When a molecule moves across a membrane independently of other molecules,the process is called ...........

In mass flow,various substances move independently according to their

Analogy type question:
$(1)$ Active transport : Energy requirement from $ATP$ :: Passive transport : ........

Choose the correct option for $P, Q$ and $R$.

Property	Simple Diffusion	Facilitated Transport	Active Transport
Transport Saturation	$P$	Yes	Yes
Uphill Transport	No	No	$Q$
Requirement of Energy	No	$R$	Yes

$P, Q$ and $R$ respectively are:

Identify the following process and choose the correct option.

Choose the correct sentences for diffusion:
$(1)$ In diffusion,molecules move in a random fashion.
$(2)$ Diffusion rates are affected by the gradient of concentration.
$(3)$ Diffusion is a slow process and is dependent on a 'living system'.
$(4)$ Movement by diffusion is passive.