2019-03-01 Biology Times

(singke) #1
Biology Times March 19

                        a.  Secondary   meristem                        b.  Apical  meristem
c. Intercalary meristem d. Primary meristem

  1. Growth rings are formed by the activity of
    a. Cambium b. Xylem
    c. Phloem d. Both xylem and phloem

  2. Dendrochronology is the study of
    a. Height of a tree
    b. Diameter of a tree
    c. Age of tree by counting number of annual

    rings in the main stem
    d. All of these

  3. Lenticel develops through the activity of
    a. Vascular cambium b. Dermatogen
    c. Phellogen d. Intercalary meristem

  4. In old dicot stems, a major part of the wood is
    filled up with tannin, resins, gums etc, This part

    of wood is called
    a. Sap wood b. Heart wood
    c. Soft wood d. Hard wood

  5. The collective name for cork cambium and
    phelloderm is
    a. Phellogen b. Periderm
    c. Endoderm d. Secondary tissue

  6. The ballon shaped structures called tyloses
    a. Originate in the lumen of vessels
    b. Characterize the sap wood
    c. Are extensions of xylem parenchyma cells

    into vessels
    d. Are linked to the ascent of sap through xylem


  7. In an annual ring, the light coloured part is known
    a. Heart wood b. Late wood
    c. Early wood d. Sap wood

  8. Lenticels are involved in
    a. Transpiration b. Gaseous exchange
    c. Photosynthesis d. Translocation

  9. Abnormal secondary growth occurs in

    a. Dracaena b. Ginger
    c. Barley d. Coconut

  10. Which exposed wood will decay faster
    a. Sap wood b. Heart wood
    c. Soft wood d. Hard wood

  11. Find out the correct order of the components with
    reference to their arrangement from the outer side
    to inner side in a woody dicot stem
    i. Secondary cortex ii. Wood
    iii. Secondary phloem iv. Phellum
    a. iv, i, iii, ii b. iv, iii, ii, i
    c. iv, iii, i, ii d. i, ii, iv, iii

18.Consider following statements regarding sap
i. Tannins, resins are deposited in tracheary
ii. It is not durable
iii. Sapwood represents central wood of the plants
iv. It consists of living cells
Select the correct option
a. i, iii b. i, iv c. i, ii d. iv, iii

  1. Consider the statements on secondary growth;
    i. Secondary growth is of two types viz., Normal
    and Anamolous
    ii. Any secondary growth brought about by a

    fascicular cambium is called normal
    iii. Any secondary growth brought about by a

    extra-fascicular cambium is called Anamolous
    iv. Both intra and inter fascicular cambium join
    together to form a heart wood
    Select the correct option
    a. i, iii b. i, iii c. iii, iv d. i, iv

  2. Consider the statements on Annual rings;
    i. The vessel of heartwood are filled up by

    tannins, gums and resin
    ii. The vessel of sap wood are non functional
    iii. Heart wood is light coloured
    iv. Sap wood helps in conduction of water and
    mineral salts
    Select the correct option
    a. i, ii b. ii, iii c. iii, iv d. All of the above

  3. a 2. a 3. b 4. c 5. c

  4. a 7. a 8. c 9. c 10. b

  5. b 12. c 13. d 14. b 15. a

  6. a 17. a 18. a 19. c 20.a

  7. Plants having little or no secondary growth are
    (NEET 2018)
    a. Conifers b. Deciduous angiosperms
    c. Grasses d. Cycas

  8. Secondary xylem & phloem in dicot stem are
    produced by (NEET 2018)
    a. Phellogen b. Vascular cambium
    c. Apical meristem d.Axillary meristem

  9. The vascular cambium normally gives rise to

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