- ANon$-$biodegradable pollution.
- ✓Biodegradable pollution.
- CEffluents.
- DAir pollution.
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$I$. Lymph node $II$. Thymus gland
$III$. Red bone marrow $IV$. liver
$V$. Spleen $VI$. Osteocytes
$VII$. Peyer's patches
The correct option with correct choices is
$(a)$ No enzyme at all
$(b)$ The normal/less efficient enzyme
$(c)$ $A$ non-functional enzyme
$R$ : They act on all trophic levels of a food chains.
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 :