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| 1. |
Each pollen grain produces tow male gametes. How many pollen grains will be required to fertilise 4 ovules present in a particular carpel ? Give reasons in support of your answer. |
| Answer» Every pollen grain germinates to produce two male gametes. These are carried to the embryo sac through a pollen tube. The pollen tube enters into the embryosac through the filliform apparatus of one of the synergids and releases two male gametes. Out of two male gametes , one fuses with the egg and the other fuses with the secondary nucleus. Therefore, one pollen grain can fertilise only one ovule and four pollen grain will be required to fertilise four ovules. | |