External protective tissues of plants (specifically in a dicot stem) are:

Which of the statements given below is not true about the formation of Annual Rings in trees?

The site of origin of lateral roots and the formation of cork cambium are features related to:

Trunks of some of the aged tree species appear to be composed of several fused trunks. Is it a physiological or anatomical abnormality? Explain in detail.

Secondary growth in the cortical region of a dicot stem occurs due to the activity of ..........

Statement-$1$: Heartwood is more durable and resistant to the attacks of microorganisms and insects compared to sapwood.
Statement-$2$: Heartwood contains organic compounds like oils,aromatic substances,gums,resins,tannins,and phenols.