Home
Class 12
BIOLOGY
[A]: Hill and Bendall proposed Z-scheme ...

[A]: Hill and Bendall proposed Z-scheme and suggested that photosystems operate in series.
[R]: The light-dependent reactions require the participation of two light gathering units called PS-I and PS-I I.

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

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • Plant Morphology & Reproduction

    TRUEMAN BIOLOGY|Exercise ASSERTION AND REASON|62 Videos
  • PRINCIPLES OF INHERITANCE AND VARIATIONS

    TRUEMAN BIOLOGY|Exercise MCQs|343 Videos

Similar Questions

Explore conceptually related problems

Through which of the following substances the photosystem-I passes an electron to NADP during light reactions

[A]: The evolution of molecular oxygen is con- cerned with photosystem-1 (PS-I). [R]: The photosystem-11 (PS-II) is not involved in the evolution of oxygen

Statements A-bands of the muscle are dark and contain myosin I-band are the light bands and contain action During muscle contration the A-band contracts The part between the two Z-lines is called as saromere The central part of thin filament, not over-lapped by thick filament is called H-zone of the above statements.

The french physicist Louis de Broglie in 1924 postulated that matter like radiation show a dual behaviour . He proposed the following relationship between the wavelength lamda of a material particle its linear momentum p and planck constant h lamda=h/p =h/(mv) The de broglie relation implies that the wavelength of a particle should decreases as its velocity increases . it also implies that for a given velocity heavier particles should have shorter wavelength than lighter particles. The waves associated with particles in motion are called matter waves or de broglie waves. These waves differ from the electromagnetic waves as they (i) have lower velocities (ii) have no electrical and magnetic fields and (iii) are not emitted by the particle under consideration . The experimental confirmation of the de-broglie relation was obtained when Davisson ans Germer in 1927 observed that a beam of electrons is diffracted by a nickel crystal . as diffraction a characteristics property of waves hence the beam of electron behaves as a wave, as proposed by de-broglie. de- Broglie wavelength of an electron travelling with speed equal to 1% of the speed of light

Read the following four statement A,B,C and D and select the right opition having both correct statements. statements (a) Z scheme of light raction takes place in presence of PS I only . (B ) Omly PS I is functional in cyclic photosporylation (c ) Cyclic photophosphorylation results into synthesis of ATP and NADPH_(2) (D ) Stroma lamllae lack PSII as welll as NADP

When waves from two coherent source of amplitudes a and b superimpose , the amplitude R of the resultant wave is given by R = sqrt(a^(2)+b^(2)+2ab cos phi). where phi is the constant phase angle between the two waves. The resultant intensity I is directly proportional to the square of the amplitude of the resultant wave i.e I prop R^(2) i.e, I prop (a^(2) +b^(2) +2ab cos phi ) For constructive interference , phi = 2n pi " ""and"" " I _("max") = (a+b)^(2) For destructive interference , phi = (2n-1) pi "and" I_("min") = (a-b)^(2) If I_(1) I_(2) are intensities from two slits of width w_(1) "and" w_(2) then I_(1)/I_(2)=w_(1)/w_(2)=a^(2)/b^(2) Light waves from two coherent sources of intensity ratio 81 : 1 produce interference. With the help of the passage choose the most appropriate alternative for each of the following questions The ratio of slit widths of the two sources is

This question has statement I and Statement II . Of the four choices given after the statements, choose the one that best describes the two Statements. Statement-I:Cj,promotion of ethylbenzene with Cl_2 in presence of heat and light mainly yields 1-chloro-2- phenylethane. Statement-II:The reaction occurs through intermediate formation of the radical, C_6H_5CHCH_3 .

TRUEMAN BIOLOGY-Plant Physiology -ASSERTION AND REASON
  1. [A]: Tropical movements occuring in response to water stimulus are cal...

    Text Solution

    |

  2. [A]: The evolution of molecular oxygen is con- cerned with photosystem...

    Text Solution

    |

  3. [A]: Hill and Bendall proposed Z-scheme and suggested that photosystem...

    Text Solution

    |

  4. [A]: Rhizobial aggregates have been observed at distinct sites on curl...

    Text Solution

    |

  5. [A]: Light is very important external factor of transpiration. [R]:...

    Text Solution

    |

  6. [A]: Wax, resin and suberin coating on the surface of plant parts redu...

    Text Solution

    |

  7. [A]: Gibberellic acid when added to isolated aleurone layer, induces a...

    Text Solution

    |

  8. Assertion : Auxillary buds, in actively growing herbaceous plants, gen...

    Text Solution

    |

  9. Assertion : If you burn a plant , its nitrogen component is given of...

    Text Solution

    |

  10. [A]: Amino acids are converted into ammonia by a group bacteria called...

    Text Solution

    |

  11. [A]: Due to excessive use of fertilizers, the available water to the p...

    Text Solution

    |

  12. [A]: Vernalization is also called as yarovization. [R]: In short day...

    Text Solution

    |

  13. [A]: Fundamental factor in the vernalization is low temperature. [R...

    Text Solution

    |

  14. [Aj: ABA plays an important role in plants during water stress and dro...

    Text Solution

    |

  15. (A]: Cytokinins help in retention of cholorophyll and delayed senescen...

    Text Solution

    |

  16. [A]: The germination of lettuce seeds is stimulated by red light and i...

    Text Solution

    |

  17. [A]: The far-red form of the phytochromes ab- sorb light at 740 nm. ...

    Text Solution

    |

  18. [A]: Elongation and division of cells are pro- moted by gibberellins. ...

    Text Solution

    |

  19. [A]: Senescence effect can be reversed by cytokinin. [R]: The loss ...

    Text Solution

    |

  20. [A]: Wilting occurs due to loss in turgidity. [R]: Turgor pressure c...

    Text Solution

    |