Question

These animals are with simplest body plan and are called as 'Sponges'. They bear numerous pores on their body. Those pores are called ...........

Answer 1

The animals with simplest body plan are called as 'Sponges'. They bear numerous pores on their body. Those pores are called Ostia. Water flows in and out of of sponges through Ostia. Along with water, required nutrients also flows in through it.