This is an
inference question that asks us to find the statement that we
can definitely infer (true) and the statement that we
cannot definitely infer (false).
Statement 1 : Non-mammals are unable to synthesize vitamin D from exposure to sunlight.
Neither True nor False.
Explanation : The passage talks about mammals and how they can synthesize vitamins in adequate amounts while exposed to sunlight. Nowhere, does the passage mention that non mammals can't do so. Maybe some can. In fact the passage doesn't talk about non mammals.
Statement 2: People with inadequate exposure to sunlight are at a high risk of developing diseases related to Vitamin D deficiency such as rickets and osteomalacia.FALSE.Explanation: The last statement "In the developed world, vitamins such as vitamin D are added to, or fortified, in certain foods such as milk and orange juice" refutes the claim in statement 2 by saying that in the developed world, Vitamin D can be obtained through diets and hence inadequate exposure to sunlight
doesn't imply high risk of developing diseases related to Vitamin D.
This makes statement 2 false.
Statement 3: Vitamin D obtained from sunlight is of a higher quality than vitamin D obtained from fortified foods.
Neither True nor False.
Explanation : The passage doesn't imply anything about the quality of vitamins obtained from different sources or compares the quality of vitamins.
Statement 4: Vitamin D obtained from fortified foods is of a higher quality than vitamin D obtained from sunlight.
Neither True nor False.
Explanation : The passage doesn't imply anything about the quality of vitamins obtained from different sources or compares the quality of vitamins.
Statement 5 : Vitamin D as a compound does not entirely fit the typical definition of a vitamin.TRUE.Explanation: This can be inferred from the passage. The trigger words "although" and "typically" points us towards this inference.
The passage says that "Typically, an organic chemical compound (or related set of compounds) is called a vitamin when it cannot be synthesized in sufficient quantities by an organism, and must be obtained from the diet" but the preceding line says that "Although vitamin D is commonly referred to as a vitamin, an organic compound required as a vital nutrient in tiny amounts by an organism, it can be synthesized in adequate amounts by all mammals while exposed to sunlight." Also, the last statement says that "In the developed world, vitamins such as vitamin D are added to, or fortified, in certain foods such as milk and orange juice."
The above statements imply that Vitamin D is rather an overlap of both characteristics :
Doesn't portray a fitting definition of a vitamin as it can be synthesized (based on first two statements)
and
also fits the definition of a vitamin as it can be obtained from diet (based on last statement).
This makes Statement 5 true.