Download here: http://www.agrislide.com/fertilization-plants-ppt/
This is a nice presentation on "Fertilization of plants". you can found all of the information of plant fertilization on this presentation.
Download here: http://www.agrislide.com/fertilization-plants-ppt/
This is a nice presentation on "Fertilization of plants". you can found all of the information of plant fertilization on this presentation.
Pollination in plants is the process where pollen is transferred from the anther, the male part of a flower, to the stigma, the female part of a flower. Pollen can be transferred to one plant or even a nearby plant so that they can get fertilized and make more flowers. This happens in plants that have flowers called angiosperms.
In this lesson you will learn about :
1) What is Pollination?
2) Types of Pollination
3) Self-Pollination
- Adaptations for Self-Pollination
- Advantages and Disadvantages of Self-Pollination
4) Cross-Pollination
- Adaptations for Cross-Pollination
- Advantages and Disadvantages of Cross-Pollination
5) Agents of Cross-Pollination
- Entomophilous
- Anemophilous
- Hydrophilous
6) Artificial Pollination
I hope this document is helpful to you. Please share the document with your friends if you think this will benefit them. Get ready for the next lesson. Thanks.
Pollination : Types and significance.
The Seminar presented by Biswajit Das
L.T.K. College, Department of Botany.
In order that a plant is able to produce seeds, the male and female gametes must come together.
The male gamete is produced by the androecium within the pollen grain, while the female gamete is produced by the gynoecium within the ovule.
Pollination is the process that helps in bringing male and female gametes together.
Self-pollination and cross-pollination are two major ways. Flowering plants are adapted to use vivid agents, like biotic and abiotic.
.............................................................. Thank You.
Plant fertilization is the union of male and female gametes (reproductive cells) to produce a zygote (fertilized egg)
Double Fertilization
Both the male gametes/sperms participate in sexual reproduction.
Two male gametes fuse with one female gamete wherein one male gamete fertilizes the egg to form a zygote, whereas the other fuses with two polar nuclei to form an endosperm
Triple fusion is the fusion of the male gamete with two polar nuclei inside the embryo sac of the angiosperm.
Porogamy - entry through the micropyle.
Chalazogamy - entry through the Chalaza
Mesogamy - entry through the middle part or the integuments
Steps leading to fertilization
Germination of the pollen grain:
Stigma function is to provide place of lodging and germination of the pollen grain after pollination.
Types of stigmas-
Wet stigmas
Secrete exudates like water and other nutrients
In the form of droplets on the stigma.
Exudates made up of a mix of water, lipids, sugars, amino acids, phenolic compounds.
Highly viscous and adhesive. Ex: Petunia, Zea etc.
Dry stigma
Do not secrete exudates Ex: Gossypium
Double Fertilization & Triple Fusion:
Both the male gametes are involved in the fertilization.
Fertilize two different components of the embryo sac - Double Fertilization
One fuses with the egg nucleus (syngamy) -> Zygote(2n)
second fuses with polar nuclei -> primary endosperm nucleus (PEN).
Involves fusion of three nuclei - Triple fusion -> Endosperm(3n)
Pollen tube in the synergids:
Entry only through micropyle. Guided by oburator
Presence of chemotropic substances
Collapse of one the synergids prior to entry of the pollen tube.
Pollen tube in the synergids:
Entry only through micropyle. Guided by oburator
Presence of chemotropic substances
Collapse of one the synergids prior to entry of the pollen tube.
Discharge of pollen tube contents (two male gametes, vegetative nucleus and cytoplasm) into the synergids.
Disorganization of tube nucleus
Polyspermy &Heterofertilization
Heterofertilization - Type of double fertilization in plants in which endosperm and embryo are genetically different.
This happens when two different sperm nuclei from two different pollen tubes happen to enter the same embryo sac.
