Define external fertilization. Mention its disadvantages
Explain why meiosis and gametogenesis are always interlinked?
Higher organisms have resorted to sexual reproduction in spite of its complexity.
Why?
Define
(a) Juvenile phase,
(b) Reproductive phase,
(c) Senescent phase.
What is vegetative propagation? Give two suitable examples.
How does the progeny formed from asexual reproduction differ from those formed by sexual reproduction?
Offspring formed due to sexual reproduction have better chances of survival. Why? Is this statement always true?
Why is reproduction essential for organisms?
Why is the offspring formed by asexual reproduction referred to as clone?
Which is a better mode of reproduction sexual or asexual
Why is reproduction essential for organisms?
A copper wire has a diameter of 2mm. The wire carries a constant current 3A. Assuming the density of electrons to be 8.5*10^28 m^-3. Find the magnitude of a.current density and b.drift velocity?
If three positive real numbers a, b, c are in A.P such that abc =4, then minimum value of b is?
Three numbers are chosen at random without replacement from 1,2,3 ............10. The probability that minimum of chosen number is 4 and their maximum is 8.
The real value of 'a' for which sum of square of the roots of the equation
An electron & a photon have same energy E. Find the ratio of de Broglie wavelength of electron to wavelength of photon. Given mass of electron is m & speed of light is C.
An inductor of inductance 10 mH and a resistance of 5 Om is connected to a battery of 20 V at t = 0. Find the ratio of current in circuit at t = infinity to current at t = 40 sec.
When m gram of steam at 100°C is mixed with 200 gm of ice at 0°C. it results in water at 40°C. Find the value of m in gram .
Magnitude of resultant of two vectors P and Q is equal to magnitude of P . Find the angle between Q and resultant of 2P and Q
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How Steroid hormone Produce
Which organ of the body produces the fluid known as bile?
yellow dust appears on the fingers, whenever we touch the middle of a flower. These tiny yellow grains are one of the most precious substances in nature because they contain the secret of plant life. What is this dust called?
What is air-borne disease?
Which veins have the littlest measurement?
What makes a reptile a reptile?
Parasites are plants that need
Which of coming up next isn't an individual from the nutrient B complex?
Which of coming up next is an enormous vein that diverts blood from the heart
The hysteresis curve for a material is shown in the figure. Then for the material retentivity, coercivity and saturation magnetization respectively will be?
A ring is rotated about diametric axis in a uniform magnetic field perpendicular to the plane of the ring. If initially the plane of the ring is perpendicular to the magnetic field. Find the instant of time at which EMF will be maximum & minimum respectively?
A solid cube of side 'a' is shown in the figure. Find maximum value of 100 b/a for which the block does a not topple before sliding.
Two sources of sound moving with same speed v and emitting frequency of 1400 Hz are moving such that one source s1 is moving towards the observer and s2 is moving away from observer. If observer hears beat frequency of 2 Hz. Then find the speed of source. Given
In YDSE, separation between slits is 0.15 mm, distance between slits and screen is 1.5 m and wavelength of light is 589 nm, then fringe width is?
The surface mass density of a disc of radius a varies with radial distance as
where A & B are positive constants then moment of inertia of the disc about an axis passing through its centre and perpendicular to the plane
A block of mass 10kg is suspended from string of length 4m. When pulled by a force F along horizontal from midpoint. Upper half of string makes 45° with vertical, value of F is
Form a differential equation of family of all the circles having centres on -axis and radius unity?
A is one of 6 horses entered for a race and is to be ridden by one of two jokceys B and C.It is 2 to 1 that B rides A, in which case all the horses are equally likely to win .If C rides A, his chances of winning is trippled . what are the odds against winning of A?
Two circle with radii r1 and r2(r1> r2 >=2) touch each other externally. if 
be the angle between the direct common tangents, then is?
The equation of the circle which has tangent 2x -y -1 =0 at (3,5) on it and with the centre on x+y =5, is?
If two circles, each of radius 5 unit, touch each other at (1,2) and equation of their common tangent is 4x + 3y =0 ,then equation of the circle a portion of which lies in the all the quadrants is?
The centre of a circle is (2, -3) and the circumference is 10 pie. The equation of circle is?
The equation of the circle radius 5 in the first quadrant which touches x- axis and the line 4y = 3x is?
The slope of the tangent at the point (h,h) on the circle
is?
A lift of mass 920 kg has a capacity of 10 persons. If average mass of person is 68 kg. Friction force between lift and lift shaft is 6000 N. The minimum power of motor required to move the lift upward with constant velocity 3 m/s is
An inductor of inductance 10 mH and a resistance of 
is connected to a battery of 20 V at t = 0. Find the ratio of current in circuit at t = infinity to current at t = 40 sec.
Find the dimension of 
A capacitor of 60 pF charged to 20 volt. Now battery is removed and then this capacitor is connected to another identical uncharged capacitor. Find heat loss in nJ.
A battery of unknown emf connected to a potentiometer has balancing length 560 cm. If a resistor of resistance
is connected in parallel with the cell the balancing length change by 60 cm. If the
internal resistance of the cell is 
, the value of 'n' is