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 Dichogamy and example?
Answer: Dichogamy is a condition in which the pistil and stamen of the same flower mature at different periods. Examples – Maize, Sugarbeet, Pearl millet. Explanation: Dichogamy is a natural method of preventing self pollination.
What is Dichogamy Ncert 12?
(ii) Dichogamy : In bisexual flowers, when two sexes mature at different intervals and thus avoid self pollination is known as dichogamy. When stamens mature earlier than the stigma, it is known as protandry and the flowers are called protandrous e.g., Coriander, Jasmine, Sunflower, Lady’s finger, etc.
What is Dichogamy explain the two types of Dichogamy?
Solution : Dichogomy is of two types:
(a) Protogyny: If the carpel attains the maturity earlier than anther, this condition is known as protogyny. For example, peepal, custard, etc.
(b) Protandry: If the anther matures earlier than stigma, this condition is known as protandry.
What is Dichogamy Ncert?
Dichogamy is the phenomenon of the maturation of female reproductive structures of the plant in a different period to the maturation of the male reproductive structures.
What is Dichogamy Shaalaa 12?
Dichogamy: In this, anthers and stigmas mature at different times in a bisexual flower due to which self-pollination is prevented.
What is the Dichogamy answer in one sentence?
Dichogamy is the process of maturation of the anthers and the stigma of a flower.
What is the difference between herkogamy and Dichogamy?
The key difference between dichogamy and herkogamy is that dichogamy refers to sequential hermaphroditism, while herkogamy refers to the interference between male and female functions in plants. Dichogamy and herkogamy are two phenomena that depict adaptations shown by plants for sexual reproduction.
What is Monoecy biology?
monoecy (uncountable) (biology) The state of having both male and female sex organs; hermaphrodism. (botany) The condition of being monoecious, the state of having pistils and stamens on separate flowers of the same plant.
What do you mean by Herkogamy?
Herkogamy (or hercogamy) is the spatial separation of the anthers and stigma in hermaphroditic angiosperms. It is a common strategy for reducing self-fertilization.
What is flower in biology class 12?
A flower can be defined as the reproductive unit of any angiosperms. Flowers carry out sexual reproduction in angiosperms. A typical flower is generally an attractively modified stem with a condensed axis. A flower has four different parts, they are – calyx, corolla, androecium, and gynoecium.
What is homogamy plant?
Homogamy is when the anthers and the stigma of a flower are being matured at the same time. The action of self-pollination guides the plant to homozygosity, causing a specific gene to be received from each of the parents leading to the possession of two exact formats of that gene.
What is Dichogamy in plant breeding?
Dichogamy. (from the Greek dikho-apart and gamous-marriage) It refers to maturation of anthers and stigma of the same flowers at different times. Dichogamy promotes cross pollination even in the hermaphrodite species.
What is Dichogamy Shaalaa com?
Dichogamy is a cross-pollination promoting device. In this, the bisexual flower promotes cross-pollination by maturing the carpel and stamen at different times.
What is 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.
What is Hydrophily 12th class?
Hydrophily is the term given to pollination occurred by water.
What is self sterility?
Self-sterility is a mechanism that prevents self-pollination. It is also called self-incompatibility. In this genetic mechanism, the growth of the pollen tube in the pistil or the germination of pollen grains is inhibited and this prevents the fertilization of the ovules from the pollen of the same flower.
What is called Pollinium?
A pollinium (plural pollinia) is a coherent mass of pollen grains in a plant that are the product of only one anther, but are transferred, during pollination, as a single unit. This is regularly seen in plants such as orchids and many species of milkweeds (Asclepiadoideae).
How do Dichogamy Favours cross pollination?
Advantages of cross-pollination: – Dichogamy is the maturation of sex organs i.e. anther and stigma in the plants at different times. Dichogamy may be interflora and intrafloral. In diclinous species, it exists among flowers. So, that is why floral mechanism favours cross-pollination.
What is the difference between Homogamy and Dichogamy?
This is known as homogamy. In such flowers, pollen grains of the flower can pollinate the stigma of the same flower whereas dichogamy is the condition where stamens and carpels of a bisexual flower mature at different times and hence self-pollination is eliminated.
Is Dichogamy is a spatial separation of anthers and stigma?
The evolution of wind pollination in angiosperms Depending upon inflorescence architecture and the degree of dichogamy (temporal separation of anthers and stigmas) or herkogamy (spatial separation of anthers and stigmas), variable levels of outcrossing might be possible.
What is unisexual flower?
The flower that has only male or female reproductive parts i.e., either stamens or carpels are present are unisexual flowers. Examples of unisexual flowers are Bitter gourd, papaya, pumpkin, and cucumber.
What is called monoecious?
Definition of monoecious 1 : having pistillate and staminate flowers on the same plant. 2 : having male and female sex organs in the same individual : hermaphroditic.
What is Monoecy and Dioecy?
1 “Dioecious” describes a plant group in which individual plants have either male and female parts, but not both. “Monoecious” describes the group species in which each plant bears both male and female flowers.
What is Heterostyly and herkogamy?
Heterostyly: It is the condition in which 2-3 types of flowers within the same plant and such flowers have the difference in length of style and stamens. > Herkogamy: It is the condition in which the pollen grains fail to reach the stigma.