Dr. T. Annie Sheron
Annie Sheron
Kakatiya Government College
FERTILIZATION IS A FUSION OF MALE GAMETE WITH FEMALE GAMETES .ANDROECIUM AND GYNOECIUM ARE THE FERTILE PARTS OF A PLANT.THEY ARE DIRECTLY INVOLVED IN THE PROCESS OF FERTILIZATION.THE FUSION BETWEEN THE MALE GAMETES AND EGG FORMING SEED AND FRUIT.HERE THE OVULE DEVELOP IN TO SEED AND OVARY DEVELOP IN TO FRUIT.
Fertilization is the process of fusion of the female gamete, the ovum or egg and the male gamete produced in the pollen tube by the pollen grain. Fertilization in flowering plants was discovered by Strassburger in 1884.
Flowers are the reproductive structures of angiosperms. They vary greatly physically and are of great diversity in methods of reproduction. The process of fertilization in plants occurs when gametes in haploid conditions meet to create a zygote which is diploid.
The male gametes of the flower are transferred on to the female reproductive organs through pollinators. The final product of this process is the formation of embryo in a seed.
In this lesson you will learn about :
1) What is Fertilization?
2) The Pollen Grain (Male Gamete)
3) The Ovule (Containing Female Gamete)
4) Microsporogenesis and Megasporogenesis
5) Germination of Pollen Grain
6) Double Fertilization
7) Post Fertilization Events
I hope this document is helpful to you. Please share the document with your friends if you think this will benefit them. Get ready for the next lesson. Thanks.
Pollination in plants is the process where pollen is transferred from the anther, the male part of a flower, to the stigma, the female part of a flower. Pollen can be transferred to one plant or even a nearby plant so that they can get fertilized and make more flowers. This happens in plants that have flowers called angiosperms.
In this lesson you will learn about :
1) What is Pollination?
2) Types of Pollination
3) Self-Pollination
- Adaptations for Self-Pollination
- Advantages and Disadvantages of Self-Pollination
4) Cross-Pollination
- Adaptations for Cross-Pollination
- Advantages and Disadvantages of Cross-Pollination
5) Agents of Cross-Pollination
- Entomophilous
- Anemophilous
- Hydrophilous
6) Artificial Pollination
I hope this document is helpful to you. Please share the document with your friends if you think this will benefit them. Get ready for the next lesson. Thanks.
Pollination : Types and significance.
The Seminar presented by Biswajit Das
L.T.K. College, Department of Botany.
In order that a plant is able to produce seeds, the male and female gametes must come together.
The male gamete is produced by the androecium within the pollen grain, while the female gamete is produced by the gynoecium within the ovule.
Pollination is the process that helps in bringing male and female gametes together.
Self-pollination and cross-pollination are two major ways. Flowering plants are adapted to use vivid agents, like biotic and abiotic.
.............................................................. Thank You.
Plant fertilization is the union of male and female gametes (reproductive cells) to produce a zygote (fertilized egg)
Double Fertilization
Both the male gametes/sperms participate in sexual reproduction.
Two male gametes fuse with one female gamete wherein one male gamete fertilizes the egg to form a zygote, whereas the other fuses with two polar nuclei to form an endosperm
Triple fusion is the fusion of the male gamete with two polar nuclei inside the embryo sac of the angiosperm.
Porogamy - entry through the micropyle.
Chalazogamy - entry through the Chalaza
Mesogamy - entry through the middle part or the integuments
Steps leading to fertilization
Germination of the pollen grain:
Stigma function is to provide place of lodging and germination of the pollen grain after pollination.
Types of stigmas-
Wet stigmas
Secrete exudates like water and other nutrients
In the form of droplets on the stigma.
Exudates made up of a mix of water, lipids, sugars, amino acids, phenolic compounds.
Highly viscous and adhesive. Ex: Petunia, Zea etc.
Dry stigma
Do not secrete exudates Ex: Gossypium
Double Fertilization & Triple Fusion:
Both the male gametes are involved in the fertilization.
