The book $Systema \text{ } Naturae$ was written by:

What do you understand by the term $diploblastic$? Give one example of an organism that is $diploblastic$.

Well-defined nucleus is absent in

Write appropriate terms for the following:
$(i)$ Animals that are able to maintain a constant body temperature over a wide range of environmental temperatures.
$(ii)$ Animals which have a pseudocoelom.
$(iii)$ Plants which bear naked seeds.

List the basic criteria for classifying the Plantae kingdom into various groups. Identify the following specimen given in the image and write its characteristic features.

The system of scientific naming was introduced by