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10th Standard Science - Heredity Model Question Paper Oct-31 , 2019

Heredity 

10th Standard Science - Heredity Model Question Paper

Heredity Model Question Paper

10th Standard

    Reg.No. :
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Science

Time : 02:30:00 Hrs
Total Marks : 60
    8 x 1 = 8

  1. 9 : 3 : 3 : 1 ratio is due to

    (a)

    Segregation

    (b)

    Crossing over

    (c)

    Independent assortment

    (d)

    Recessiveness

  2. The region of the chromosome where the spindle fibres get attached during cell division

    (a)

    Chromomere

    (b)

    Centrosome

    (c)

    Centromere

    (d)

    Chromonema

  3. The centromere is found at the centre of the ________________ chromosome

    (a)

    Telocentric

    (b)

    Metacentric

    (c)

    Sub-metacentric

    (d)

    Acrocentric

  4. The _____________ units form the backbone of the DNA.

    (a)

    5 Carbon sugar

    (b)

    Phosphate

    (c)

    Nitrogenous bases

    (d)

    Sugar phosphate

  5. Okasaki fragments are joined together by ___________________.

    (a)

    Helicase

    (b)

    DNA polymerase

    (c)

    RNA primer

    (d)

    DNA ligase

  6. The haploid condition in a human cell refers to________ chromosomes

    (a)

    44

    (b)

    23

    (c)

    46

    (d)

    22

  7. L shaped chromosomes are described as_______

    (a)

    acrocentric

    (b)

    metacentric

    (c)

    submetacentric

    (d)

    telocentric

  8. ________is a gene mutation

    (a)

    Deletion

    (b)

    Duplication

    (c)

    Translocation

    (d)

    Ploidy

    9. 5 x 1 = 5

  9. The thin thread like structures found in the nucleus of each cell are called _________.

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    Chromosomes

  10. DNA consists of two ____________ chains.

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    polynucleotide

  11. An inheritable change in the amount or the structure of a gene or a chromosome is called _______________.

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    mutation

  12. The number of chromosomes present in a human cell is_________

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    46

  13. __________stated base pair rule.

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    Chargaff

    14. 5 x 1 = 5

  14. Allosome

    15. (1)

    Basic principles of Heredity

  15. Dihybrid ratio

    16. (2)

    Replication site

  16. Mendel

    17. (3)

    Replication fork

  17. Topo isomerase

    18. (4)

    9:3:3:1

  18. Helicase

    19. (5)

    23rd pair of chromosomes
    2 x 2 = 4

  19. Define a gene

  20. Mention the types of gene or point mutation

    21. 4 x 2 = 8

  21. What is nucleolar organizer?

  22. Write a note on euploidy.

  23. State the Law of Independent Assortment

  24. Differentiate diploid and haploid condition.

    25. 4 x 4 = 16

  25. Why did Mendel select pea plant for his experiments?

  26. What are allosomes?

  27. Explain the structure of a chromosome

  28. Write a note on mutation.

    29. 2 x 7 = 14

  29. Explain with an example the inheritance of dihybrid cross. How is it different from monohybrid cross?

  30. How is the structure of DNA organised? What is the biological significance of DNA?

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