Fertilize two different components of the embryo sac - Double Fertilization
One fuses with the egg nucleus (syngamy) -> Zygote(2n)
second fuses with polar nuclei -> primary endosperm nucleus (PEN).
Involves fusion of three nuclei - Triple fusion -> Endosperm(3n)
Pollen tube in the synergids:
Entry only through micropyle. Guided by oburator
Presence of chemotropic substances
Collapse of one the synergids prior to entry of the pollen tube.
Pollen tube in the synergids:
Entry only through micropyle. Guided by oburator
Presence of chemotropic substances
Collapse of one the synergids prior to entry of the pollen tube.
Discharge of pollen tube contents (two male gametes, vegetative nucleus and cytoplasm) into the synergids.
Disorganization of tube nucleus
Polyspermy &Heterofertilization
Heterofertilization - Type of double fertilization in plants in which endosperm and embryo are genetically different.
This happens when two different sperm nuclei from two different pollen tubes happen to enter the same embryo sac.
Dr. T. Annie Sheron
Annie Sheron
Kakatiya Government College
FERTILIZATION IS A FUSION OF MALE GAMETE WITH FEMALE GAMETES .ANDROECIUM AND GYNOECIUM ARE THE FERTILE PARTS OF A PLANT.THEY ARE DIRECTLY INVOLVED IN THE PROCESS OF FERTILIZATION.THE FUSION BETWEEN THE MALE GAMETES AND EGG FORMING SEED AND FRUIT.HERE THE OVULE DEVELOP IN TO SEED AND OVARY DEVELOP IN TO FRUIT.
Fertilization is the process of fusion of the female gamete, the ovum or egg and the male gamete produced in the pollen tube by the pollen grain. Fertilization in flowering plants was discovered by Strassburger in 1884.
Flowers are the reproductive structures of angiosperms. They vary greatly physically and are of great diversity in methods of reproduction. The process of fertilization in plants occurs when gametes in haploid conditions meet to create a zygote which is diploid.
The male gametes of the flower are transferred on to the female reproductive organs through pollinators. The final product of this process is the formation of embryo in a seed.
In this lesson you will learn about :
1) What is Fertilization?
2) The Pollen Grain (Male Gamete)
3) The Ovule (Containing Female Gamete)
4) Microsporogenesis and Megasporogenesis
5) Germination of Pollen Grain
6) Double Fertilization
7) Post Fertilization Events
I hope this document is helpful to you. Please share the document with your friends if you think this will benefit them. Get ready for the next lesson. Thanks.
this topic objectives are: differentiate self- pollination and cross pollination,draw self-pollination in plants and appreciate the importance of insects in pollination.
En botánica, la apomixia ó apomixis es un modo de reproducción asexual, sin fertilización y sin meiosis. Una apomíctica ó planta apomíctica produce semillas que son genéticamente idénticas a la planta madre. Aunque evolutivamente las ventajas de la reproducción sexual se pierden, la apomixis permite la fijación indefinida de genotipos altamente adaptados. Esta ventaja de la apomixis es -desde el punto de vista genético- la misma que presenta la multiplicación vegetativa. No obstante, en la apomixis también se produce la dispersión de las semillas, lo que permite a las plantas apomícticas explorar y conquistar nuevos ambientes.
Sexual reproduction is a biological process by which offspring are produced by the combination of genetic material from two parent organisms. It involves the fusion of specialized reproductive cells called gametes, which typically come from two different individuals of the same species.
Gamete Formation: Each parent produces specialized reproductive cells called gametes. In most animals, the male parent produces small, mobile gametes called sperm, while the female parent produces larger, usually immobile gametes called eggs. In plants, the male gamete is typically contained within pollen grains, and the female gamete is located within ovules.
Fertilization: The gametes from the male and female parents fuse during fertilization, forming a zygote. This process usually occurs through the union of the sperm and egg. Fertilization typically occurs externally in many aquatic organisms and internally in most terrestrial organisms.
