Science

Which are the simplest animals to have a nervous system and a gut?
Cnidarians

Which are the simplest three layered animals alive today?
Flat worms

Gordian worms are also known as
Hair worms

The name of which phylum is derived from a Greek word meaning ‘Sea nymph’?
Nemertinea

Which animal has only one opening which serves both as mouth and anus?
Cnidarians

What are the stinging cells on the tentacles of corals, sea anemones, jelly fish and hydra called?
Nematocysts

What are the soft internal partitions of a coral polyp or sea anemone called?
Mesenteries

Which simple animals has helped the scientist to deduce that there were 400 days in a year, 300 million years ago?
Coral

Corals are best known for the massive ‘rocky’ reefs they built in the tropics. Which is the largest such reef made by them?
Great Barrier Reef

Why are ‘soft’ corals so colorful?
Because of colored rods or spines in their tissues