Name a marine animal with calcareous spicules?

Who is called as Farmer's friend?

The branch of science which deals with plants and animals is

The plant which is seen in moist areas and in sea

The umbrella like structures seen growing on bark of trees during rainy season is

Name a plant with parallel venation ?

I am small, and have no shape and unicellular. who am I?

Human being is a

Who discovered bacteria?

Who wrote the book 'Origin of species'?