Reading Passage 1: "William Kamkwamba"

Explanation: 
(A) is wrong because no comparison is made between numbers of 
patroller or forager ants;
(C) is wrong because foragers bring back the food and no mention is made of
patrollers carrying food;
(D) is wrong because we do not know how long any of the ants spend outside of 
the nest.
Q 5. In an experiment, Deborah Gordon’s team
Answer: 
A mimicked patroller ants returning to the nest.
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Part of the passage:
 
To see how this works, Gordon and her team captured patroller 
ants as they left a nest one morning. After waiting half an hour, 
they simulated the ants’ 
return by dropping glass beads into the nest entrance at regular intervals – some coated 
with patroller scent
, some with maintenance worker scent, some with no scent. Only the 
beads coated with patroller scent stimulated foragers to leave the nest.
Explanation: 
(B) is wrong because the researchers did not use food;
(C) is wrong because they captured the patrollers ants, they didn’t follow them;
(D) is wrong because they added different scents to beads, not to the ants.
Questions 6 – 9
Q 6. Approximately …………… different types of ant have been identified.
Answer: 
12,000
Part of the passage:
 
How do we explain, then, the success of Earth’s 
12,000 
or so 
known ant species? 
Q 7. Ants use their …………… to identify another ant.