Question

Explain life cycle of Pinus.

Answer 1

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The female and male inflorescence of the pine tree develop as cones on the sporophyte. The female cones (female strobili, singular strobilus) consist of megasporophylls that carry uncovered (Gymno = naked / exposed, hence Gymnosperms) ovules. Inside the ovule the megasporocyte undergoes meiosis, producing four haploid cells. One of these cells survive as a megaspore. The megaspore goes through mitotic divisions and forms a small female gametophyte, in which two or three archegonia are present, each with one egg cell. 

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Answer 2

The life cycle of Pinus is:

• Pinus is a gymnosperm plant. Sexual reproduction takes place in the pinus plants.

• Male and female cones are developed on different branches of the same tree.

• Female cones consist of megasporophylls that carry uncovered ovules.

• The male cone consists of microsporophylls that contains two microsporangia.

• Megasporophylls undergoes meiosis forms four haploid cells. These cells are considered as megaspores.

• Microsporophylls formed into pollen grains after undergoing mitotic division.

• After that pollen grains are released into the atmosphere and dispersed by the wind.

• The mega sporophyte contains two or three archegonium cells. Pollen tubes contain sperm cells.

• Both are fused together to form an embryo. This embryo develops into mature seeds after several years.