Question

In Pinus, male and female cones occur
A. On the same branch
B. On different branches of same plant
C. On different plants
D. On the trunk

Answer 1

Pines are mainly monoecious, with male and female cones in the same tree, although a couple of separate species are sub-dioecious.

Complete answer:
In the Pinus genus of the Pinaceae family, a pine is a conifer. In the subfamily of Pinaceae Pinus is the only species. Pine can also be referred to as pine wood. Pine wood is one of the most commonly used wood varieties used as lumber. Pine trees grow evergreen, with the majority of the species reaching 15-45 meters, tall coniferous resinous trees growing 3-80 meters. The highest is an 81.79 m tall ponderosa pine found in South Oregon's Rogue River-Siskiyou National Forest and the smallest of these are Siberian dwarf pines and Potosi Pinyon.

Pines are mainly monoecious, with male and female cones in the same tree, although a couple of separate species are sub-dioecious. The male cones are small, usually 1-5 cm in length, and they only occur for a short time when they drop pollen. The female cones are matured for 1.5-3 years after pollination, depending on species, with real fertilisation delayed for one year. The female cones have a maturity of 3-60 cm. Pinus reproductive structures for both males and females exist on various branches of a single plant. The female cones are typically larger on a pine tree. They are situated at the top of the tree branches. The male cones on the lower branches are smaller.

Thus, the correct answer is option B. i.e., On different branches of the same plant.

Note: In Pinus, the male and female reproductive structures occur in various branches of the same plant. The female cones are typically larger on a pine tree. They are situated at the top of the tree branches. The male cones on the lower branches are smaller. Therefore, the Pinus is a monoceious plant. As the pine trees are deciduous and every autumn they shed pollen, cones and leaves, they are repeated in spring again.