Home
Class 12
BIOLOGY
[A] : Every biological system resists a ...

[A] : Every biological system resists a change and wants to remain in a state of equilibrium .
[R] : Climax communities of an ecosystem are produced after several changes it has gone through succession .

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

Text Solution

AI Generated Solution

Promotional Banner

Topper's Solved these Questions

  • Drug Addiction

    TRUEMEN BIOLOGY ENGLISH|Exercise ASSERTION AND REASON|20 Videos

  • ECOSYSTEM

    TRUEMEN BIOLOGY ENGLISH|Exercise MCQ|178 Videos

Similar Questions

Explore conceptually related problems

Go through the following statements. (i) In proteins, right handed and left handed helices are observed (ii) In B-DNA, at each step of ascent, the strand turns 36^(@) . (iii) Living process is a steady - state in equilibrium. (iv) The rate of reaction doubles or decreas- es by half for every 10^(@) C change in ei- ther direction. Find out the correct statement ?

A ball is projected on a very long floor. There may be two conditions (i) floor is smooth & (ii) the collision is elastic If both the considered then the path of ball is as follows. Now if collision is inelastic and surface is rough then the path is as follows. Successive range is decreasing . Roughness of surface decreases the horizontal component of ball during collision and inelastic nature of collision decreases the vertical component of velocity of ball. In first case both components remain unchanged in magnitude and in second case both the components of the velocity will change. Let us consider a third case here surface is rough but the collision of ball with floor is elastic. A ball is projected withe speed u at an angle 30^(@) with horizontal and it is known that after collision with the floor its speed becomes (u)/(sqrt(3)) . Then answer the following questions. If the ball after first collision with the floor has rebounded vertically then the speed of the ball just after the collision with the floor would have been :

A conducting ring of mass m and radius r has a weightless conducting rod PQ of length 2r and resistance 2R attached to it along its diametre. It is pivoted at its centre C with its plane vertical, and two blocks of mass m and 2m are suspended by means of a light inextensible string passing over it as shown in Fig. The ring is free to rotate about C and the system is placed in magnetic field B (into the plane of the ring). A circuit is now complete by connecting the ring at A and C to a battery of emf V. It is found that for certain value of V , the system remains static. In static condition, find the current through rod PC.

A conducting bolloon of the radius a is charged to potential V_(0) and held at a large height above the earth ensures that charge distribution on the surface of the balloon remains unaffected by the presence of the earth. It is connected to the earth through a resistance R and a value in the balloon is opened . The gas inside the balloon escapes from value and the size of the balloon decreases. The rate of decrease in radius of the balloon is controlled in such a manner that potential of the balloon remains constant. Assume the electric permittivity of the surrounding air equals to that of free space (epsilon_(0)) and charge cannot leak to the surrounding air. The rate at which radius r of the balloon changes with time is best represented by the equation

Free enegry , G = H - TS , is state function that indicates whther a reaction is spontaneous or non-spontaneous. If you think of TS as the part of the system's enegry that is disordered already, then (H -TS) is the part of the system's energy that is still ordered and therefore free to cause spontaneous change by becoming disordered. Also, DeltaG = DeltaH - T DeltaS From the second law of thermodynamics, a reaction is spontaneous if Delta_("total")S is positive, non-spontaneous if Delta_("total")S is negative, and at equilibrium if Delta_('total")S is zero. Since, -T DeltaS = DeltaG and since DeltaG and DeltaS have opposite sings, we can restate the thermodynamic criterion for the spontaneity of a reaction carried out a constant temperature and pressure. IF DeltaG lt 0 , the reaction is spontaneous. If DeltaG gt 0 , the reaction is non-spontaneous. If DeltaG = 0 , the reaction is at equilibrium. Read the above paragraph carefully and answer the following questions based on the above comprehension. A particular reaction has a negative value for the free energy change. Then at ordinary temperature

