This document discusses pollination, defining it as the transfer of pollen grains from the anther to the stigma of a flower. It describes the two main types of pollination - self-pollination and cross-pollination. Self-pollination involves the transfer of pollen grains within or between flowers on the same plant, while cross-pollination involves the transfer between genetically different plants. The document outlines various pollination mechanisms like anemophily, entomophily and ornithophily and discusses the adaptations of flowers to each. It also describes methods to ensure cross-pollination and the importance and process of artificial pollination as well as coevolution between flowers and
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.
Double fertilization is the process found in angiosperms in which out of the two male gametes released inside the embryo sac, one fuses with the egg cell (syngamy) and another fuse with secondary nucleus (triple fusion).
Pollination, transfer of pollen grains from the stamens, the flower parts that produce them, to the ovule-bearing organs or to the ovules (seed precursors) themselves. In plants such as conifers and cycads, in which the ovules are exposed, the pollen is simply caught in a drop of fluid secreted by the ovule. In flowering plants, however, the ovules are contained within a hollow organ called the pistil, and the pollen is deposited on the pistil’s receptive surface, the stigma. There the pollen germinates and gives rise to a pollen tube, which grows down through the pistil toward one of the ovules in its base. In an act of double fertilization, one of the two sperm cells within the pollen tube fuses with the egg cell of the ovule, making possible the development of an embryo, and the other cell combines with the two subsidiary sexual nuclei of the ovule, which initiates formation of a reserve food tissue, the endosperm. The growing ovule then transforms itself into a seed.
Pollen pistil interaction
Types of Incompatibility in plants
Methods to overcome Incompatibility
Prepared by
Dr. T. Annie Sheron
Assistant Professor of Botany
DEPARTMENT OF BOTANY
KAKATIYA GOVERNMENT COLLEGE, HANAMKONDA
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.
Double fertilization is the process found in angiosperms in which out of the two male gametes released inside the embryo sac, one fuses with the egg cell (syngamy) and another fuse with secondary nucleus (triple fusion).
Pollination, transfer of pollen grains from the stamens, the flower parts that produce them, to the ovule-bearing organs or to the ovules (seed precursors) themselves. In plants such as conifers and cycads, in which the ovules are exposed, the pollen is simply caught in a drop of fluid secreted by the ovule. In flowering plants, however, the ovules are contained within a hollow organ called the pistil, and the pollen is deposited on the pistil’s receptive surface, the stigma. There the pollen germinates and gives rise to a pollen tube, which grows down through the pistil toward one of the ovules in its base. In an act of double fertilization, one of the two sperm cells within the pollen tube fuses with the egg cell of the ovule, making possible the development of an embryo, and the other cell combines with the two subsidiary sexual nuclei of the ovule, which initiates formation of a reserve food tissue, the endosperm. The growing ovule then transforms itself into a seed.
Pollen pistil interaction
Types of Incompatibility in plants
Methods to overcome Incompatibility
Prepared by
Dr. T. Annie Sheron
Assistant Professor of Botany
DEPARTMENT OF BOTANY
KAKATIYA GOVERNMENT COLLEGE, HANAMKONDA
A flower, sometimes known as a bloom or blossom, is the reproductive structure found in flowering plants. The biological function of a flower is to effect reproduction, usually by providing a mechanism for the union of sperm with eggs.
In addition to facilitating the reproduction of flowering plants, flowers have long been admired and used by humans to bring beauty to their environment, and also as objects of romance, ritual, religion, medicine and as a source of food.
In this lesson you will learn about :
1) Flower - Definition & Functions
2) Floral Symmetry
3) Pedicellate & Sessile Flowers
4) Insertion of Floral Leaves on the Thalamus
5) Parts of a Flower
6) Some Important Terms related to Flowers
7) Floral Whorls - Calyx, Corolla, Androecium and Gynoecium
8) Placentation
9) Inflorescenece
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.
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.
seed is scientifically the mature embryo.
these powerpoint slides include the basic concepts of seed,its importance, parts of seed, composition,seed structure, seed development and embryogenesis.
