NEET BIOLOGY

Detailed explanation-1: -By counting the annual growth rings, we can calculate the age of the tree. So, if the cross-section of a trunk of the tree shows about 50 annual rings, then the age of the tree will be 50 years. As the rings are annual information at the end of 100 years, the annual rings will be equal to 100.

Detailed explanation-2: -In dicot roots the cambium is uneven in the beginning and wavy. However, the cambium ring pushes the phloem out and secondary xylem inside to form a proper ring like structure. In dicot stems, the intra and inter fascicular cambium merge together to form the cambium ring.

Detailed explanation-3: -These rings can tell us how old the tree is, and what the weather was like during each year of the tree’s life. The light-colored rings represent wood that grew in the spring and early summer, while the dark rings represent wood that grew in the late summer and fall.

Detailed explanation-4: -quantities of xylem and phloem. seasonal variations in the vascular cambium activity. seasonal variations in the activity of cork cambium.