Which of the following two changes occur in humans when they move to high altitudes (above $3,500 \ m$)?
$(1)$ Increase in red blood cell size
$(2)$ Increase in red blood cell production
$(3)$ Increase in breathing rate
$(4)$ Increase in thrombocyte count

In humans, respiration occurs in the following steps. Arrange these steps in the correct order.
$A$. Diffusion of $O_2$ and $CO_2$ between blood and tissues
$B$. Diffusion of $O_2$ and $CO_2$ across alveolar membrane
$C$. Pulmonary ventilation by which atmospheric air is drawn in and $CO_2$ rich alveolar air is released out
$D$. Cellular respiration
$E$. Transport of gases by the blood

Mark the incorrect statement.

Statement-$I$: The anatomical setup of the lungs in the thorax is such that any change in the volume of the thoracic cavity will be reflected in the lung cavity.
Statement-$II$: The volume of air remaining in the lungs even after a forcible expiration is called residual volume.

People who have migrated from the plains to an area near Rohtang Pass six months ago will exhibit which of the following characteristics?

Which of the following plants is able to show rolling of leaf during the middle of the day?