In complex food relationships in a community, the primary, secondary and tertiary consumers are referred
to as

A. symbionts

B. omnivores

C. heterotrophs

D. autotrophs

E. carnivores

The cell membrane of a cell is said to be semi-permeable because

A. it allows only large molecular substances to pass through it into the cell

B. it is actively involved in energy production in the cell

C. it actively allows all substances to pass through it by diffusion

D. it is actively selective in allowing substances pass through it

E. fatty acids are only the building blocks of the membrane

The function of the part labelled I is

A. controlling water loss

B. trapping solar energy

C. absorbing water

D. storing sugar

E. transporting sugar

The part labelled ll is the

A. stoma

B. palisade cell

C. spongy cell

D. guard cell

E. epidermal cell.

The structure that will be stained blue-black by iodine is labelled

A. I

B. II

C. III

D. IV

E. V

In the anaerobic stage of respiration, the net ATP molecules produced per
glucose molecule

A. one

B. two

C. three

D. four

E. five

Reabsorption of the metabolic products along the kidney tubules is made possible by the

A. closeness of the intestine to the kidney

B. convoluted nature of the tubules

C. presence of convoluted tubules in the medulla

D. presence of network of capillaries around the convoluted tubules

E. joining of the main collecting tubules to the kidney tubules

Hormones are transported around the mammalian body by

A. water

B. nerves

C. blood

D. osmosis

E. diffusion

Which of the following is not a function of insulin?

A. Accelerates the rate at which glucose is converted to glycogen

B. Promotes the uptake of glucose by tissues

C. Regulates the amount of glucose in the blood

D. Accelerates the absorption of glucose at the glomerulus

E. Stimulates muscles to oxidize glucose.

Which of the following is the correct route of transmission of impulses along a reflex arc?

A. Receptor → sensory neurone → synapse → intermediate neurone → synapse → motor neurone → effector

B. Receptor → motor neutron e synapse → intermediate neurone → synapse → sensory neurone effector

C. Receptor → synapse → sensory neurone → intermediate neurone → synapse → effector → motor neurone

D. Effector → motor neurone → synapse → sensory neurone → synapse → intermediate neurone → receptor

E. Effector → intermediate neurone → synapse → motor neurone → synapse → sensory neurone → receptor.