Genetic Variation: One of the key features of sexual reproduction is the generation of genetic diversity. Offspring produced through sexual reproduction inherit genetic material from both parents, leading to genetic variation among individuals within a population. This genetic diversity is important for the adaptation and evolution of species over time.
Meiosis: In preparation for sexual reproduction, specialized cell division called meiosis occurs in the cells that give rise to gametes. Meiosis ensures that the resulting gametes contain only half the number of chromosomes found in other body cells, allowing the union of gametes to restore the full chromosome number in the zygote.
Sexual reproduction is the predominant mode of reproduction in multicellular organisms, including most animals, plants, and fungi. It offers several advantages, such as genetic diversity, which enhances the ability of organisms to adapt to changing environments and improves the overall fitness of populations.
Sexual reproduction is common in many multicellular organisms, including animals, plants, and fungi. It contrasts with asexual reproduction, where offspring are produced from a single parent and are genetically identical or very similar to that parent. The diversity introduced by sexual reproduction is advantageous for evolutionary processes, as it can lead to individuals with new combinations of traits that may be better adapted to changing environments.
Presentation Includes very important topics related to Pollination and Double Fertilization in Flowering Plants (Angiosperms). The presentatio will be important for Class XII and X students as well many questions can be asked from the presentation.
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2. Objectives
• Define the following terms: pollination,
fertilization, double fertilization.
• Types of pollination.
• Agents of pollination.
• Function and parts of a flowering plant.
• Explain the sequence of events from pollination
to fertilization using annotated diagrams.
• Explain the significance of double fertilization in
the embryo sac.
3. Pollination
• Pollination is the transfer of pollen from the
anthers of a flower to the stigma of the same
flower or of another flower. Plants can be
pollinated whether by itself (self-pollination)
and or with another plant (cross-pollination).
6. Difference between self-pollination
and cross-pollination
• Self-pollination is the transfer of pollen grains
from the anther of a flower to the stigma of
either the same or genetically similar flower
while cross-pollination is the transfer of pollen
from the anther of a flower on one plant to a
stigma of a flower on another plant of the
same species.
7. Agent of pollination
• Pollen grains from another anther is
transferred onto the stigma of the recipient
flower by any of these pollinated agents:
wind, animal, insect, mechanical explosive and
water.
8. Process of pollination in terms of
insect pollination
• Pollinators gather nectar for food. As
pollinators move from one flower to another to
gather more nectar, the pollen grains on the
pollinator’s body gets transferred to the stigma
of the recipient flower. For example: Bees.
10. Fertilization
• Fertilization is the process of fusion of the
female gamete, the ovule and the male
gamete produced in the pollen tube by the
pollen grain.
11. Fertilization process
• Pollen tubes from the pollen grains will start to
grow into the style. This will create a pathway
for the pollen grain to travel down to the ovary.
•Once the pollen grain reaches the ovary, the
male sex cell inside the pollen grain fuses with
the female sex cell inside the ovule.
14. Outlined steps and diagram of
plant from pollination to
fertilization
• Pollen grains land on the
sticky stigma.
• A pollen tube grows down
the style, followed by
male sperm nuclei.
• The sperm nuclei fuse
with the female ovules.
• The ovules develop into
seed, and the ovary
develops into fruit.
15. DOUBLE FERTILIZATION
Double fertilization is
complex mechanism of
fertilization in flowering
plants (angiosperms).
Double fertilization is
joining of a female
gametophyte with
two male gametes.
16. DIAGRAM SHOWING A FLOWERING
PLANT FROM POLLINATION TO
DOUBLE FERTILIZATION
17.
18. THE SIGNIFICANCE OF DOUBLE
FERTILIZATION IN THE EMBRYO
SAC
• The triploid endosperm nucleus divides by
mitosis to give a tissue that surrounds the
developing embryo. In some cases, the
endosperm is used up before the embryo is
mature.