LSAT 138 | Section 1 | Reading Comprehension: Q12

RC Question 12 Explanation

DISCUSSION: Primary substances are the main parts of a plant. They allow plants to grow and use energy.

Secondary substances assist this process by keeping the plant alive. Secondary substances are not strictly necessary to plant survival, they just help plants survive.

___________

1. The generators aren’t a good analogy. Hospitals only use them in case of emergency, while secondary substances are always used.
2. CORRECT. This is the best analogy, though
   it’s far from perfect. Primary substances are what allow the plants to function. A plant would be
   at great risk from predators without secondary substances, but it could function. And secondary substances do provide distinctive looks and useful functions, just like paint and taillights
   on cars.
3. It sounds like both components are necessary in this analogy. Secondary substances are not necessary, they’re just useful.
4. This just describes two parts of train brakes. There’s no analogy to secondary characteristics, which are the less necessary part of plants.
5. The storage analogy has no relation to plants.