Only the retina's rod cells, and not its cone cells, require retinal. (True or false?)

Only the retina's rod cells, and not its cone cells, require retinal.
 
  Indicate whether the statement is true or false

Q. 2

Beta-carotene is a precursor of retinol.
 
  Indicate whether the statement is true or false

Q. 3

Guinea pigs and humans are two groups that cannot synthesize their own vitamin C and must
  consume it in their diet.
 
  Indicate whether the statement is true or false

Q. 4

A free radical is highly unstable because it has unpaired electrons in its outermost shell.
 
  Indicate whether the statement is true or false

Q. 5

Vitamin A deficiency is a severe public health concern in developing nations, often resulting in
  blindness and death due to infection.
 
  Indicate whether the statement is true or false

Q. 6

Toxicity symptoms of vitamin A include birth defects, spontaneous abortion, blurred vision, and
  liver damage.
 
  Indicate whether the statement is true or false

Q. 7

Excessive consumption of vitamin A supplements can be highly toxic.
 
  Indicate whether the statement is true or false

Q. 8

Selenium is the only mineral with a known antioxidant function.
 
  Indicate whether the statement is true or false