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Identify the correct statements:
A. Lenticels are the lens-shaped openings permitting the exchange of gases.
B. Bark formed early in the season is called hard bark.
C. Bark is a technical term that refers to all tissues exterior to vascular cambium.
D. Bark refers to periderm and secondary phloem.
E. Phellogen is single-layered in thickness.
Choose the correct answer from the options given below:
A
B and C only
B
B, C and E only
C
A and D only
D
A, B and D only
Explanation
Lenticels permit gas exchange and bark includes periderm and secondary phloem.
Detailed Solution
Bark is a non-technical term that refers to all tissues exterior to the vascular cambium, therefore including secondary phloem. Bark refers to a number of tissue types, viz., periderm and secondary phloem. Bark that is formed early in the season is called early or soft bark. Towards the end of the season, late or hard bark is formed. Lenticels permit the exchange of gases between the outer atmosphere and the internal tissue of the stem. Meristematic tissue called cork cambium or phellogen develops, usually in the cortex region. Phellogen is a couple of layers thick.