Most of the petrocrops belong to family of:
Euphorbiaceae.
The correct option is option D.
Explanation of the correct option:
Explanation of the incorrect options:
Option A:
In the Rutaceae family plants like lemon and orange are included.
Option B:
In the Malvaceae family mucilage secreting plants are included,e.g. hibiscus.
Option C:
Leguminosae family is also known as the pea family.
Final answer: Most of the petrocrops belong to the family of Euphorbiaceae.