Which of the following organs are used for gaseous exchange in a mature toad?

A. Gills, lungs and eardrum

B. Lungs, mouth and eardrum

C. Mouth, skin and gils

D. Skin, lungs and mouth

Which of the following statements about the diaphragm of a mammal is not correct? it

A. separates the thorax and the abdomen

B. is a thick layer of muscle

C. is made of epithelial cells

D. is part of the human respiratory apparatus

Which of the following structures is used for respiration in insects?

A. Lungs

B. Thorax

C. Cuticle

D. Spiracles

A substance present in the glomerular filtrate in the mammalian Kidney is

A. glucose

B. fibrinogen

C. albumen

D. blood platelets

In humans, excretion of hypertonic urine is associated with the

A. distal convoluted tubule

B. loop of Henle

C. bowman's capsule

D. proximal convoluted tubule

The maintenance of a stable internal environment within the body of a mammal is known as

A. osmosis

B. plasmolysis

C. homeostasis

D. excretion

Which part of the nephron is associated with ultra-filtration?

A. Distal convoluted tubule

B. Proximal convoluted tubule

C. Collecting duct

D. Bowman's capsule

Which of the following conditions would result result in a decrease in the production of antidiuretic hormone?

A. Abnormally high blood sugar level

B. Drinking large quantities of water

C. Increase in osmotic pressure of blood

D. Period of strenuous exercise

Which of the following structures is not essential in a wind pollinated flower?

A. Anther

B. Ovary

C. Stigma

D. Petal

The resolution of a microscope refers to its power to

A. increase an object's apparent size

B. distinguish clearly between two objects

C. scan the surface of an object

D. focus on an object