Multiple choice

1. In the human body, the _______ is a muscular membrane that separates the thoracic cavity from the abdominal cavity.

A. epiglottis 

B. esophagus 

C. diaphragm

D. bolus

2. In kidneys, the tiny tubules that produce urine are called

A. nephrons. 

B. the ureters. 

C. the renal cortex.

D. the renal medulla.

3. Which of these plant hormones hastens the ripening of fruit and helps to cause the fall of leaves, flowers, and fruit?

A. Cytokinins 

B. Auxins 

C. Ethylene

D. Gibberellins

4. In the central nervous system, the _______ communicates with and coordinates what happens in other parts of the brain.

A. cerebrum 

B. cerebellum 

C. brain stem

D. hypothalamus