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Sexual Reproduction in Flowering Plants PPT Biology Class 12

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Sexual Reproduction in
Flowering Plants
Class-12
Page 2


Sexual Reproduction in
Flowering Plants
Class-12
All flowering plants
(angiosperms) show
sexual reproduction.
 Flowers are the sites of
sexual reproduction.
Sexual Reproduction in Flowering Plants
Page 3


Sexual Reproduction in
Flowering Plants
Class-12
All flowering plants
(angiosperms) show
sexual reproduction.
 Flowers are the sites of
sexual reproduction.
Sexual Reproduction in Flowering Plants
Pre-fertilization: Structures & Events
Hormonal and structural changes lead to floral
primordium differentiation. 
Inflorescences bear floral buds and ultimately flowers.
In the flower the male and female reproductive structures, the
androecium and the gynoecium differentiate and develop.
Page 4


Sexual Reproduction in
Flowering Plants
Class-12
All flowering plants
(angiosperms) show
sexual reproduction.
 Flowers are the sites of
sexual reproduction.
Sexual Reproduction in Flowering Plants
Pre-fertilization: Structures & Events
Hormonal and structural changes lead to floral
primordium differentiation. 
Inflorescences bear floral buds and ultimately flowers.
In the flower the male and female reproductive structures, the
androecium and the gynoecium differentiate and develop.
Androecium: The Male Reproductive Part
It is the male reproductive part of the flower.
 It consists of a whorl of stamens. 
Their number and length are variable in different
species.
Page 5


Sexual Reproduction in
Flowering Plants
Class-12
All flowering plants
(angiosperms) show
sexual reproduction.
 Flowers are the sites of
sexual reproduction.
Sexual Reproduction in Flowering Plants
Pre-fertilization: Structures & Events
Hormonal and structural changes lead to floral
primordium differentiation. 
Inflorescences bear floral buds and ultimately flowers.
In the flower the male and female reproductive structures, the
androecium and the gynoecium differentiate and develop.
Androecium: The Male Reproductive Part
It is the male reproductive part of the flower.
 It consists of a whorl of stamens. 
Their number and length are variable in different
species.
Filament
Anther
Parts of 
stamen
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FAQs on Sexual Reproduction in Flowering Plants PPT Biology Class 12

1. What is sexual reproduction in flowering plants?
Ans. Sexual reproduction in flowering plants is the process by which plants produce offspring through the fusion of male and female gametes. It involves the transfer of pollen from the male reproductive organ (anther) to the female reproductive organ (stigma), leading to fertilization and the formation of seeds.
2. How do flowering plants reproduce sexually?
Ans. Flowering plants reproduce sexually through a series of steps. First, the male reproductive organ (stamen) produces pollen grains containing male gametes. These pollen grains are transferred to the female reproductive organ (pistil) through various means like wind, insects, or animals. Upon reaching the stigma of the pistil, the pollen grain germinates and forms a pollen tube, which grows down into the ovary. The male gametes then travel through this tube and fertilize the egg cell, resulting in the formation of seeds.
3. What are the advantages of sexual reproduction in flowering plants?
Ans. Sexual reproduction in flowering plants offers several advantages. Firstly, it leads to genetic diversity as it involves the fusion of gametes from two different individuals, allowing for the creation of offspring with unique combinations of traits. This genetic variation helps plants adapt to changing environmental conditions and increases their chances of survival. Secondly, sexual reproduction promotes the elimination of harmful genetic mutations through recombination. Lastly, it allows for the exchange of genetic material between different populations, leading to the introduction of new traits and the enhancement of overall species fitness.
4. What are the main reproductive structures in flowering plants?
Ans. The main reproductive structures in flowering plants are the stamen and pistil. The stamen is the male reproductive organ and consists of two parts: the filament and the anther. The anther contains pollen sacs that produce pollen grains. The pistil, on the other hand, is the female reproductive organ and consists of three parts: the stigma, style, and ovary. The stigma is the receptive surface where pollen grains land, the style is a tube-like structure that connects the stigma to the ovary, and the ovary contains ovules, which develop into seeds once fertilized.
5. How do flowers attract pollinators for sexual reproduction?
Ans. Flowers employ various strategies to attract pollinators for sexual reproduction. They produce colorful petals and emit pleasant scents to catch the attention of insects, birds, or other animals. Additionally, flowers often provide nectar as a reward for pollinators, which serves as an incentive for them to visit and transfer pollen. Some flowers have specific adaptations, such as tubular shapes or landing platforms, to accommodate certain types of pollinators. By attracting pollinators, flowers ensure the effective transfer of pollen between individuals, promoting successful sexual reproduction.
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