Compare the following :
(a) Central nerual system (CNS) and Peripheral neural system (PNS).
(b) Resting potential and actions potential .
(c ) Choroid and retina.

Which of the following is incorrect statement with regard to peripheral neural system ?

Which of the following statements concerting the somatic division of the peripheral neural system is incorrect ?

Explain the following : (a) Role of Na^(+) in the gneration of action potential. (b) Mechanism of generation of light- induced inpulse in the retina . (c ) Mechanism through which a sound produces a nerve impulse in the inner ear .

The electric field due to a point charge depends on the distance r as parallely indicate how each of the following quantities depends on r ? (a) Intensity of light from a point source. (b). Electric potential due to a point charge. (c) Electrical potential at a distance r from to centre metallic sphere given r lt radius of the sphere.

Identify the internal and external forces acting on the following systems. (a) Earth alone as a system (b) Earth and Sun as a system (c) Our body as a system while walking (d) Our body + Earth as a system

Write short notes on the following : (a) Neural coordination (b) Forebrain (c) Midbrain (d) Hindbrain (e) Retina (f) Ear ossicles (g) Cochlea (h) Organ or Corti (i) Synapse

Answer the following : (a) Which part of the ear determines the pitch of a sound ? (b) Which part of the human brain is the most developed ? (c ) Which part of our central neural system acts as a master clock ?

Differentiate between the following: (a) Diffusion and Osmosis (b) Transpiration and Evaporation (c) Osmotic Pressure and Osmotic Potential (d) Imbibition and Diffusion (e) Apoplast and Symplast pathways of movement of water in plants. (f) Guttation and Transpiration.

Explain the following, give appropriate reasons. (i) Ionization potential of N is greater than that of O (ii) First ionization potential of C-atom is greater than that of B-atom, where as the reverse is true for second ionization potential. (iii) The electron affinity values of Be and Mg are almost zero and those of N (0.02 eV) and P (0.80 eV) are very low (iv) The formation of F^(-) . (g) from F(g) is exothermie while that of O^(2-) (g) from O (g) is endothermic.