Question

does the text contain a vague pronoun refer?
they are researching a hybrid south african tobacco plant that may decrease reliance on fossil fuels. it contains oily seeds that can be transformed into sustainable biofuel.
yes
no

Explanation:

The text has the pronoun "They" and "It". "They" is used to refer to the researchers (implied, but the reference is not clearly defined in the given text snippet), and "It" refers to the hybrid South African tobacco plant. Since the reference of "They" is vague (we don't know exactly who "They" are from just this text), the text contains a vague pronoun reference.

Answer:

yes