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For a critical study of secondary growth in plants, which one of the following pairs is suitable?
A
teak and pine
B
deodar and fern
C
wheat and maiden hair fern
D
sugarcane and sunflower
Detailed Solution
Secondary growth is the increase in girth of the stem and root due to the activity of the lateral meristems, the vascular cambium and the cork cambium.
It occurs in dicotyledons and gymnosperms.
Teak is a dicot tree and pine is a gymnosperm; both have well-developed lateral meristems and show extensive secondary growth, forming wood with annual rings. So this pair is suitable.
Ferns (including the maiden hair fern, Adiantum) are pteridophytes and do not show secondary growth, so the pairs containing a fern are not suitable.
Wheat and sugarcane are monocots, which lack vascular cambium and normally do not show secondary growth.
Sunflower is an annual dicot with only limited secondary growth, and it is paired with sugarcane, a monocot.
So the suitable pair is teak and pine.
It occurs in dicotyledons and gymnosperms.
Teak is a dicot tree and pine is a gymnosperm; both have well-developed lateral meristems and show extensive secondary growth, forming wood with annual rings. So this pair is suitable.
Ferns (including the maiden hair fern, Adiantum) are pteridophytes and do not show secondary growth, so the pairs containing a fern are not suitable.
Wheat and sugarcane are monocots, which lack vascular cambium and normally do not show secondary growth.
Sunflower is an annual dicot with only limited secondary growth, and it is paired with sugarcane, a monocot.
So the suitable pair is teak and pine.