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Class notes Neet Biology Class XII
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Chapter 1Reproduction in Lower and Higher Plants
1. Definitions and Significance of Reproduction in Plants
Definition : The biological process by which new individual organisms are produced from their parents. It is
essential for the continuation of species.
Significance:
o Genetic Diversity: Sexual reproduction promotes genetic variation, which enhances adaptability
and survival in changing environments.
o Population Maintenance: Reproduction allows plants to maintain and increase their populations.
o Evolution: It is crucial for the evolution of species, enabling adaptation to environmental changes.
2.Types of Reproduction: Asexual and Sexual Reproduction
Asexual Reproduction: Involves a single parent and produces offspring that are genetically identical to the
parent (clones). Common methods include:
• Fragmentation
• Budding
• Vegetative propagation
Sexual Reproduction: Involves the fusion of male and female gametes, resulting in genetically diverse
offspring. This process includes the formation of flowers, pollination, fertilization, and seed development.
3.Asexual Reproduction in Lower Plants
Examples:
• Algae: Many algae reproduce asexually through binary fission, fragmentation, or by forming
specialized structures like spores.
➢ Example: Chlamydomonas reproduces by binary fission.
• Bryophytes (e.g., mosses): Asexual reproduction occurs through vegetative methods such as
fragmentation or by producing gemmae.
➢ Example: Marchantia produces gemmae in gemma cups.
4. Reproduction in Lower Plants
Gametophyte and Sporophyte Generations:
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