Chapter: Life Sciences
Which of the following statements about livingand non–living being is/are correct?
1. While living being can demonstrate growthand repair, non–living being cannot
2. While living being demonstrates metabolicprocesses, non–living being does not.
Select the correct answer using the code givenbelow.
Living beings are characterized by growth, repair, and metabolic processes, which distinguish them from non-living entities. This vital distinction underpins the definition of life.
1. Growth and Repair: Living organisms grow and repair through cellular processes. This is evident in cell division, where cells multiply to increase organism size or replace damaged cells. Non-living beings, on the other hand, do not have this inherent capability; any accumulation of material is surface-level and does not represent true growth.
2. Metabolism: Living beings engage in chemical reactions, termed metabolic processes, which include anabolism (building up molecules) and catabolism (breaking down molecules for energy). Non-living beings lack these distinct biochemical reactions, as they do not sustain life.
Option 1: True - living beings grow and repair themselves, while non-living do not.
Option 2: True - metabolic processes are exclusive to living beings.
Remember: "GREM" - Growth, Repair, Energy (Metabolism) defines life!
A diagram illustrating metabolic pathways in living organisms versus a visual of accumulation on non-living surfaces could enhance understanding of these concepts.
Verified against NCERT Class XI Biology, Chapter 1 (Diversity in Living World).
Which one of the following structures or components is not always present in living cells ?
The cell wall is a rigid structure that provides support and protection. It is composed mainly of cellulose in plants.
The following components are universally found in living cells:
Remember: "Every Cell Has Genetics, Cytoplasm, and Membrane" (ECHGCM) to recall universal cell components.
Illustrate a diagram contrasting plant and animal cells, highlighting the presence of the cell wall in plants and absence in animal cells.
Verified against NCERT Class XI Biology, Chapter 3 (Cell Structure and Function).
Which one of the following organisms represents the primary consumer category in an ecosystem ?
In an ecosystem, organisms are categorized by their role in the food chain. Primary consumers are those that directly consume producers (plants). The caterpillar exemplifies this role by feeding on leaves.
The caterpillar, as a larval stage of many butterflies and moths, primarily eats leaves, thus obtaining energy directly from the producer level of the ecosystem. This classification is crucial in understanding ecological dynamics and food chain interactions.
Remember: "Caterpillar Crawls, Consuming Crops" – a simple mnemonic to recall that caterpillars are primary consumers.
Verified against NCERT Class 11 Biology, Chapter on Ecology and Ecosystems.
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