How geitonogamy is considered as a kind of autogamy?

Geitonogamous flowering plants are genetically autogamous as the gametes come from the same parent plant but since the pollen grains are being transferred to a different flower which needs a pollinating agent, it is functionally an example of cross pollination.

Is autogamy and geitonogamy same?

is that geitonogamy is (botany) transfer of pollen grains from the anther of a flower to the stigma of another flower of the same plant while allogamy is (biology) the fertilization of an ovum from one individual with the spermatozoa of another; cross-fertilization.

Why is geitonogamy considered as self pollination?

Geitonogamy is functional self-pollination involving a pollinating agent, genetically similar to autogamy. Geitonogamy is a mode of pollination in which the pollen grains are transferred from the anther of one flower to the stigma of another flower of the same plant. It is a type of self-pollination.

How does Cleistogamy ensure autogamy?

(a) Cleistogamous flowers are those which do not open at all and pollen from other plants cannot land on the stigma of these flowers . Thus , in such plants cross pollination cannot occur and only autogamy occurs. Therefore , cleistogamy ensures autogamy .

Why geitonogamy is functionally cross pollination but genetically autogamy?

In Geitonogamous flowers the pollen grain comes from the same plant. It is being transferred to the stigma of another flower fo same plant. So it is functionally cross pollination by involving pollinating agent but genetically it is autogamy.

What is Tapetum mention its significance?

The tapetum is a specialised layer of nutritive cells found within the anther, of flowering plants, where it is located between the sporangenous tissue and the anther wall. Tapetum is important for the nutrition and development of pollen grains, as well as a source of precursors for the pollen coat.

Is geitonogamy a type of allogamy?

In the case of Allogamy flowers of two different plants participate in pollination. The flowers of the plants who undergo Geitonogamy need to be bisexual whereas that flowers of the plants taking part in Allogamy do not have a bisexual flower.

What is the difference between Autogamy and allogamy?

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.

How is geitonogamy different from autogamy and Xenogamy?

The main difference between autogamy geitonogamy and xenogamy is that autogamy occurs when the pollen grains from the anther of the flower are deposited on the stigma of the same flower, while geitonogamy occurs when the pollen grains from the anther of one flower are deposited on another flower of the same plant, and …

Why does cleistogamy always lead to autogamy?

Anther and stigma lie close to each other in the Cleistogamous flowers. Cleistogamous flowers are bisexual and cannot open even at maturity and hence self-pollination takes place. So, cleistogamous flowers are considered autogamous..

In which type of plant both autogamy and Geitonogamy are prevented?

Complete Answer: Autogamy and geitonogamy are prevented in the case of the dioecious plant where male and female gametes lie in different plants and need an external agent for pollination. Dioecious plants show cross-fertilization.

Which among this is genetically self-pollination but functionally cross pollination?

Geitonogamy
Geitonogamy is functionally cross pollination and genetically self pollination.