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Fertilization & Mode of Entry of Pollen Tube in Ovule - Practice Questions & MCQ
Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET
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Fertilization & Mode of Entry of Pollen Tube in Ovule is considered one of the most asked concept.
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19 Questions around this concept.
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_____ usually feed on nectar and in some cases on pollen.
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In the diagram, which structure represents the endosperm?
Concepts Covered - 1
Fertilization & Mode of Entry of Pollen Tube in Ovule
- The fusion of male and female gametes is called fertilization.
- The pollination results in the landing of pollen grains on the stigma.
- The sequence of events that take place from landing to the fusion of gametes constitutes the fertilization.
- In angiosperms, the male gametes present in the pollen grain are brought to the female gamete present in the female gametophyte by a pollen tube. This is called the siphonogamy.
- The vegetative cell of the pollen grain germinates through one of the germ pores and the pollen tube grows within the style carrying the male gametes.
- The pollen tube grows through the tissues of the stigma and style and reaches the ovary.
- In some plants, pollen grains are shed at two-celled condition (a vegetative cell and a generative cell).
- In such plants, the generative cell divides and forms the two male gametes during the growth of the pollen tube in the stigma.
- In plants which shed pollen in the three-celled condition, pollen tubes carry the two male gametes from the beginning.
- The pollen tube enters the ovule through the following:
- Through the micropyle, called the porogamy, as seen in lily
- Through the chalaza, called the chalazogamy, as seen in Juglans
- Through the integuments or funicle, called the misogamy, as seen in cucurbits
- Pollen tube, after reaching the ovary, enters the ovule through the micropyle and then enters one of the synergids through the filiform apparatus.
- All these events–from pollen deposition on the stigma until pollen tubes enter the ovule–are together referred to as pollen-pistil interaction.
- Pollen-pistil interaction is a dynamic process involving pollen recognition followed by promotion or inhibition of the pollen.
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