Is the given figure of an angiosperm plant a dicot or a monocot? Differentiate between dicot and monocot plants on the basis of venation in the leaf and the number of cotyledons in the seed.

Name two mammals which lay eggs. Between which two phyla do they serve as connecting link? Name a mammal which gives birth to poorly developed young ones.

The 'Origin of Species' was written by:

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.

Which of the following is not a criterion for classification of living organisms?

Enlist four main features of organisms placed in the kingdom Protista.