Answer:
The limiting factor is sunlight. The wildflowers bloomed before the leaves appeared on tall trees because they had access to sunlight, but once the tall trees blocked the sunlight with their leaves, the wildflowers couldnt bloom.
The limiting factor in the above case is the sunlight, the absence of which is preventing the growth of wildflowers.
There are various environmental factors that are required for the growth of plants. These include proper sunlight, water and nutrients. Suitable temperature and soil type are also required for the growth of specific species of plants.
The absence of any one of these factors becomes a limiting factor for the growth of plants. That means, that if any of the required factors are missing, plants will not grow.
On a forest floor, wildflowers grow before the leaves on tall trees have grown because, in the absence of leaves, wildflowers were receiving abundant sunlight required for their growth. When leaves started appearing, they blocked the sunlight reaching the wildflowers. Thus the wildflowers were unable to grow.
Therefore, in this case, sunlight became a limiting factor for the growth of wildflowers.
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