Name the primary and secondary lymphoid organs.

Define primary and secondary pollutants

Consider the following statements. I) Secondary lymphoid organs includes lymph nodes, spleen and small masses or lymph tissue such as Peyer's patches, appendix and thymus. II) The secondary lymphoid organs are the site of lymphocyte maturation and they efficiently trap antigens for exposure to T and B-cells. Which of the statements given above is/are correct?

Define plant succession. Differentiate primary and secondary successions.

The number of turns in primary and secondary coils of a transformer is 50 and 200 respectively .If the current in the primary coil is 4 A then the current in the secondary coil is

Distinguish between primary and secondary cells used as batteries.