Allogamy generally refers to the fertilization of an ovum of an organism with the spermatozoa of another, usually of the same species. Autogamy, in contrast, is a self-fertilization, e.g. fertilization occurring on a flower when the ovum is fertilized with its own pollen (as in self-pollination).
Is Allogamy and Xenogamy the same?
Allogamy and Xenogamy are types of cross-fertilisation. Allogamy refers to the transfer of pollen grains from the anther to the stigma of another flower of the same or different plant of the same species, whereas xenogamy refers to the transfer of pollen grains from the anther to the stigma of a different plant.
What does Allogamous?
: reproducing by cross-fertilization.
What is another term for Allogamy?
Allogamy Synonyms – WordHippo Thesaurus. What is another word for allogamy?
What is allogamy example?
Transfer of pollen grains from the anther of one plant to the stigma of another plant is called allogamy or cross pollination. This is the common form of out-breeding. II. Allogamy.
|Mode of pollination and reproduction||Examples of crop plants|
|C. Often Allogamous Species||Sorghum, Cotton, Triticale, Pigeonpea, Tobacco.|
Why is complete autogamy rare?
Complete autogamy is rare when anther and stigma are exposed, e.g. in chasmogamous flowers. For autogamy to occur, stigma and anther should be in close proximity and require synchronisation between stigma receptivity and pollen release. Some amount of cross-pollination naturally occurs.
Which of these is not essential for allogamy?
Self sterility i.e., ability of a bisexual flower to form viable off springs. Self fertilization, is necessary for allogamy.
How does Xenogamy occur?
Xenogamy (Greek xenos=stranger, gamos=marriage) is the transfer of pollen grains from the anther to the stigma of a different plant. This is the only type of cross pollination which during pollination brings genetically different types of pollen grains to the stigma.
What is meant by Mesogamy?
Answer: Mesogamy is a type of fertilization observed in all Cucurbit plants, such as pumpkin, ridge gourds, bitter gourd and other gourd plants. In this type of fertilization, the pollen tube enters the ovule through its middle part or through the integuments of the ovule.
Is Allogamy and Autogamy same?
The key difference between Allogamy and Autogamy is that Allogamy is the fusion of male and female gametes that come from two different individuals while Autogamy is the fusion of male and female gametes of the same individual. Furthermore, fertilization can be two types; self-fertilization or cross-fertilization.
What is deferent Allogamy Autogamy?
Autogamy refers to the self-pollination between the anther and stigma of the same flower, whereas allogamy refers to cross-pollination. In allogamy, the transfer of pollen occurs from the anther of one flower to the stigma of another flower of the same or another plant.
What does the term self pollination mean?
: the transfer of pollen from the anther of a flower to the stigma of the same flower or sometimes to that of a genetically identical flower (as of the same plant or clone)
What is Dichogamy plant?
Dichogamy is a temporal flowering system in which male and female reproductive organs mature at different times within a single flower or across multiple flowers. When the female reproductive organ (or female flower) matures first, it is called protogyny.
What is the example of Herkogamy?
usually single flowers as in many Papaveraceae and Rosaceae. Muntingia calabura (Elaeocarpaceae) is another example of a dish blossom with unordered herkogamy; the many stamens surrounding a large, central, lobed stigma (Bawa & Webb 1983). In New Zealand, Corokia cotoneaster provides an example of this type of flower.
What is triple fusion?
: the fusion involving two polar nuclei and a sperm nucleus that occurs in double fertilization in a seed plant and results in the formation of the endosperm.
Is vallisneria Anemophilous?
When wind is an agent of pollination the process is called ‘anemophily’. Vallisneria and coconut are mostly pollinated by water and datura is pollinated by insects. Grass is the only plant to be pollinated by the wind. Hence anemophily occurs only in grass.
What are the two conditions required for autogamy?
The conditions required for the autogamy are bisexuality, synchrony in pollen release and stigma receptivity and anther and stigma should lie close to each other.
Is Chasmogamy an autogamy?
Chasmogamy is of two types i.e., self-pollination (autogamy) and cross-pollination. Cross-pollination is of two types i.e., geitonogamy and xenogamy. Thus, these flowers are invariably autogamous as there is no chance of cross-pollen landing on the stigma.