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.
For CBSE class 10th and 12
Have you ever wondered why bees are attracted to flowers? Flowers look beautiful and are fragrant, but there is a reason behind this – flowers actually help plants to reproduce. Flowering plants have seeds, carry the genetic information of the parents and develop into a new plant.
Explore pollination notes provided here to learn about the process and types of pollination.
Table of Contents
Pollination
Process
Types
The process of pollination begins when the pollen grains from the respective flowers lands on the stigma and form a pollen tube with the style length, which connects both the stigma and ovary. After the completion of the pollen tube, the pollen grain starts transmitting sperm cells from the grain to the ovary.
Later the process of fertilization in plants will take place when the sperm cells will reach the ovary and egg cells. The seed is then released from the parent plant and making it able to grow into a plant and continue the reproductive cycle with the use of the pollination method.
A flower, sometimes known as a bloom or blossom, is the reproductive structure found in flowering plants. The biological function of a flower is to effect reproduction, usually by providing a mechanism for the union of sperm with eggs.
In addition to facilitating the reproduction of flowering plants, flowers have long been admired and used by humans to bring beauty to their environment, and also as objects of romance, ritual, religion, medicine and as a source of food.
In this lesson you will learn about :
1) Flower - Definition & Functions
2) Floral Symmetry
3) Pedicellate & Sessile Flowers
4) Insertion of Floral Leaves on the Thalamus
5) Parts of a Flower
6) Some Important Terms related to Flowers
7) Floral Whorls - Calyx, Corolla, Androecium and Gynoecium
8) Placentation
9) Inflorescenece
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.
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.
seed is scientifically the mature embryo.
these powerpoint slides include the basic concepts of seed,its importance, parts of seed, composition,seed structure, seed development and embryogenesis.
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.
For CBSE class 10th and 12
Have you ever wondered why bees are attracted to flowers? Flowers look beautiful and are fragrant, but there is a reason behind this – flowers actually help plants to reproduce. Flowering plants have seeds, carry the genetic information of the parents and develop into a new plant.
Explore pollination notes provided here to learn about the process and types of pollination.
Table of Contents
Pollination
Process
Types
The process of pollination begins when the pollen grains from the respective flowers lands on the stigma and form a pollen tube with the style length, which connects both the stigma and ovary. After the completion of the pollen tube, the pollen grain starts transmitting sperm cells from the grain to the ovary.
Later the process of fertilization in plants will take place when the sperm cells will reach the ovary and egg cells. The seed is then released from the parent plant and making it able to grow into a plant and continue the reproductive cycle with the use of the pollination method.
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Pollination Detailed Explanation with examples Sumita Sinha
Pollination and Its types with examples.Contrivances of self - Pollination and Cross - Pollination.Agents of Pollination is also clearly mentioned.The topic is clearly explained with relevant images for better understanding.
Modes of Pollination.pptxhsbsbshshs hdhjZackAbukar
Definition: Extension approaches can be defined as a style of action, embodying the philosophy of an extension system which, by and large determines the direction and nature/style of the various aspects of that system, such as its structure, leadership, program, methods and techniques, resources, and linkages.Definition: Extension approaches can be defined as a style of action, embodying the philosophy of an extension system which, by and large determines the direction and nature/style of the various aspects of that system, such as its structure, leadership, program, methods and techniques, resources, and linkages.Definition: Extension approaches can be defined as a style of action, embodying the philosophy of an extension system which, by and large determines the direction and nature/style of the various aspects of that system, such as its structure, leadership, program, methods and techniques, resources, and linkages.Definition: Extension approaches can be defined as a style of action, embodying the philosophy of an extension system which, by and large determines the direction and nature/style of the various aspects of that system, such as its structure, leadership, program, methods and techniques, resources, and linkages.Definition: Extension approaches can be defined as a style of action, embodying the philosophy of an extension system which, by and large determines the direction and nature/style of the various aspects of that system, such as its structure, leadership, program, methods and techniques, resources, and linkages.Definition: Extension approaches can be defined as a style of action, embodying the philosophy of an extension system which, by and large determines the direction and nature/style of the various aspects of that system, such as its structure, leadership, program, methods and techniques, resources, and linkages.Definition: Extension approaches can be defined as a style of action, embodying the philosophy of an extension system which, by and large determines the direction and nature/style of the various aspects of that system, such as its structure, leadership, program, methods and techniques, resources, and linkages.Definition: Extension approaches can be defined as a style of action, embodying the philosophy of an extension system which, by and large determines the direction and nature/style of the various aspects of that system, such as its structure, leadership, program, methods and techniques, resources, and linkages.Definition: Extension approaches can be defined as a style of action, embodying the philosophy of an extension system which, by and large determines the direction and nature/style of the various aspects of that system, such as its structure, leadership, program, methods and techniques, resources, and linkages.Definition: Extension approaches can be defined as a style of action, embodying the philosophy of an extension system which, by and large determines the direction and nature/style of the various aspect
Sexual and Asexual reproduction in plants with pollination and development of gametophytes and double fertilization with embryo and endosperm formation.
