DENDROLOGY

Detailed explanation-1: -The largest group of gymnosperms are conifers, which comprise giant trees that can reach up to the height of 110 meters. They are the largest group due to the presence of six-hundred and thirty species of the total eight-hundred and sixty species of gymnosperms found on the planet.

Detailed explanation-2: -The largest group of living gymnosperms are the conifers (pines, cypresses and relatives) and the smallest is ginkgo, a single living plant species found in China.

Detailed explanation-3: -This primitive ancestral condition of large seeds is reflected in certain gymnosperms (Cycas circinalis, 5.5 × 4 cm [2.2 × 1.6 inches]; Araucaria bidwillii, 4.5 × 3.5 cm [1.8 × 1.4 inches]) and also in some tropical rainforest trees with nondormant water-rich seeds (Mora excelsa, 12 × 7 cm [4.7 × 2.8 inches]).

Detailed explanation-4: -Zamia pygmaea is the smallest gymnosperm, and Sequoia sempervirens is the highest.