Transport pumps and gated ion channels can operate only in the nodes of Ranvier of medullated nerve fibres. Give reason.

In a medullated nerve fibre, the conduction of impulses takes place at a fast rate. Give reason.

Give reasons: Oxygen cycle can not operate in nature in the absence of green plants.

Find the odd one out and give reason: Epithelium, Muscle fibre, Nerve fibre, Epidermis.

Consider an optical communication system operating at lambda=800 nm . Suppose, only 1% of the optical source frequency is the available channel bandwidth for optical communication. How many channels can be accommondated for transmitting audio signals requiring a bandwidth of 8kHz

Give scientific reasons : One can sense colours only in bright light .

In optical communication system operating at 1200nm, only 2% of the source frequency is available for TV t ransmission having a bandwidth of 5 MHz. the number of TV channels that can be transmitted is

Give scientific reasons: One can sense colours only in bright light.