The cell is a functional unit of living organisms because

A. multicellular organisms are made up of cells

B. all cells in a multicellular organism function as a single cell

C. the function of a multicellular organism is the sum total of the functions of its constituent cells

D. the function of a single cell is superior to that of the multicellular organism

E. the cells of a multicelullar organism are similar in structure

The organelle which eliminate water from the body of protozoa is

A. plasma membrane

B. contractile vacuole

C. cell wall

D. protoplasm

E. nucleus

Spirogyra is regarded as a multicellular plant because

A. its cells are linked together by cytoplasmic strands

B. its cells are joined to form organs

C. the cylindrical cells are linked end to end

D. the filaments consist of one cell only

E. it is an algea containing large vacuoles

The mechanism of gaseous exchange in living organisms is essentially by

A. osmosis

B. inhalation

C. diffusion

D. exhalation

E. breathing

Which of the following statement is correct about diffusion?

A. it involves movement of water molecules only

B. Molecules move from a region of higher concentration to a region of lower concentration

C. differentially permeable membrane must be present for diffusion to occur

D. It involves when a solute can no longer dissolve in a solvent of only solute molecules into the Bowman's capsule

E. It occurs when a solute can no longer dissolve in a solvent

The process of anearobic respiration of yeast in sugar solution is known as

A. oxidation

B. fermentation

C. tissue respiration

D. alcohol production

E. decomposition

The following are functions of the skeleton except

A. providing support for the body

B. protection of delicate internal organs

C. maintenance of the shape of the body

D. providing attachment for muscles

E. controlling growth rate in animals

Muscles are attached to bones by means of

A. ligament

B. cartilage

C. synovial membrane

D. tendons

E. connective tissue

Which of the following tissues is not found in the stem and root of monocotyledons?

A. Xylem

B. Cambium

C. Pith

D. Cortex

E. Pericycle

The pulmonary vein carries

A. oxygenated blood from right ventricles to the lungs

B. oxygenated blood from lungs to the left auricle

C. deoxygenated blood from the lungs

D. oxygenated blood from lungs to the right auricle

E. deoxygenated blood from the right ventricle to the lungs

The upper part of the trachea in mammals is called

A. palate

B. epiglottis

C. larynx

D. glottis

E. bronchus

Which of the following parts of the mammalian skin is directly is directly involved in excretion?

A. Sebaceous gland

B. Sweat gland

C. Hormy layer

D. Hair follicle

E. Malphigian layer