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.
2. POLLINATION
Definition:
The transfer of pollen grains
from the anther to the stigma of
a flower.
Pollen grains are immobile. They
cannot reach the stigma by
themselves. An external agent is
required for this. It can be wind,
water, animal, gravity or growth
contact.
5. SELF POLLINATION
It is the transfer of pollen grains from the anther of a
flower to the stigma of either the same or
genetically similar flower.
Accordingly, self pollination is of two types,
autogamy and geitonogamy.
6. AUTOGAMY
It is a type of self pollination in which an intersexual
or perfect flower is pollinated by its own pollen.
Autogamy occurs by 2 methods :
- Homogamy :The anthers and stigmas of
chasmogamous or open flowers are brought
together by growth, bending or folding.
- Cleistogamy : In cleistogamous flowers, the
anthers dehisce inside closed flowers. Growth of
style brings the pollen grains in contact with stigma.
Pollination and seed set are assured. Pollinators
are not required.
7.
8. GEITONOGAMY
It is a type of pollination in which pollen grains of
one flower are transferred to the stigma of
another flower belonging to either the same
plant or genetically similar plant. In geitonogamy,
the flowers often show modifications similar to ones
found in xenogamy or cross pollination.
9. ADVANTAGES & DISADVANTAGES
Advantages of self Pollination:
1. It maintains the parental characters
or purity of the race indefinitely.
2. Self pollination is used to maintain
pure lines for hybridisation
experiments.
3. The plant does not need to
produce large number of pollen
grains.
4. Flowers do not develop devices for
attracting insect pollinators.
Disadvantages of Self Pollination:
1. New useful characters are seldom
introduced.
2. Vigour and vitality of the race
decreases with prolonged self
pollination.
3. Immunity to diseases decreases.
4. adaptability to changed environment
are reduced.
10. CROSS POLLINATION
(XENOGAMY, ALLOGAMY):
Cross pollination is the transfer of pollen grains
from the anther of one flower to the stigma of a
genetically different flower.
Cross pollination is performed with the help of an
external agency.
11.
12. ANEMOPHILY
It is a mode of cross pollination or transfer
of pollen grains through the agency of
wind.
e.g., Coconut Palm, Date Palm, Maize,
many grasses, Cannabis.
Characterstics :
The flowers are colourless, odourless and
nectarless.
Pollen grains are light, small and winged or
dusty, dry smooth, nonsticky and
unwettable.
stigma is hairy, feathery or branched to
catch the wind-borne pollen grains.
Pollen grains are produced in very large
number.
13.
14. HYDROPHILY
It is the mode of pollination or transfer
of pollen grains through the agency of
water.
Eg. Zoostera , vallisneria.
Characters:
Flowers are small and inconspicuous.
Nectar and odour are absent.
Pollen grains are light and unwettable
due to presence of mucliage cover.
Stigma is long, sticky but unwettable.
16. ENTOMOPHILY
the pollen grains are transferred to a
mature through the agency of insects like
moths, butterflies, wasps, bees, beetles,
etc.
