Biogeochemical Cycles (Nutrient Cycles) - Phosphorus Cycle

Topics

Reproduction in Lower and Higher Plants
Reproduction in Lower and Higher Animals
Inheritance and Variation
- Heredity
- Genes and Genetic
- Back Cross and Test Cross
- Deviations from Mendel’s Findings
- Chromosomal Theory of Inheritance
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- Human Genetic Disorders
- Exceptions to Mendel's Principles > Multiple alleles
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- Types of Linkage > Complete Linkage
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- Crossing Over
- Colour blindness
- Haemophilia
- Sex Determination in Birds
- Down's syndrome (Mongolian Idiocy)
- Turner's Syndrome
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- Overview of Inheritance and Variation
Molecular Basis of Inheritance
- Deoxyribonucleic Acid (DNA)
- Griffith’s Experiment
- Packaging of DNA Helix
- DNA Replication
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- Regulation of Gene Expression
- The Lac Operon
- Genomics
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- Overview of Molecular Basis of Inheritance
Origin and Evolution of Life
- Origin and Evolution of Universe and Earth
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- Chemical Evolution of Life (Self-assembly Theory of the Origin of Life)
- Darwin’s Theory of Natural Selection (Darwinism)
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- Overview of Origin and Evolution of Life
Plant Water Relation
- Plant Water Relation
- Properties of Water
- Water Available to Roots for Absorption
- Imbibition
- Diffusion
- Osmosis
- Osmotic Pressure
- Turgidity and Flaccidity (Plasmolysis)
- Passive Transport
- Water Potential (ψ)
- Concept of Transpiration
- Path of Water Across the Root
- Kinds of Transpiration
- Forces Contributing to Ascent of Sap
- Transport of Mineral Ions
- Structure of Stomatal Apparatus
- Significance of Transpiration
- Transportation of Food and Other Substances
- Overview of Plant Water Relation
Plant Growth and Mineral Nutrition
- Plant Growth
- Phases of Plant Growth
- Conditions Necessary for Plant Growth
- Plant Growth Rate
- Plant Growth Curve
- Differentiation, De-differentiation, Re- Differentiation
- Plant Development
- Plant Plasticity
- Plant Hormones
- Auxins
- Gibberellins
- Cytokinins
- Ethylene
- Abscisic Acid (ABA)
- Photoperiodism
- Vernalization (Yarovization)
- Plant Mineral Nutrition
- Nitrogen Cycle
- Overview of Plant Growth and Mineral Nutrition
Respiration and Circulation
- Cellular Respiration
- Organs of Respiratory Exchange
- Human Respiratory System
- Mechanism of respiration-Breathing
- Regulation of Breathing / Respiration
- Modified Respiratory Movements
- Disorders of Respiratory System
- Transportation in Living Organisms
- Circulation in Animals
- Types of Closed Circulation
- Blood Circulatory System
- Composition of Blood > Plasma (The Liquid Portion of Blood)
- Composition of Blood > Cellular Elements: Red Blood Cells (Erythrocytes)
- Composition of Blood > Cellular Elements: White Blood Cells (Leukocytes)
- Composition of Blood > Cellular Elements: Blood Platelets (Thrombocytes)
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- Working mechanism of human heart
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- Mechanism of respiration - External respiration
- Cellular Respiration
- Overview of Respiration and Circulation
Control and Co-ordination
- Control and Co-ordination
- Nervous System in Hydra
- Nervous System in Planaria (Flatworm)
- Neural Tissue
- Neuron (Or Nerve Cell)
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- Human Nervous System
- Central Nervous System (CNS)
- The Human Brain
- The Spinal Cord
- Peripheral Nervous System > Somatic Nervous System
- Sensory Receptors
- The Human Eye
- Human Ear
- Disorders of Nervous System
- Chemical Coordination
- Human Endocrine System
- The Hypothalamus
- Pituitary Gland or Hypophysis Gland
- The Pineal Gland
- Thyroid Gland
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- Adrenal Gland (Suprarenal Gland)
- Pancreas (Islets of Langerhans)
- Reproductive Glands (Gonads)
- Synapse
- Types of Synapse
- Transmission of Nerve Impulse
- Generation of nerve impulse
- Reflex Action
- Peripheral Nervous System > Autonomic Nervous System
- Diffuse Endocrine Glands
- Overview of Control and Co-ordination
Human Health and Diseases
- Defence System in Our Body: Immune System
- Structure of Antibody
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Human Reproduction
Enhancement of Food Production
- Improvement in Food Production
- Plant Breeding
- Tissue Culture
- Single Cell Protein (SCP)
- Biofortification
- Animal Husbandry (Livestock)
- Animal Husbandry (Livestock) > Animal Breeding
- Dairy (Livestock) Farm Management
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- Animal Husbandry (Livestock) > Apiculture (Bee Farming)
- Animal Husbandry (Livestock) > Pisciculture (Fish Farming)
- Sericulture
- Lac Culture
- Microbes in Human Welfare
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- Microbes in Sewage Treatment
- Microbes in Energy Generation
- Microbes as Biocontrol Agents
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Biotechnology
- Biotechnology
- Principles of Biotechnology
- Methodology for rDNA Technology
- Crop Biotechnology > Hybrid Seeds
- Bioethics
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- Overview of Biotechnology
Organisms and Populations
- Organisms and the Environment Around
- Habitat
- Niche
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- Population Interactions
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- Population Growth
- Positive Interactions > Mutualism (Symbiosis)
- Negative Interactions > Competition
- Negative Interactions > Parasitism
- Negative Interactions > Predation
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- Overview of Organisms and Populations
Ecosystems and Energy Flow
Biodiversity, Conservation and Environmental Issues
- Biodiversity
- Levels of Biodiversity
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- Loss of Biodiversity
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- Biological Diversity Act, 2002
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- Global Warming
- Preventive Measures of Global Warming
- Mission Harit Maharashtra
- Conservation of Biodiversity
- Overview of Biodiversity, Conservation and Environmental Issues

CISCE: Class 12

Key Points: Phosphorus Cycle

Phosphorus is an essential element of nucleic acids, ATP, proteins, bones, and teeth, and often acts as a limiting nutrient in ecosystems.
The main reservoir of phosphorus is phosphate-containing rocks, from which phosphates are released slowly by weathering.
Plants absorb phosphorus from soil as phosphate ions, which then pass through food chains to animals.
Phosphorus returns to the environment through excretion, decomposition, leaching, and sedimentation, but has no gaseous phase.
Human activities such as fertilizer use and sewage disposal increase phosphate levels, causing eutrophication in aquatic ecosystems.