Topics
Reproduction
Reproduction in Organisms
Sexual Reproduction in Flowering Plants
- Flower - a Fascinating Organ of Angiosperms
- Accessory Organs
- Essential Parts of Flower: Androecium
- Essential Parts of Flower: Gynoecium
- Sexual Reproduction in Plants
- Pre-fertilization in Plant: Structure and Events
- Structure and Development of Anther
- Transverse Section of Mature Anther (Microsporangium)
- Microspores and Pollen Grains
- Advantages and Disadvantages of Pollen Grains
- Structure and Development of Ovule
- Artificial Hybridization or Artificial Fertilization
- Self-pollination
- Cross-pollination
- Abiotic Agents
- Biotic Agents
- Double Fertilization and Triple Fusion
- Post Fertilisation in Plant: Structures and Events
- Development of Seed
- Development of Fruit
Genetics and Evolution
Human Reproduction
- Microscopic Anatomy of Ovary
- Menstrual Cycle (Ovarian Cycle)
- Embryo Development Upto Blastocyst Formation
- Gametogenesis
- Fertilization in Human
- Implantation in Human
Biology and Human Welfare
Reproductive Health
Biotechnology and Its Applications
Ecology and Environment
Principles of Inheritance and Variation
- Introduction of Principles of Inheritance and Variation
- Terminology Related to Mendelism
- Mendel's Experiments on Inheritance
- Extensions of Mendelian Genetics (Deviation from Mendelism)
- Intragenic Interactions - Dominance
- Multiple Alleles
- Historical Development of Chromosome Theory
- Comparison Between Gene and Chromosome Behaviour
- Mendel's Laws > The Law of Segregation (Law of Purity of Gametes)
- Sex Determination in Some Insects
- Sex Determination in Birds
- Mendelian Genetics
- Chromosomal Disorders or Abnormalities
- Linkage and Crossing Over
Molecular Basis of Inheritance
Evolution
Human Health and Diseases
Strategies for Enhancement in Food Production
- Introduction of Strategies for Enhancement in Food Production
- Animal Husbandry (Livestock) > Animal Breeding
- Animal Husbandry (Livestock) > Pisciculture (Fish Farming)
- Plant Breeding
Microbes in Human Welfare
Biotechnology - Principles and Processes
- Biotechnology
- Principles of Biotechnology
- Tools of Recombinant DNA Technology
- Cloning Vectors
- Competent Host (For Transformation with Recombinant DNA)
- Processes of Recombinant DNA Technology
Biotechnology and Its Application
- Biotechnology
- Transgenic Animals
- Biosafety Issues
Organisms and Populations
Ecosystem
Biodiversity and Its Conservation
- Biodiversity
- Importance of Species Diversity to the Ecosystem
- Patterns of Biodiversity
- Loss of Biodiversity
- Endangered Organisms
- Extinction
Environmental Issues
- Environmental Issues
- Air Pollution
- Controlling Vehicular Air Pollution: a Case Study of Delhi
- Effects of Domestic Sewage and Industrial Effluents on Water
- Solid Wastes
- Radioactive Wastes
- Greenhouse Effect and Global Warming
- Ozone Depletion in the Stratosphere
- Degradation by Improper Resource Utilisation and Maintenance
- Radioactive Waste Management and E-waste
- Definition of Life Span
- Characteristics of the life span of Organisms
- Life span development
Definition
Life Span: The period from birth to the natural death of an organism represents its life span. It is possible to compute it by utilising the entity's average life span. It varies based on the individual and species and can last anywhere from a few minutes to several years. A specific entity's life span is determined by various genetic factors.
Characteristics of the life span of Organisms
- Life Span does not correlate with their sizes or shapes, the sizes of crows and parrots are not very different yet their life spans show a wide difference. Similarly, a mango tree has a much shorter life span as compared to a peepal tree.
- The death of every individual organism is a certainty. No individual is immortal, except for single-celled organisms.
Why do we say there is no natural death in single-celled organisms?
It is because there’s no dead body left, as the parent cell organism performs binary fission which results in two daughter single-celled organisms. Examples of unicellular organisms: Bacteria, Protozoa, Fungi (unicellular), Algae (unicellular), and Archaea.
Life span development
Lifespan evolution is scientific research that examines patterns of change, growth, and behavioural stability that occur across the lifespan of a species.
