Name the primary and secondary lymphoid organs.

A primary key is a field that identifies each record in a database table admitting that the primary key must contain its UNIQUE values.  A secondary key shows the secondary value...

Answer is (C) 1 and 2

Answer is (C) Man

1. Primary productivity - productivity at producer level  2. Secondary productivity – productivity at consumer level

Primary treatment involves the removal of large sized floating and suspended solids by physical methods, while secondary treatment involves decomposition of organic matter by microbial action.

d. Both assertion and reason are false.

(iii) Assertion is correct statement but reason is wrong statement.

The rate of succession is much faster in secondary succession as the substratum (soil) is already present as compared to primary succession where the process starts from a bare area...

(c) Both A and R are correct and R is correct explanation of A.

Correct Answer - B Both (A) to (R) are correct but (R) is not correct explanation of (A).