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Number 1. the flower; it has a reproductive function. They are the reproductive organs of the plant. They mediate sperm contained within pollen, to the ovules contained in the ovary.

Number 2. the leaf; their primary function is photosynthesis -manufacturing food for plants

Number 3. the stem; it's function is to provide support for leaves and flowers, they conduct water and nutrients from the roots and food in the form of glucose from the leaves to other plant parts.

Number 4. the roots; their function is to absorb water and minerals from the soil, anchor the plant in the soil and to store extra food for future use.

Explanation:

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any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.