NEET-XII-Physics

Previous Year Paper year:2017

with Solutions -
Qstn# 136 Next-Qstn
  • #136
    Which of the statements given below is not
    true about formation of Annual Rings in trees?
    (1) Annual ring is a combination of spring
    wood and autumn wood produced in a year.
    (2) Differential activity of cambium causes
    light and dark bands of tissue early and
    late wood respectively.
    (3) Activity of cambium depends upon
    variation in climate.
    (4) Annual rings are not prominent in trees of
    temperate region.
    digAnsr:   4
    Ans : (4)
    Sol. Growth rings are formed by the seasonal
    activity of cambium. In plants of temperate
    regions, cambium is more active in spring and
    less active in autumn seasons. In temperate
    regions climatic conditions are not uniform
    throughout the year. However in tropics
    climatic conditions are uniform throughout
    the year.