PQRS is a square region of side 2a in the plane of paper. A uniform magnetic field B, directed perpendicular to the plane of paper and into its plane is confined within this square region. A square loop of side 'a' and made of a conducting wire of resistance R is moved at a constant velocity vec(v) from left to right in the plane of paper as shown. Obviously, the square loop will enter the magnetic field at some time and then leave it after some time. During the motion of loop, whenever magnetic flux through it changes, emf will be induced resulting in induced current. Let the motion of the square loop be along x-axis and let us measure x coordinate of the centre of square loop from the centre of the square magnetic field region (taken as origin). Thus, x coordinate will be positive if the centre of square loop is to the right of the origin O (centre of magnetic field) and negative if centre is to the left. For x = a//4 (i) magnetic flux through the loop, (ii) induced current in the loop and (iii) external force required to maintain constant velocity of the loop, will be

PQRS is a square region of side 2a in the plane of paper. A uniform magnetic field B, directed perpendicular to the plane of paper and into its plane is confined within this square region. A square loop of side 'a' and made of a conducting wire of resistance R is moved at a constant velocity vec(v) from left to right in the plane of paper as shown. Obviously, the square loop will enter the magnetic field at some time and then leave it after some time. During the motion of loop, whenever magnetic flux through it changes, emf will be induced resulting in induced current. Let the motion of the square loop be along x-axis and let us measure x coordinate of the centre of square loop from the centre of the square magnetic field region (taken as origin). Thus, x coordinate will be positive if the centre of square loop is to the right of the origin O (centre of magnetic field) and negative if centre is to the left. For x = -9a//5 , magnitude of induced current and its direction as seen from above will be:

PQRS is a square region of side 2a in the plane of paper. A uniform magnetic field B, directed perpendicular to the plane of paper and into its plane is confined within this square region. A square loop of side 'a' and made of a conducting wire of resistance R is moved at a constant velocity vec(v) from left to right in the plane of paper as shown. Obviously, the square loop will enter the magnetic field at some time and then leave it after some time. During the motion of loop, whenever magnetic flux through it changes, emf will be induced resulting in induced current. Let the motion of the square loop be along x-axis and let us measure x coordinate of the centre of square loop from the centre of the square magnetic field region (taken as origin). Thus, x coordinate will be positive if the centre of square loop is to the right of the origin O (centre of magnetic field) and negative if centre is to the left. External force required to maintain constant velocity of the loop for x = -(9)/(5) a will be

TRUEMEN BIOLOGY ENGLISH-Ecology -ASSERTION AND REASON
  1. [A] : The community that ends in a succession is known as climax commu...

    Text Solution

    |

  2. [A] : A biotic community exhibits adaptive radiation . [R] : The org...

    Text Solution

    |

  3. [A] : Every biological system resists a change and wants to remain in ...

    Text Solution

    |

  4. [A] : Allopatric species are geographically isolated whereas sympatric...

    Text Solution

    |

  5. [A] : Natural populations are capable of an enormous and rapid increas...

    Text Solution

    |

  6. [A] : In mutualism both the individuals are benefitted . [R] : Both ...

    Text Solution

    |

  7. [A] : Stenothermal species can tolerate narrow range of temperatures ....

    Text Solution

    |

  8. [A] Eurythermic plants can withstand wide range of temperature . [R...

    Text Solution

    |

  9. [A] : Light is the energy which is stored as chemical energy in the fo...

    Text Solution

    |

  10. [A] : Flora and Fauna of different parts of the world do not show unif...

    Text Solution

    |

  11. [A] : A species is an interbreeding population which is reproductively...

    Text Solution

    |

  12. [A] : Mimicry is a device adopted to protect the organism from its ene...

    Text Solution

    |

  13. [A] : Biological magnification is concentration of substances instead ...

    Text Solution

    |

  14. [A] : The rate of energy storage at consumer levels are referred to as...

    Text Solution

    |

  15. [A] : Primary productivity is shown by green plants only . [R] : Pri...

    Text Solution

    |

  16. [A] : Energy pyramid is sloping . [R] : The energy of one trophic le...

    Text Solution

    |

  17. [A] : The biotic community and the non living enviroment of an ara fun...

    Text Solution

    |

  18. [A] :Green plants ara secondary consumers [R]: Microconsumers break...

    Text Solution

    |

  19. [A] : A food chain is a group of organism in which there is a transfer...

    Text Solution

    |

  20. [A] : Food chains are not paths of energy flow throgh and ecosysterm. ...

    Text Solution

    |