NEET-XII-Physics
Previous Year Paper year:2017
Qstn# 136 Next-Qstn
- #136Which 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: 4Ans : (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.