take part vs. take portion

[Leonhard]

Common Errors in English, Advanced Level

ESL/EFL Test #6 "At the Conference", question 2

Probably the most interesting meeting of the whole week was the one when everybody had the opportunity to take portion.

(a) Probably
(b) the whole
(c) had
(d) portion

Common Errors in English, Advanced Level

ESL/EFL Test #6 "At the Conference", answer 2

Probably the most interesting meeting of the whole week was the one when everybody had the opportunity to take part.

Correct entry: part
The error was: (d) portion
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What is portion here?

Leonhard

[Mister Micawber]

.
Wrong. Its space should be filled by 'part'.
.
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Native English teacher at Mister Micawber's