Microbes in Human Welfare — BIOLOGY STD 12 Science — Question

$(A)$ Bears go into ___$(1)$___ during winter to ___$(2)$___ cold weather.

$(B)$ A conical age pyramid with a broad base represents ___$(3)$___ human population.

$(C)$ A wasp pollinating a fig flower is an example of ___$(4)$___ .

$(D)$ An area with high levels of species richness is known as ___$(5)$___ .

Which one of the following options, gives the correct fill ups for the respective blank numbers from $(1) $ to $(5)$ in the statements ?

Statement $I$ : Bone marrow is the main lymphoid organ where all blood cells including lymphocytes are produced.

Statement $II$ : Both bone marrow and thymus provide micro environments for the development and maturation of T-lymphocytes.

In the light of above statements, choose the most appropriate answer from the options given below :