2019-03-01 Biology Times

(singke) #1

Biology Times (^19)
(NEET 2017)
a. Phelloderm b. Primary phloem
c. Secondary xylem d. Periderm

  1. Read the different components from (i) to (iv) in
    the list given below and tell the correct order of the
    components with reference to their arrangement
    from outer side to inner side in a woody dicot
    stem (AIPMT 2015)
    i. Secondary cortex ii. Wood
    iii. Secondary phloem iv. Phellum
    a. iv, i, iii, ii b. iv, iii, i, ii
    c. iii, iv, ii, i d. i, ii, iii, iv

  2. Inter fasicular cambium develops from the cells of
    (NEET 2013)
    a. Endodermis b. Pericycle
    c. Medullary rays d. Xylem parenchyma

  3. Age of a tree can be estimated by
    (NEET 2013)
    a. No. of annual ring

    b. Diameter of its heart wood
    c. Its height and girth
    d. Biomass

  4. Heart wood differs from sapwood in
    (AIPMT 2010)
    a. Presence of rays and fibers

b.   Absence    of  vessels and parenchyma
c. Having dead and non-functional element
d. Being susceptible to pests and pathogens

  1. The annular and spirally thickened conducting
    elements generally develop in the protoxylem
    when the root or stem is (AIPMT 2009)
    a. Elongating b. Widening
    c. Differentiating d. Maturing

  2. For a critical study of secondary growth in plants.
    Which of the following pairs is suitable?
    (AIPMT 2009)
    a. Teak & Pine
    b. Deodar & Fern
    c. Wheat & Maiden hairfern
    d. Sunflower & Sunflower

  3. Heartwood is (AIPMT 2006)
    a. Outerpart of secondary xylem
    b. Outerpart of secondary phloem
    c. Innerpart of secondary xylem
    d. Innerpart of secondary phloem

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

  5. a 7. c 8. c 9. a 10. c

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