Which of the following groups embraces the rest?

A. Class

B. Kingdom

C. Phylum

D. Species

The group mollusca is characterized by the presence of

A. jointed appendages

B. star-shaped bodies

C. backbones

D. Soft, non-segmented

A virus can sometimes be regarded as a living organism because it

A. causes disease in plants and animals

B. exists in a variety of shapes

C. reproduces in living cells

D. is easily visible with the aid of an electron microscope

A mayor difference between plants and animals is that

A. there is free movement in animals while this is limited in plants

B. there is indefinite growth in animals only

C. animals consume inorganic materials as food, while plants consume organic materials

D. animals give up carbon-dioxide as a waste product of respiration while plants do not.

Which of the following adaptation is no found in fruits and seeds dispersed by the win '?

A. Small and light body

B. Spongy coats

C. Turfs of hairs

D. Wings on pericarp

The main similarity between unicellular and multicellular organisms is that both

A. perform all life activities

B. exist as filaments

C. are plants

D. exist as colonies

One important characteristic of green plants is that they

A. possess specialized sense organs

B. are usually motile

C. are autotrophic

D. respond slowly to stimuli

A serious disadvantage of complexity in higher organisms is

A. a high demand for food and energy

B. ability to function in many specialized roles

C. little amount of energy dissipated in functioning

D. specialization of parts of the body

Which of these organs can be considered vestigial in humans but functional in other mammals? The

A. liver

B. appendix

C. rectum

D. stomach

Which of the following pairs of organisms are photosynthetic?

A. Amoeba and Paramecium

B. Volvox and Rhizopus

C. Chlamydomonas and Euglena

D. Nostoc and Plasmodium

Which of the following pairs of organisms exist as colonies?

A. Obelia and Euglena

B. Pandorina and Volvox

C. Chlamydomonas and Amoeba

D. Hydra and Spirogyra

Which of the following Best explains why It is difficult to see clearly in dim light?

A. Initially the eyes cannot operate when the light is dim

B. The choroid reflect all the light that enters the eye

C. Too little light reaches the retina and so the cones may not be stimulated at all

D. Dim light causes the pupil to close up so that not much light enters the eye

In active transport, molecules move against a concentration gradient, therefore

A. molecules move from a region of low concentration to a region of high concentration

B. molecules move from a region of high concentration to a region of low concentration

C. the concentration gradient has little effect on the movement of molecules

D. molecules force their way through special channels