All reproductive tract infections or RTIs are STDs but all STDs are not RTIs. Justify with example.

All the ores are minerals but all the minerals are not ores. Justify the statement.

“All vertebrates are chordates but all chordates are not vertebrates”. Justify the statement.

STDs are a threat to reproductive health. Describe any two such diseases and suggest preventive measures.

All the organisms have not been yet identified. Justify the statement.

All the five bonds in PCl_5 are not equivalent. Justify.

Are the square roots of all positive irrational? If no, give examples.