Home
Class 12
BIOLOGY
[A]: The far-red form of the phytochrome...

[A]: The far-red form of the phytochromes ab- sorb light at 740 nm.
[R]: The red form of phytochrome absorbs light at 660 nm

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:
B
Promotional Banner

Topper's Solved these Questions

  • Plant Morphology & Reproduction

    TRUEMAN BIOLOGY|Exercise ASSERTION AND REASON|64 Videos

  • PRINCIPLES OF INHERITANCE AND VARIATIONS

    TRUEMAN BIOLOGY|Exercise MCQs|341 Videos

Similar Questions

Explore conceptually related problems

The wavelength of light absorbed by Pr form of phytochrome is

In a Young’s double slit experiment, 12 fringes are observed to be formed in a certain segment of the screen when light of wavelength 600 nm is used. If the wavelength of light is changed to 400 nm, number of fringes observed in the same segment of the screen is given by

A 100W sodium lamp radiates energy uniformly in all directions. The lamp is located at the centre of a large sphere that absorbs all the sodium light which is incident on it. The wavelength of the sodium light is 589 nm. (a) What is the energy per photon associated with the sodium light? (b) At what rate are the photons delivered to the sphere?

[A]: The germination of lettuce seeds is stimulated by red light and inhibited by infra- red light. [R]: Red light converts pr to active pfr form.

[A] : Light is the energy which is stored as chemical energy in the form of food during photosynthesis . [R] : Light also influence various other activities of organisms such as photoperiodism etc .

A parallel beam of white light falls on a convex lens. Images of blue, yellow and red light are formed on other side of the lens at a distance 20 cm, 20.5 cm and 21.4 cm respectively. The dispersive power of the material of the lens will be

Minimum light intensity that can be perceived by normal human eye is about 10^-10 W m^-2 . What is the minimum number of photons of wavelength 660 nm that must enter the pupil in one second, for one to see the object ? Area of cross-section of the pupil is 10^-4 m^2 ?

Good vision depends on adequate intake of carotene rich food Select the best option from the following statements (A) Vitamin A derivatives are formed from carotene (B) The photopigments are embedded in the membrane discs of the ineer segment ( C) Retinal is a derivative of Vitamin A (D) Retinal is a light absorbing part of all the visual photopigments

TRUEMAN BIOLOGY-Plant Physiology -ASSERTION AND REASON
  1. (A]: Cytokinins help in retention of cholorophyll and delayed senescen...

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  7. [A]: Plasmolysis is seen by both living and dead cells. [R]: Both ty...

    Text Solution

    |

  8. [A]: The water is absorbed by the root and moves into the stem. [R]...

    Text Solution

    |

  9. [A]: Sulphur stabilizes protein structure. [R]: It does not partici...

    Text Solution

    |

  10. [A]: Stomata remain open during day [R]: Stomata help in gaseous exc...

    Text Solution

    |

  11. [A]: The nitrogen content of the plant cannot be detected accurately b...

    Text Solution

    |

  12. [A]: Submerged plants, get CO2 in-the form of CO3^(-) & HCO3^(-3) [R...

    Text Solution

    |

  13. [A]: The evolution of molecular oxygen is concerned with photosystem-1...

    Text Solution

    |

  14. [A]: Antitranspirants are material applied to plants for retarding tra...

    Text Solution

    |

  15. Assertion. Calcium deficiency symptoms first appear in the apical regi...

    Text Solution

    |

  16. Assertion: Deficiency of sulpur causes chlorosis in plants Reason : ...

    Text Solution

    |

  17. Assertion : Water and mineral uptake by root hairs from the soil occur...

    Text Solution

    |

  18. [A]: Stomata open when guard cells have more H^+ . [R]: Increased K^+...

    Text Solution

    |

  19. [A]: In washed beet root cylinders, betacyanin pigment does not come o...

    Text Solution

    |

  20. [A]: The rate of transpiration is indirectly proportional to RH. [R]...

    Text Solution

    |