Predict the correct intermediate and product in the following reaction:
$${\text{CH}}_3-\text{C}\equiv \text{CH}\stackrel{{\text{H}}_2{\text{O, H}}_2{\text{SO}}_4,{\text{HgSO}}_4}{\to }\text{Intermediate (A)}\to \text{Product (B)}$$

Which one of the following statements is true?

Which of the following statements is not correct?

Which one of the following statements is correct?

The product formed by the reaction of an aldehyde with a primary amine is:

Which part of the tobacco plant is infected by Meloidogyne incognita?

The term ecosystem was coined by: