Question

Female cone of pinus develops seeds in
a. One year
b. Two year
c. Three year
d. Four years

Answer 1

The pinus is commonly called a pinus. These are gymnosperms, non-flowering plants that exposed seeds not enclosed in an ovary. They can bear both the sexes on the same tree and gametes are present in a structure called a strobilus. Female pine is present in the upper branches. Cones remain close for many years and hence pollination and fertilization takes place in several years.

Complete answer:
The megastrobilus is also called a female pine cone. It produces the ovule, or unfertilized seed. The scales are present on the female cone that open to receive pollen and close when pollen gets trapped. Fertilization takes place after this. The female pine develops over two to three years after fertilization. In some of the species, the cones open at maturity and the seeds are released. The cones remain closed in some of the species for several species until opened by rotting,or by food seeking animals. In some species of the pine, the scales bearing nuts like seed may be expanded to form a wing for airborne dispersal.

The seeds and pine nuts can be produced from some of the pine trees. They are popular in human cuisine. Some of the nuts are technically fruits; the flowering plants do not form the pine nuts.

Pine trees have woody stems covered in bark, which protects tissues that conduct nutrients and water. Pine trees also provide materials like lumber, turpentine, rosin, paper, and fuel.

The pollination and development of seeds takes place between 18-24 months.
Hence, the correct answer is option (B).

Note: In the western United States, Native Americans use pines as the important food source. In Italy, stone pine is still used as food. Pine trees are found worldwide primarily in the north temperate regions. The largest family of the conifers, consisting of about 262 species, and includes fir, larch, spruce, hemlock, and cedar are classified into Pinaceae.