15573.Identify the correct order of the components with reference to their arrangement from outer side to inner side in a woody dicot stem.
I. Secondary cortex
II. Autumn wood
III. Secondary phloem
IV. Phellem
The correct order is:
II, III, I, IV
III, IV, II, I
IV, I, III, II
I, II, IV, III
15575.Which of the following plant produces both offsets and bulbils?
Chrysanthemum
Oxalis
Agave
Bryophyllum
15578.Age of a tree can be estimated by
Its height and girth
Biomass
Number of annual rings
Diameter of its heartwood
15579.For a critical study of secondary growth in plants, which one of the following pairs is suitable?
Wheat and maiden hair fern
Sugarcane and sunflower
Teak and pine
Deodar and fern
15580.Heartwood differs from sapwood in
Absence of vessels and parenchyma
Presence of rays and fibres
Being susceptible to pests and pathogens
Having dead and non-conducting elements
15581.The inner, darker and harder portion of secondary xylem that can not conduct water, in an older dicot stem, is called
Bast
Alburnum
Duramen
Wood
15582.Companion cells are closely associated with
Trichomes
Guard cells
Sieve elements
Vessel elements