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Plant kingdom
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Class 11
The Living World Biological Classification Plant Kingdom Animal Kingdom Morphology of Flowering Plants Anatomy of Flowering Plants Structural Organisation in Animals Cell: The Unit of Life Biomolecules Cell Cycle and Cell Division Photosynthesis Respiration in Plants Plant Growth and Development Body Fluids and Circulation Breathing and Exchange of Gases Excretory Products Locomotion and Movement Neural Control Chemical Coordination
Class 12
Sexual Reproduction in Flowering Plants Human Reproduction Reproductive Health Principles of Inheritance Molecular Basis of Inheritance Evolution Human Health and Diseases Microbes in Human Welfare Biotechnology Principles Biotechnology Applications Organisms and Populations Ecosystem Biodiversity and Conservation

Lessons

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LIFE CYCLE OF GYMNOSPERMS

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The life cycle of gymnosperms begins with seed germination, producing a diploid sporophyte that differentiates into roots, stems, and leaves. Specialized leaves form sporophylls grouped into cones. Male cones produce microspores, developing into pollen grains, while female cones generate megaspores, forming gametophytes with eggs. Pollination, typically wind-facilitated, leads to fertilization within the ovule. The resulting zygote matures into a seed, completing the cycle.

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LIFE CYCLE OF PTERIDOPHYTES

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Pteridophytes, also known as vascular amphibians, exhibit a diplo-haplontic life cycle, where the dominant sporophyte is well-differentiated with true roots, stems, and leaves, while the reduced gametophyte is heart-shaped and photosynthetic.

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LIFE CYCLE OF BRYOPHYTES

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The life cycle of bryophytes involves alternation of generations between the dominant gametophyte and the sporophyte. The gametophyte produces gametes that unite to form a sporophyte, which generates spores. These spores develop into new gametophytes, ensuring the perpetuation and propagation of bryophyte species through this cyclical process.

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GYMNOSPERMS – FEATURES

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Gymnosperms are seed-producing plants with naked seeds, not enclosed by fruit. They include conifers like pine and cedar, thriving in diverse habitats. Key features: needle-like leaves, cones for reproduction, and adaptability to various climates.

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