Excessive smoking leads to an increase in the concentration of which substance in the blood?

Accumulation of fluoride in plant leaves causes

Adenoids are the lymphoid tissues in which:

Hypoxia is a condition in which tissues receive insufficient oxygen. What is it caused by?

What is the minimum concentration and partial pressure of $CO$ in the alveoli that is dangerous to humans?

Match the names of diseases listed under Column $I$ with their meanings given under Column $II$,and choose the answer that provides the correct combination.

Column $I$ (Name of disease)	Column $II$ (Meanings)
$(A)$ Jaundice	$(p)$ Allergic inflammation of nose
$(B)$ Stenosis	$(q)$ Loss of motor functions
$(C)$ Rhinitis	$(r)$ Heart valve defect
$(D)$ Paralysis	$(s)$ Increase in bile pigments in the blood
	$(t)$ Septal defect of heart