Teaching BPSC 4.0 बिहार उच्च माध्यमिक शिक्षक भर्ती (PGT) Mock Test General Science Biology Human body
Lymphoid organs play a crucial role in immunity. Which among the following is a primary lymphoid organ?
1
Lymph nodes
2
Bone marrow
3
Peyer's patches
4
More than one of the above
5
None of the above