Lec7

Question 1

Large uptake will occur when the stoma is closed
T/F?

Answer 1

F, Little or no uptake will occur

Question 2

Stomata resistance is determined by?

Answer 2

o stomatal size.
o stomatal number.
o stomatal anatomical characteristics.
o the size of the stomatal aperture.

Question 3

Stomatal opening is regulated by?

Answer 3

o internal CO2
content.
o light.
o humidity.
o temperature.
o water availability.
o nutrient status, particularly potassium

Question 4

is the first target of atmospheric pollution.

Answer 4

epidermis

Question 5

important factors affecting uptake?

Answer 5

❖ nature of these membranes.
❖ chemical and physical properties of the toxicant

Question 6

storage depots include?

Answer 6

liver. lungs. kidneys. bone. adipose tissue, and others

Question 7

plays a central role in metabolizing xenobiotics
Which organ ?

Answer 7

liver

Question 8

rich supply of nonspecific enzymes in the stomach enables it to metabolize a broad spectrum of organic materials.
T/F?

Answer 8

F, in the .liver

Question 9

Excretion may take place through ?

Answer 9

lungs, kidneys, intestinal tract

Question 10

A pollutant may be excreted in its (original form) or (as its metabolite) not depending on its chemical properties.
T/F?

Answer 10

F, depending

Question 11

involve the introduction of a (reactive polar group) into the xenobiotic, forming a primary metabolite.
Which phase of metabolism?

Answer 11

Phase I reactions

Question 12

involve conjugation reactions in which an (endogenous substance), forming a complex secondary metabolite
Which phase of metabolism?

Answer 12

Phase II reactions