A freshwater plant such as water lily can solve the problem of buoyancy by the...

Explanation

Water lilies are freshwater plants that grow in ponds, lakes, and slow-moving streams. These plants have to deal with the issue of buoyancy, which means they need to stay afloat in water. The question is asking how water lilies solve this problem. Option A states that water lilies have aerenchymatous tissues. Aerenchymatous tissue is a type of plant tissue that contains air spaces. These air spaces allow for better oxygen diffusion and gas exchange between the roots and the rest of the plant. In water lilies, these tissues also help them stay afloat in water by providing buoyancy. Option B mentions dissected leaves, which means the leaves of the plant are divided into smaller parts. However, this characteristic does not help with buoyancy. Option C refers to the thin cell walls of the epidemic. This option is incorrect as it contains a typographical error. The intended term was likely epidermis, which is the outermost layer of cells in the plant. However, having thin cell walls in the epidermis does not aid in buoyancy. Option D describes a water-repelling epidermis, which means the outer layer of the plant is designed to repel water. Although this characteristic can help prevent water loss in the plant, it does not help with buoyancy. Therefore, the correct answer is Option A, which states that water lilies have aerenchymatous tissues to help with buoyancy.