Which of these is cocci bacteria occurring in pairs?

Refer to the given figures of bacteria ($X, Y$ and $Z$) and read the statements (i, ii and iii) regarding them. Based on the given information, identify the bacteria and select the correct option.

(i) Bacteria $X$ causes cholera.
(ii) Bacteria $Y$ causes a disease which disrupts proper exchange of gases.
(iii) Bacteria $Z$ converts lactose sugar of milk into lactic acid.

The bacteria shown in the following picture belongs to the category_____.

Refer to the given figures and select the incorrect statement regarding them.

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$

By observing following figure find correct match. With example.

Examples
(i) Vibrio
(ii) Spirillum
(iii) Bacillus
(iv) Micrococcus roseus & Diplococcus pneumoniae