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11th Standard Biology Important Question Paper Periyar Matric Higher Secondary School Oct-24 , 2018

OCT-23.10.2018

11th Standard Biology Important Question Paper

OCT-23.10.2018

11th Standard

    Reg.No. :
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Biology

Time : 00:01:00 Hrs
Total Marks : 35

    Multiple Choice Question

    8 x 1 = 8

  1. Read the following sentences and identify the correctly matched sentences.
    i. In exarch condition, the protoxylem lies outside of metaxylem.
    ii. In endarch condition, the protoxylem lie towards the centre.
    iii. In centarch condition, metaxylem lies in the middle of the protoxylem.
    iv. In mesarch condition, protoxylem lies in the middle of the metaxylem.

    (a)

    i, ii and iii only

    (b)

    ii, iii and iv only

    (c)

    i, ii and iv only

    (d)

    All of these

  2. When a leaf trace extends from a vascular bundle in a dicot stem, what would be the arrangement of vascular tissues in the veins of the leaf?

    (a)

    Xylem would be on top and the phloem on the bottom

    (b)

    Phloem would be on top and the xylem on the bottom

    (c)

    Xylem would encircle the phloem

    (d)

    Phloem would encircle the xylem

  3. The common bottle cork is a product of______.

    (a)

    Phellem

    (b)

    Phellogen

    (c)

    Xylem

    (d)

    Vascular cambium

  4. What is the fate of primary xylem in a dicot stem showing extensive secondary growth?

    (a)

    It is retained in the centre of the axis

    (b)

    It gets crushed

    (c)

    May or may not get crushed

    (d)

    It gets surrounded by primary phloem

  5. In a fully turgid cell _____.

    (a)

    DPD = 10 atm; OP = 5 atm; TP = 10 atm

    (b)

    DPD = 0 atm; OP = 10 atm; TP = 10 atm

    (c)

    DPD = 0 atm; OP = 5 atm; TP = 10 atm

    (d)

    DPD = 20 atm; OP = 20 atm; TP = 10 atm

  6. Which among the following is correct?
    i. Apoplast is fastest and operate in nonliving part. 
    ii. Transmembrane route includes vacuole.
    iii. Symplast interconnect the nearby cell through plasmadesmata.
    iv. Symplast and transmembrane route are in living part of the cell

    (a)

    i and ii

    (b)

    ii and iii

    (c)

    iii and iv

    (d)

    i, ii, iii, iv

  7. Identify correct match.

    1. Die back disease of citrus (i) Mo
    2. Whip tail disease (ii) Zn
    3. Brown heart of turnip (iii) Cu
    4. Little leaf (iv) B
    (a)

    1(iii) 2 (ii) 3 (iv) 4 (i)

    (b)

    1 (iii) 2 (i) 3 (iv) 4 (ii)

    (c)

    1 (i) 2 (iii) 3 (ii) 4 (iv)

    (d)

    1 (iii) 2 (iv) 3 (ii) 4 (i)

  8. Match the correct combination.

      Minerals   Role
    A Molybdenum 1 Chlorophyll
    B Zinc 2 Methionine
    C Magnesium 3 Auxin
    D Sulphur 4 Nitrogenase
    (a)
    A B C D
    1 3 4 2
    (b)
    A B C D
    2 1 3 4
    (c)
    A B C D
    4 3 1 2
    (d)
    A B C D
    4 2 1 3

    9. Any Four Question

    4 x 2 = 8

  9. Why the cells of sclerenchyma and tracheids become dead?

  10. Explain sclereids with their types.

  11. In a forest, if the bark of a tree is damaged by the horn of a deer, How will the plant overcome the damage?

  12. In which season the vessels of angiosperms are larger in size, why?

  13. If the concentration of salt in the soil is too high and the plants may wilt even if the field is thoroughly irrigated. Explain

  14. The nitrogen is present in the atmosphere in huge amount but higher plants fail to utilize it. Why?

    15. Any Three Questions

    3 x 3 = 9

  15. What are Sieve tubes ? Explain.

  16. Continuous state of dividing tissue is called meristem. In connection to this, what is the role of lateral meristem?

  17. How phosphorylase enzyme open the stomata in starch sugar interconversion theory?

  18. List out the non-photosynthetic parts of a plant that need a supply of sucrose?

  19. Plant A in a nutrient medium shows whiptail disease. Plant B in a nutrient medium shows a little leaf disease. Identify mineral deficiency of plant A and B?

    20. Any Two Questions

    2 x 5 = 10

  20. Distinguish the anatomy of dicot root from monocot root.

  21. A timber merchant bought 2 logs of wood from a forest & named them A & B, The log A was 50 year old & B was 20 years old. Which log of wood will last longer for the merchant? Why?

  22. What are the parameters which control water potential?

  23. Write the role of nitrogenase enzyme in nitrogen fixation? 

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