Which of the following statements about secondary growth is TRUE? A) the steam a
ID: 83192 • Letter: W
Question
Which of the following statements about secondary growth is TRUE? A) the steam and roots of most dicots increase in girth B) it involves the cork cambium C) it involves the vascular cambium D) the secondary plant body does not include leaves E) all of the above statements are true This is the evaporative water loss experienced by plants via their stomata A) transpiration B) lignification C) guttation D) leaching E) root pressure The material that gives wood its characteristic strength and hardness is A) cuticle B) scleropollinen C) chitin D) lignin E) chlorophyllExplanation / Answer
Answer-5] The true statements about secondary growth are
E] all of the above statements are correct
explaination= A] The stems & roots of most dicots increases girth in size
B] it involves the cork cambium
The outer cortical layer & epidermis get broken due to the activity of vascular cambium ,therefore it is replaced by periderm
in the cortex ,certain cells regain the capacity to divide & cork -cambium gets formed
C] it involves the vascular cambium =secondary growth begins with the formation of a continuous cambium ring
the cambium present between the primary xylem & primary phloem of a vascular bundle is called as intrafascicular cambium
the cells of medullary rays adjoining these intrafascicular cambium strips becomes meristematic & forms the interfascicular cambium
Thus a complete & continuous ring of vascular cambium is formed
D] The secondary plant body does not include leaves
the leaves does not contains cork cambium & vascular cambium
therefore secondary growth is not seen
Answer 6] The evaporative water loss experienced by plants through their stomata is
A] transpiration
explaination= the root system absorbs large quantity of water from the soil
out of the total water about 98% of water is lost to the atmosphere through leaves of plant
it occurs through the stomata present in epidermis of leaves & young stem
stomata are minute pores in epidermis
INCORRECT OPTIONS ARE =
B] lignification = formation of lignin
C] Guttation= it is the phenomenon of removal of water in liquid phase through intact plant parts
D] leaching= loss of water soluble plant material through soil
E] root pressure= plants absorb water soil through osmosis
the continuous flow of water develops hydrostatic pressure in roots this pressure is known as root pressure
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