Refer to the table below, in which the presence (+) or absence (-) of certain types of organelles in five sample human cells is indicated. A blank does not signify the absence of an organelle, just its relative lack of importance when compared to the importance of other organelles.
Identify the correct options for:
I. Cell which secretes proteins.
II. Mature red blood corpuscles
III. A haploid cell
(correct answer + 2, wrong answer - 0.50)