Q8. JOINT CSIR-UGC NET (LIFE SCIENCES) (Practice set 2) Based on Nitrogen cycle.


The nodulation (nod) genes are classified as common nod genes or host specific nod genes. Some statements related to such classification are given below:

1. nodA is a common nod gene and nodC is a host specific gene.

2. nodB is a common nod gene and nodP is a host specific gene.

3. nodQ is a common nod gene and nodA is a host specific gene.

4. nodH is a common nod gene and nodQ is a host specific gene.

Choose the correct answer from the above statements:

A. 1. and 2.

B. 3 and 4

C. only 2.

D. only 1.