If you see a diseased plant, it is most likely in the stage of its life cycle.

The correct answer is SEED STAGE.

Explanation:

During this stage, a plant is susceptible to diseases if seedlings were grown without nitrogen. If this is the case they are smaller than others. Nitrogen is used to make proteins, which works for growth and repair. Seedlings grown without magnesium will have a yellow color and will be smaller. Magnesium produces chlorophyll, which is essential for photosynthesis.

The life cycle of a plant begins when a seed touches the ground. the major stages of the flower life cycle are the seed, germination, growth, reproduction, pollination and seed spreading stages.

because photosynthesis could not occur (apex)