Example:
Characters :
They are showy or brightly coloured.
Most insect pollinated flowers have a
landing platform.
The pollen grains are spiny, heavy and
surrounded by a yellow oily sticky
substance called pollenkit.
Stigmas are often inserted and sticky.
Some flowers provide safe place to insects
for laying eggs, e.g., Yucca.
17.
18. ORNITHOPHILY
It is the mode of allogamy performed by
birds. Only a few types of birds are
specialised for this. They usually have
small size and long beaks.
Example :
Characters :
Ornithophilous flowers are usually brightly
coloured— red, orange, yellow or blue.
The floral parts are commonly leathery.
The ornithophilous flowers secrete
abundant watery nectar or have edible
parts.
Scent is often absent.
19. METHODS TO ENSURE CROSS POLLINATION
Dichogamy :
Anthers and stigmas mature at different
times in a bisexual flower so as to prevent
self pollination.
- Protandry Anthers mature earlier than
stigma of the same flower. Their pollen
grains become available to stigmas of the
older flowers, e.g., Sunflower, Salvia,
- Protogyny
Stigmas mature earlier so that they get
pollinated before the anthers of the same
flower develop pollen grains, e.g., Mirabilis
jalapa (Four O’Clock), Gloriosa, Plantago.
20. Herkogamy :
In some bisexual flowers the
structure of male & female sex
organs itself prove a barrier to self
pollination.
Self Sterility (Self
Incompatibility):
Pollen grains of a flower do not
germinate on the stigma of the
same flower due to presence of
similar self sterile gene (S,S3 in
pistil and S1 or S3 in pollen grain),
e.g., Tobacco, Potato, Crucifers.
21. Heterostyly :
There are 2 or 3 types of flowers with different heights of styles and
stamens.
(a) Diheterostyly (Dimorphic Heterostyly):
There are two types of flowers
- Pin eyed (long style and short stamens)
- Thrum eyed (short style and long stamens), e.g., Primula
(Primrose),
(b) Triheterostyly (Trimorphic Heterostyly or tristyly):
There are three types of flowers with different heights of styles.
e.g., Lythrum. Pollination occurs between anthers and stigmas of the
same height present in different flowers
22. ARTIFICIAL POLLINATION
This technique is used for the purpose of
Hybridization.
It involves pollination of desired female parents
with pollen from the desired male parent, taking
all precautions to prevent contamination of stigma
with undesired pollen.
In unisexual plants the procedure is simple but its
complicated in bisexual ones.
2 processes that takes place in bisexual flower :
- Emasculation
- Bagging
23.
24. IMPORTANCE OF CROSS POLLINATION:
ADVANTAGES
Cross pollination
introduces genetic re-
combinations and hence
variations in the progeny.
Cross pollination
increases the
adaptability of the
offspring towards
changes in the
environment.
It makes the organisms
better fitted in the
struggle for existence.
The plants produced
through cross pollination
are more resistant to
diseases.
DISADVANTAGES
•A factor of chance is always
involved in cross .pollination.
•It is less economical.
•Some undesirable characters
may creep in the race.
•The very good characters of
the race are likely to be
spoiled.
25. COEVOLUTION OF FLOWER AND ITS POLLINATOR
SPECIES:
Coevolution is the evolution in two species that interact
extensively with one another so that each acts as a major
force of natural selection on the other.
When one evolves a new feature or modifies itself, the
other evolves new adaptations in response of it.
This constant mutual feed back modification between the two
species is known as coevolution.
The coevolution of the flower and its pollinator species are
tightly linked with one another.
26. Disa nivea is a rare orchid found only in a few places in South
Africa, and until Johnson came to study it, no one knew how
it was pollinated. After a lot of patient orchid-watching, he and
his colleagues discovered that it is visited exclusively by the
fly shown in the picture. Its proboscis is well-matched to the
length of the orchid, and the orchid grows pollen in just the
right place so that they get stuck to the fly. You can see them
in this picture–the two dangling yellow packets on the fly’s
snout. This fly is named as Orchid fly.