The most important part of the plant that helps in the continuation of the life of a particular species is
flower
The correct option is D:
Explanation of correct option-
Explanation of incorrect option:
Option A-
Stem plays an important role in the conduction of food and water and minerals.
Option B-
Leaves play an important role in the photosynthesis process.
Option C-
Roots play an important role in absorbing water and minerals from the soil and help in conduction from the roots to upward aerial parts of the plant
Final answer: The most important part of the plant that helps in the continuation of the life of a particular species is the flower.