kidney, under restricted water supply can conserve water by over ________ % reabsorption of glomerular filtrate

A. 80.50%
B. 90.50%
C. 95.50%
D. 99.50%

Which of the following openings have cilia?

A. Nephrostome
B. Nephridiopore
C. Both of these
D. None of these