Study the given statements about gymnosperms and select the correct op...
Explanation:
The correct option is (d) Statement (i), (ii), and (iii) are correct.
Statement (i): Mode of fertilization is siphonogamy.
Siphonogamy is the mode of fertilization in gymnosperms. It involves the transfer of male gametes (sperm) to the female gametophyte through a pollen tube. This process occurs after pollination, when pollen grains are transferred from the male cone to the female cone.
Statement (ii): Male and female cones are borne on the same tree in Pinus.
This statement is correct. In Pinus (a type of gymnosperm), the male and female cones are borne on the same tree, but on different branches. The male cone is smaller and produces pollen grains, while the female cone is larger and contains ovules.
Statement (iii): Endosperm represents the female gametophyte.
This statement is correct. In gymnosperms, including Pinus, the female gametophyte is represented by the endosperm. The endosperm is a nutritive tissue that surrounds and nourishes the developing embryo. It is formed as a result of the fusion of the male gamete (sperm) with the two polar nuclei of the female gametophyte.
Therefore, all the given statements are correct.