#25 - Global Reference, Must Be True

[lsatquestions]

I see why D is correct, but please help me eliminate A.

The last paragraph says C-4 "plants separate the places where they split water atoms into hydrogen and oxygen from the places where they build sugars from carbon dioxide" and "oxygen and all other atmospheric gases are excluded from the cells containing rubisco."

[Adam Tyson]

You're correct about those statements, lsatquestions , but check out this section of the text, from the third paragraph:

These plants separate the places where they split water atoms into hydrogen and oxygen from the places where they build sugars from carbon dioxide. Water molecules are split, as in all plants, in specialized chlorophyll-containing structures in the green leaf cells, but the rubisco is sequestered within airtight tissues in the center of the leaf.

There are two "rooms" here - the room that holds the rubisco, and the room where water is split up. Answer A is talking about the water room, but the text you correctly referred to is about the rubisco room! They pulled a bait-and-switch on us! Very sneaky and mean of them.