. . . . . . in the lungs provide a very large surface area for gaseous exchange.

In the following questions, a statement of Assertion is given followed by a corresponding statement of Reason. Mark the correct answer as:
Assertion: $Larynx$ passes air to the $pharynx$.
Reason: $Pharynx$ produces sound.

An experiment is set up as shown. Flasks $1$ and $2$ contain lime water. Air is pumped through the flasks. What is the appearance of lime water in flasks $1$ and $2$ after a period of ten minutes?

Option	Flask $1$	Flask $2$
$(a)$	Clear	Clear
$(b)$	Clear	White/ Cloudy
$(c)$	White/ Cloudy	Clear
$(d)$	White/ Cloudy	White/ Cloudy

Why must the respiratory surface of animals always be moist?

Which substances are produced by anaerobic respiration in yeast?

Substance	Carbon Dioxide	Alcohol	Lactic Acid	Water
$(a)$	$\checkmark$	$\checkmark$	$\times$	$\times$
$(b)$	$\checkmark$	$\times$	$\checkmark$	$\times$
$(c)$	$\times$	$\checkmark$	$\times$	$\checkmark$
$(d)$	$\times$	$\times$	$\checkmark$	$\checkmark$

Which of the following is known as the energy currency of the cell in biology?