Animals & Nature
Trees & Forests Quiz
They communicate, share nutrients, and the oldest are 5,000 years old.
They communicate, share nutrients, and the oldest are 5,000 years old.
The Pando aspen clone in Utah is a single organism connected by one root system β covering 106 acres with 80,000 trees, estimated to be 80,000 years old. This quiz draws from a pool of 50 questions covering record-breaking trees, the Wood Wide Web, forest ecology, climate connections, remarkable adaptations, and surprising tree facts.
Each round presents 10 randomized questions from our pool of 50, making every attempt a unique experience. Select from four multiple-choice answers, receive instant feedback with in-depth explanations, and share your results to challenge others.
Questions span the oldest trees on Earth, the underground fungal networks that let trees communicate, how forests regulate climate, fire-dependent ecosystems, and remarkable adaptations like mangroves filtering salt and baobabs storing thousands of gallons of water. You might discover that Earth has lost 46% of its trees since humans began farming, or that forest bathing measurably lowers stress hormones.
The oldest known individual tree is Methuselah, a Great Basin bristlecone pine (Pinus longaeva) in the White Mountains of California, estimated to be over 4,855 years old. Its exact location is kept secret by the U.S. Forest Service to protect it. If clonal organisms count, the Pando aspen grove in Utah may be up to 80,000 years old, making it one of the oldest living organisms on Earth.
Yes. Trees communicate through underground mycorrhizal fungal networks β nicknamed the "Wood Wide Web" β and through airborne chemical signals. Research by ecologist Suzanne Simard showed that "mother trees" send carbon and nutrients to seedlings through these fungal networks, and can even identify and preferentially support their own offspring. Trees also release volatile chemicals when attacked by insects, warning neighboring trees to ramp up their defenses.
A mature tree absorbs roughly 48 pounds (22 kilograms) of carbon dioxide per year, though the exact amount varies widely depending on species, age, size, and growing conditions. Larger, faster-growing species in tropical climates absorb significantly more. Protecting existing mature forests is considered more effective for carbon capture than planting new trees, since young trees absorb far less CO2 than established ones.
Last updated: March 2026