The organism that has a hydrostatic skeleton is

A. Tilapia

B. Hydra

C. mosquito larva

D. earthworm

The possession of scales, laying of eggs with shells and bony structure of the head are characteristics shared by

A. birds and reptiles

B. fishes and birds

C. reptiles and fishes

D. birds and molluscs

The group of Arthropods that has no antennae is the

A. Crustacea

B. Chilpoda

C. Arachnida

D. Diplopoda

The structure that is most commonly identified in all living cells under the light microscope is the

A. mitochondrion

B. chloroplast

C. nucleus

D. ribosome

Which of the following is an organ?

A. Guard cell

B. Liver

C. Xylem bundle

D. Blood

The structure labelled II is used for

A. tasting

B. feeling

C. biting

D. sucking

The structure labeled III represents the

A. mandible

B. palp

C. proboscis

D. labium

The division of a body into two equal halves along a longitudinal plane is called

A. bilateral symmetary

B. transverse section

C. radial symmetry

D. longitudinal section

In which of the following organisms does each cell combine the function of nutrition, reproduction and growth?

A. Rhizophus

B. Dryopteris

C. Brachymenium

D. Spirogyra

They key event in the transition of the amphibians from water to land is the

A. replacement of the gills with lungs

B. possession of webbed limbs

C. development of long hing limbs

D. possession of tympanic membrane