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Endosymbiotic Theory – Origin of the eukaryotic cell

Endosymbiotic Theory - Origin of the eukaryotic cell

What is Endosymbiotic Theory? Definition of Endosymbiotic Theory The Endosymbiotic Theory posits that certain organelles in eukaryotic cells, specifically mitochondria and chloroplasts, originated from free-living prokaryotic cells that were engulfed by ancestral eukaryotic cells, leading to a mutually beneficial symbiotic relationship. Origin of the eukaryotic cell 1. Gene Trees and the Complexity of Eukaryotic Origins … Read more

Domain – Definition, Development, Importance, Examples

Domain - Definition, Development, Importance, Examples

What is Domain? Definition of Domain In biology, a domain is the highest taxonomic rank used to categorize and group organisms based on shared characteristics and evolutionary history. Domain in the Tree of Life Development of the Domain System The conception and evolution of the domain system, a fundamental framework for the classification of life, … Read more

3 Domains of Life – Bacteria, Archaea, Eukarya

Carl Woese’s Classification - Three Domain Classification

What is 3 Domains of Life? The intricate tapestry of life, as we understand it today, is a culmination of extensive scientific research and discoveries. Historically, the living world was bifurcated into two primary domains: Eukaryotes (Eukarya) and Prokaryotes (Bacteria). This classification was rooted in microscopic observations, particularly the presence or absence of membrane-bound nuclei … Read more

Controlled Experiment – Definition, Process, Importance, Examples

Controlled Experiment - Definition, Process, Importance, Examples

What is Controlled Experiment? Definition of Controlled Experiment A controlled experiment is a scientific investigation in which a researcher deliberately manipulates a specific variable, while keeping all other variables constant, to determine its effect on a system under study. How Does Controlled Experiment Works? A controlled experiment works by systematically testing a hypothesis through the … Read more

Feedback Mechanism – Definition, Types, Mechanism, Examples

Feedback Mechanism - Definition, Types, Mechanism, Examples

What is Feedback mechanism? Definition of Feedback mechanism A feedback mechanism is a regulatory system within a process or organism that responds to changes by either amplifying (positive feedback) or counteracting (negative feedback) them to maintain equilibrium or homeostasis. Open and Closed-Loop Feedback Mechanisms Feedback loops are integral components in the maintenance of homeostasis within … Read more

Motility – Definition, Types, Importance, Examples

Motility - Definition, Types, Importance, Examples

What is Motility? Definition of Motility Motility refers to the ability of an organism or cell to move autonomously by utilizing metabolic energy. Types of Motility Motility, a fundamental biological phenomenon, is exhibited through various mechanisms across different organisms. The mechanisms underlying motility are intricate, reflecting the evolutionary adaptations of organisms to their environments. Here, … Read more

Microorganism – Definition, Types, Importance, Examples

Microorganism - Definition, Types, Importance, Examples

What is Microorganism? Definition of Microorganism A microorganism, or microbe, is a tiny living organism that is invisible to the naked eye and can exist as single-celled entities or colonies of cells. Discovery of Microorganisms Microorganisms, despite their minuscule size, have had a profound impact on our understanding of life and disease. The journey of … Read more

Microevolution – Definition, Causes, Examples

Microevolution - Definition, Causes, Examples

What is Microevolution? Definition of Microevolution Microevolution refers to small-scale changes in allele frequencies within a population over a relatively short period of time, driven by mechanisms such as mutation, selection, gene flow, and genetic drift. Causes of Microevolution 1. Mutation 2. Selection 3. Genetic drift 4. Gene flow Difference between microevolution and macroevolution Microevolution … Read more

Histology – Definition, Methods, Careers, Importance

Histology - Definition, Methods, Careers, Importance

What is Histology? Definition of Histology Histology is the scientific study of the microscopic structure of biological tissues. Sample preparation Methods in Histology Histological analysis necessitates meticulous sample preparation to ensure accurate microscopic observation. The preparation techniques vary based on the specimen type and the intended observation method. Herein, we delineate the primary steps involved … Read more

Osmotic Pressure – Definition, Equations, Types, Importance, Examples

Osmotic Pressure - Definition, Equations, Types, Importance, Examples

What is Osmotic Pressure? Definition of Osmotic Pressure Osmotic pressure is the force required to prevent the flow of solvent molecules through a semi-permeable membrane due to differences in solute concentrations between two solutions. Osmotic Pressure Equation Osmotic pressure, a fundamental concept in the study of solutions, can be quantitatively described using a specific equation. … Read more

Both gymnosperms and angiosperms bear seeds, then why are they classified separately?

Both gymnosperms and angiosperms bear seeds, then why are they classified separately?

Write a note on economic importance of algae and gymnosperms.

Write a note on economic importance of algae and gymnosperms.

Mention the ploidy of the following: protonemal cell of a moss; primary endosperm nucleus in dicot; leaf cell of a moss; prothallus cell of a fern; gemma cell in Marchantia; meristem cell of monocot; ovum of a liverwort; and zygote of a fern.

Mention the ploidy of the following: protonemal cell of a moss; primary endosperm nucleus in dicot; leaf cell of a moss; prothallus cell of a fern; gemma cell in Marchantia; meristem cell of monocot; ovum of a liverwort; and zygote of a fern.

Name three groups of plants that bear archegonia. Briefly describe the life cycle of any one of them.

Name three groups of plants that bear archegonia. Briefly describe the life cycle of any one of them.

When and where does reduction division take place in the life cycle of a liverwort, a moss, a fern, a gymnosperm, and an angiosperm?

When and where does reduction division take place in the life cycle of a liverwort, a moss, a fern, a gymnosperm, and an angiosperm?

What is heterospory? Briefly comment on its significance. Give two examples.

What is heterospory? Briefly comment on its significance. Give two examples.

Explain briefly the following terms with suitable examples: (i) protonema (ii) antheridium (iii) archegonium (iv) diplontic (v) sporophyll (vi) isogamy

Explain briefly the following terms with suitable examples: (i) protonema (ii) antheridium (iii) archegonium (iv) diplontic (v) sporophyll (vi) isogamy

Differentiate between the following: (i) red algae and brown algae (ii) liverworts and moss (iii) homosporous and heterosporous pteridophyte

Differentiate between the following: (i) red algae and brown algae (ii) liverworts and moss (iii) homosporous and heterosporous pteridophyte

Match the following (column I with column II) (a) Chlamydomonas (b) Cycas (c) Selaginella (d) Sphagnum

Match the following (column I with column II) (a) Chlamydomonas (b) Cycas (c) Selaginella (d) Sphagnum

Describe the important characteristics of gymnosperms.

Describe the important characteristics of gymnosperms.

What is the basis of classification of algae?

What is the basis of classification of algae?

what is the energy released by the organic compound mostly used to do

what is the energy released by the organic compound mostly used to do

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