Medical Quiz
Transportation and Excretion Quiz

___ opens and closes the stomata.

A. Guard cells

B. Xylem

C. Roots

D. Phloem

Select your answer:
A  B  C  D  E 

Topics:

Reproduction in Human Beings Health-Wellness-Illness Deficiency Diseases The Musculoskeletal System Smoking Related Diseases Endocrine System and Nervous System Vaccines Deficiency Disease Heart Vocab and Blood Flow Pathway Histology Urinary Cells and Organ Systems The Microbial World Gaseous Exchange in Humans Anatomy and Physiology

Other quiz: Teeth & Microbes

milk teeth start to fall out at the age of

A. 3

B. 5

C. 7

D. 6