Study Material Page 7 of 24 | Reproductive Biology of Angiosperms | CUET (Common University Entrance Test) PG Botany (SCQP07) | Covers Complete Syllabus
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Difference between Self-Pollination and Cross Pollination:
| Sr. No | Self-pollination | Cross pollination |
| 1 | Pollen grains are transferred to stigma of same or genetically similar flower. | Pollen grains are transferred to stigma of genetically different flower. |
| 2 | Anthers and stigma mature simultaneously. | They mature at different time, i.e.. protandry and protogyny. |
| 3 | It occurs in open as well as closed flower. | It occurs on only open flower. |
… (158 more words, 14 figures) …
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Difference between Embryo and Endosperm
| Sr. No | Embryo | Endosperm |
| 1 | It is formed by fertilized egg (syngamy). | It is formed by fusion of secondary nucleus (triple fusion). |
| 2 | It is always diploid structure. | It is generally triploid structure. |
| 3 | It gives rise to new plant. | It provides nutrition to the developing embryo. |
| 4 | Cotyledons, plumule and radicle are formed in embryo. | Such types of structures are never formed. It is only found in endospermic seeds. |
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Difference between Egg Cell and Secondary Nucleus
| Sr. No | Egg cell | Secondary nucleus |
| 1 | It is present near the micropyle, inside the embryosac. | It is present in the middle of the embryosac. |
| 2 | Generally egg is surrounded by two synergids. | It is not surrounded. |
| 3 | Only single nucleus is present in it. | It is formed by fusion of two polar nuclei. |
| 4 | It is haploid structure. | It is diploid structure. |
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Difference between Male and Female Gametophyte
| Sr. No | Male Gametophyte | Female Gametophyte |
| 1 | It is developed from microscope or pollen grain. | It is developed from megaspore. |
| 2 | It does not remain embedded permanently in microsporangium. | It remains embedded permanently. |
| 3 | Male gametes come out of pollen grain due to the formation of pollen tube. | Female gamete always remains inside, covered by membrane of megasporangium. |
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Difference between Pollination and Fertilization
| Sr. No | Pollination | Fertilization |
| 1 | Transfer of pollen grains from anther to stigma of the flower is called pollination. | Fusion of male gametes and egg cell in embryosac situated inside the ovule is called fertilization. |
| 2 | This process takes place before fertilization. | This process takes place after pollination. |
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Pollination
- Pollination is defined as the process of transfer of pollen grains from anther to the stigma of the same flower or of different flower of the same species.
- Pollination is of different types:-
- Self-pollination or Autogamy: If the pollen grains are transferred from an anther to the stigma of the same flower is called self-pollination or autogamy.
- Self-pollination is a form of pollination which can occur when a flower has both the male and the female gametes, that…
… (134 more words, 9 figures) …
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