Which fibres carry impulses between gyri of the same hemisphere, between gyri in opposite hemispheres, and between brain and spinal cord?

Cross between two species of the same genus is

Distinguish between : Cranial nerves and spinal nerves

Crosses between, the plants of the same variety are called

Differentiate between Red and white muscle fibres

The structure that acts as middle man between brain and effectors is

A smooth hemisphere of mass M is kept on a smooth surface. A block of mass m ( = M//3) is kept on the top of the hemisphere as shown in the figure. The hemisphere is displaced slightly ang both the hemisphere and the block starts moving. At an angle theta with the vertical ( subtended by the block at the centre of the hemisphere ) , the relation between the velocity of the block ( V) and the velocity of the hemishere ( v_(0) ) is (V is the velocity of the block w.r.t. the hemisphere at that instant . )

What is the difference between elastomers and fibres ?

The part of the brain which is connected to spinal cord is

Two solid hemispheres of radii R and (R )/(2) with centers O and O' respectively as shown in figure. The density of bigger hemisphere is rho and that of smaller hemisphere is 2rho . Taking center of bigger hemisphere is at origin and the distance between centres of two hemisphere OO' is (R)/(10) find co - ordinates of center of mass of the system.

In the same figure, equivalent resistance between points A and D is