Biology
General
Easy
Question
The ultimate source of organic evolution is
- Natural selection
- Sexual reproduction
- Hormonal action
- Mutations
The correct answer is: Mutations
Related Questions to study
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If
are in A.P with common difference
then sind
terms] 
If
are in A.P with common difference
then sind
terms] 
Maths-General
Maths-
The sum of all integers between 50 and 500 which are divisible by 7 is
The sum of all integers between 50 and 500 which are divisible by 7 is
Maths-General
Maths-
digits )=
digits )=
Maths-General
maths-
In a
as shown in figure given that
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In a
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A bob of mass M is suspended by a massless string of length L. The horizontal velocity
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at position A is just sufficient to make it reach the point B. The angle
at which the speed of the bob is half of that at A, satisfies

physics-General
physics-
A particle of mass
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and
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and
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physics-General
physics-
A bob of mass
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physics-General
physics-
A body of mass
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physics-General
Physics-
Figure shows four paths for a kicked football. Ignoring the effects of air on the flight, rank the paths according to initial horizontal velocity component, highest first

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Physics-General
physics-
A boy throws a cricket ball from the boundary to the wicket-keeper. If the frictional force due to air cannot be ignored, the forces acting on the ball at the position X are respected by

A boy throws a cricket ball from the boundary to the wicket-keeper. If the frictional force due to air cannot be ignored, the forces acting on the ball at the position X are respected by

physics-General
physics-
In a two dimensional motion of a particle, the particle moves from point
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, respectively, then find the magnitude of the displacement vector

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, position vector
. If the magnitudes of these vectors are respectively,
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physics-General
Physics-
A particle is moving on a circular path of radius
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to
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Physics-General
Physics-
From an inclined plane two particles are projected with same speed at same angle
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Physics-General
physics-
A string of length
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revolutions per
around the vertical axis through the fixed end as shown in figure , then tension in the string is
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physics-General
physics-
A piece of wire is bent in the shape of a parabola
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-axis with a constant acceleration
. The distance of the new equilibrium position of the bead, where the bead can stay at rest with respect to the wire, from the
-axis is

A piece of wire is bent in the shape of a parabola
-axis vertical) with a bead of mass
on it. The bead can side on the wire without friction. It stays at the lowest point of the parabola when the wire is at rest. The wire is now accelerated parallel to the
-axis with a constant acceleration
. The distance of the new equilibrium position of the bead, where the bead can stay at rest with respect to the wire, from the
-axis is

physics-General