Choose the INCORRECT statement/statements? (i) The brain stem joins the brain with the spinal cord.

(ii) The right hemisphere of the brain controls the left side of the body.

(iii) Our sense organs are controlled by cerebellum.

(iv) The pigments in our pupil give colour to the eyes.

Only (i) and (ii)

Only (ii) and (iii)

Only (i) and (iii)

Only (iii) and (iv)

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.

how important do you think an instrument is to the musician who plays it?