Question

what will happen if all the phytoplanktons are eliminated from a pond

Answer 1

As we know sun is the ultimate source of energy for the earth. If we consider pond as separate place or ecosystem then source of energy of pond is also sun.

Sun provide energy in form of light energy. Only plants are able to convert that light energy into chemical energy or organic food by the process of photosynthesis. Phytoplanktons are very small members of plant kingdom. Phytoplanktons make food for pond ecosystem and functioning as producer. Zooplankton and small animals and fishes use phytoplanktons as food and these animals eat by higher fishes and complete the food chain . As we can see if phytoplanktons are not there nobody can survive.

Answer 2

Phytoplanktons are the small aquatic plants which are the producers in pond ecosystem. Like all other producers, phytoplanktons converts solar energy into chemical energy which is circulated in the ecosystem. In pond ecosystem, the phytoplanktons are consumed by zooplanktons which are small aquatic animals which are further consumed by small fishes and than the larger ones. In this way we can see that phytoplanktons make the base of pond ecosystem on which whole of the pond ecosystem depends. So it's obvious that eliminating phytoplanktons from pond ecosystem will destroy the complete pond ecosystem, restricting the flow of energy in the ecosystem and no organism of pond ecosystem will be able to survive.