HORTICULTURE

Detailed explanation-1: -The oldest part of the tree is always on the inside. The sapwood is the pipeline that carries water and nutrients from the roots up to the leaves. As new layers develop, the inner layers die and become heartwood. Heartwood is dead wood in the centre of the tree.

Detailed explanation-2: -The Great Basin Bristlecone Pine (Pinus longaeva) has been deemed the oldest tree in existence, reaching an age of over 5, 000 years old. The bristlecone pine’s success in living a long life can be attributed to the harsh conditions it lives in.

Detailed explanation-3: -"Pinus Longaeva” or bristlecone pines are the oldest trees, having been alive for nearly 5000 years.

Detailed explanation-4: -A tree is a connected subgraph of a connected graph containing all the nodes of the graph but containing no loops, i.e., there is a unique path between every pair of nodes. The number of closed paths in a tree of the graph is zero. Therefore is not true for tree and graph.