Living and Non-living Things

Overview

Living and Non-living Things forms the foundational chapter in life sciences for Varg-2 (upper-primary) level of MP TET. This topic establishes the basic criteria that distinguish life from non-life and introduces the systematic classification of living organisms—a concept that recurs throughout biology.

For MP TET, expect questions testing your ability to identify characteristics of living things, differentiate them from non-living objects, and classify organisms into major groups. The topic also connects to environmental studies and ecology, making it essential for understanding food chains, ecosystems, and biodiversity covered elsewhere in the syllabus.

Mastering this topic requires clarity on the seven life processes (MRS GREN or similar mnemonics), understanding the five-kingdom classification system, and recognising examples from the local MP environment—forests, tribal areas, and agricultural zones rich in biodiversity.

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Key Concepts

• **Living things** possess specific characteristics that distinguish them from non-living things: they grow, reproduce, respire, respond to stimuli, excrete, require nutrition, and move (at least at the cellular level).

• **Non-living things** lack these life processes; they may show some superficial similarities (a car moves, fire grows) but do not exhibit all characteristics together.

• **Growth in living things** is internal and irreversible (cells multiply), whereas non-living things grow externally by accumulation (a snowball gets bigger by adding snow).

• **Cellular organisation** is the structural basis of life—all living things are made of one or more cells; non-living things lack cells.

• **Metabolism** (sum of all chemical reactions) occurs only in living organisms; it includes anabolism (building up) and catabolism (breaking down).

• **Classification** is the systematic arrangement of organisms into groups based on similarities and differences, making study and identification easier.

• **Five-Kingdom Classification** (Whittaker, 1969) divides all living organisms into Monera, Protista, Fungi, Plantae, and Animalia based on cell structure, mode of nutrition, and body organisation.

• **Binomial nomenclature** (two-part scientific name) ensures universal naming—genus + species (e.g., *Homo sapiens* for humans).

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Key Facts and Definitions

| Term | Definition / Fact | |------|-------------------| | **MRS GREN** | Mnemonic for life processes: Movement, Respiration, Sensitivity, Growth, Reproduction, Excretion, Nutrition | | **Cell** | Basic structural and functional unit of life; discovered by Robert Hooke (1665) | | **Unicellular** | Organisms made of a single cell (e.g., Amoeba, Paramecium, bacteria) | | **Multicellular** | Organisms made of many cells with division of labour (e.g., humans, mango tree) | | **Autotrophs** | Organisms that prepare their own food (plants, some bacteria) | | **Heterotrophs** | Organisms that depend on others for food (animals, fungi) | | **Monera** | Prokaryotic, unicellular organisms lacking a true nucleus (bacteria, blue-green algae) | | **Protista** | Eukaryotic, mostly unicellular organisms (Amoeba, Paramecium, Euglena) | | **Fungi** | Eukaryotic, mostly multicellular, saprophytic or parasitic (mushroom, yeast, mould) | | **Plantae** | Eukaryotic, multicellular, autotrophic organisms with cell walls (all green plants) | | **Animalia** | Eukaryotic, multicellular, heterotrophic organisms without cell walls (all animals) | | **Virus** | Non-cellular entity; shows living characteristics only inside a host cell; neither living nor non-living (e.g., COVID-19 virus, tobacco mosaic virus) |