PrepTest 122, Section 3, Question 21
Every culture that has adopted the cultivation of(465 more words not shown)
Which one of the following(9 more words not shown)
- AThe greater productivity(30 more words not shown)
- BBecause of their(30 more words not shown)
- CC-4 photosynthesis, which(26 more words not shown)
- DThe presence of(32 more words not shown)
- ESome of the(27 more words not shown)
Reading the passage
We've already predicted the explanation: maize produces so much because its C-4 process keeps oxygen from interfering with rubisco and sugar production. Look for that connection between the mechanism and productivity, even if the answer describes it differently.
Working the answers
- ACorrect
This states the greater productivity and explains it through protection from excess oxygen. That's the central connection we predicted.
- B
Cultural influence sets up the question of why maize is so productive. This answer stops at that influence instead of supplying the main biochemical explanation. It also adds higher-quality nutrients; producing more food doesn't establish that the food is more nutritious.
- C
The advantage isn't more efficient use of atmospheric hydrogen. The account obtains hydrogen from water and explains how C-4 protects sugar production from oxygen. C substitutes a different mechanism for the one we're explaining.
- D
Rubisco's presence isn't the special protection. Rubisco participates in the general process described in paragraph two and is vulnerable to oxygen. Separating it from oxygen explains the C-4 advantage.
- E
This sounds close until “entering the plants' leaves.” The gases are kept out of particular cells inside the leaf, not the whole leaf. That change makes the proposed explanation inaccurate; merely describing protection isn't enough if we put the barrier in the wrong place.
More Main Point questions
Learn the LSAT our way
Our platform drills Main Point questions at your level and adjusts as you improve.