Home
Class 12
BIOLOGY
Which is not a correct statements ? (A...

Which is not a correct statements ?
(A) Variations are the raw materials for evolution
(B) Variations provide genetic material for natural selection
(C) It helps the individual to adapt to changing environment
(D) Variations allow breeders to improve the crop field

A

A and D

B

B only

C

C and D

D

none of the above

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • CLASSICAL GENETICS

    FULL MARKS|Exercise Additional Questions (2- Mark Questios)|29 Videos

  • CLASSICAL GENETICS

    FULL MARKS|Exercise Additional Questions (3- Mark Questios)|8 Videos

  • CLASSICAL GENETICS

    FULL MARKS|Exercise Higher Order Thinking Skills (HOTs) Questions|5 Videos

  • CHROMOSOMAL BASIS OF INHERITANCE

    FULL MARKS|Exercise Higher Order Thinking Skills (HOTs) Questions|3 Videos

  • ECONOMICALLY USEFUL PLANTS AND ENTREPRENEURIAL BOTANY

    FULL MARKS|Exercise HIGHER ORDER THINKING SKILLS (HOTs) QUESTIONS|5 Videos

Similar Questions

Explore conceptually related problems

Assertion (A): Genetic variation provides the raw material for selection. Reason (R): Genetic variations are differences in genotypes of the individuals.

Assertion (A) : Genetic variation provides the raw material for selection. Reason (R) : Genetic variations are differences in genotypes of the individuals.

Assertion (A): Variations help the individuals to adapt themselves to the changing environment. Reason (R ) : It provides the genetic material for natural selection.

Discontinuous variation is also called quantitative inheritance. Continuous variation is also called qualitative inheritance. Variation is the raw material for evolution. Variation provides genetic material for natural selection.

a. The following are the important steps in plant breeding for developing a new plant variety. List them in the correct order: i. Seed multiplication ii. Release of a variety iii. Distribution iv. Evaluation v. Creation of genetic variation vi. Selection b. In spite of the proper application of fertilizers, irrigation and pest and disease control the yield, quality and disease and pest resistance of a self pollinated crop variety is decreasing generation after generation. Suggest a possible reason for this experience. Hint: The farmer is using seed collected from his own field for raising successive crops.

Answer the following questions a. Explain qualitatively on the basis of domain picture the irreversibility in the magnetisation curve of a ferromagnet. b. The hysteresis loop of soft iron piece has a much smaller area than that of a carbon steel piece. If the material is to go through repeated cycles of magnetisation , which piece will dissipate greater heat energy ? c. 'A system displaying a hysteresis loop such as a ferromagnet , is a device for storing memory ? ' Explain the meaning of this statement. d. What kind of ferromagnetic material is used for coating magnetic tapes in a cassette player , or for building ' memory stores ' in a modern computer ? e. A certain region of space is to be shielded from magnetic fields . Suggest a method.

Give reason a. Drosophila is the ideal material for genetic study. b. Haemophilia is more common in males. c. Aneuploidy leads to variation. d. Sex of the child is determined by father.

a. Name the experiment which establishes the wave nature of moving electrons. b. In that experiment, electrons are accelerated through a potential of 54 V and is made to fall normally on the nickel crystal of interatomic separation 0.91 A. Draw the polar graph showing the variation of intensity of the scattered electrons electrons and latitude angle at this potential. c. Calculate the d-Broglie wavelength of the electron.

FULL MARKS-CLASSICAL GENETICS -Additional Questions (1- Mark Questios)
  1. The term 'Genetics' was introduced by ...........

    Text Solution

    |

  2. Which is not a correct statements ? (A) Variations are the raw mater...

    Text Solution

    |

  3. The process of removal of anthers from the flower is called .............

    Text Solution

    |

  4. An allele is ...............

    Text Solution

    |

  5. Gregor Mendel ............. (i) was born in Czechoslovakia (ii) di...

    Text Solution

    |

  6. Match the following {:("Column I","Column II"),("(A) Cotyledon color...

    Text Solution

    |

  7. How many characters studied by Mendel in pisum sativum

    Text Solution

    |

  8. Mendel's work were rediscovered by ..............

    Text Solution

    |

  9. Crossing of F1 to any one the parent refers to ............

    Text Solution

    |

  10. Match the following {:("Gene interactions",F2 "Phenotype ratio"),("(...

    Text Solution

    |

  11. In an intergenic interaction , the gene that suppresses the pherotype ...

    Text Solution

    |

  12. Assertion (A) : Test cross is done between F2 hybrid with F1 recessive...

    Text Solution

    |

  13. Assertion (A) : Codominace is an example for intragenic interaction ...

    Text Solution

    |

  14. Assertion (A) : Pleiotropic gene affects multiple traits Reason (R )...

    Text Solution

    |

  15. Assertion (A) : Cytoplasmic male sterility is a Mendelian inheritance ...

    Text Solution

    |

  16. What is the phenotypic ratio in case of incomplete dominance

    Text Solution

    |

  17. Identify the mismatched pair

    Text Solution

    |

  18. Statement 1 : Intergenic gene interaction occurs between alleles at sa...

    Text Solution

    |

  19. Statement 1 : Test cross is done between F1 individual with homozygous...

    Text Solution

    |

  20. Identify the incorrect statement

    Text Solution

    |