Questions
~2 questions per paper
Difficulty
Easy
Importance
High yield for CTET/TET EVS section
Overview
The 'Animals & Plants' module covers the foundational biological classification, structural characteristics, and environmental interactions of living organisms. It is a high-yield topic in CTET and state TET exams, focusing on the distinction between biotic and abiotic factors and the survival mechanisms of flora and fauna. Mastery of this section is essential for answering core EVS (Environmental Studies) questions that link biological traits to ecological roles.
Living vs Non-Living Things
Living things are defined by specific life processes such as growth, respiration, excretion, reproduction, and irritability (response to stimuli). Non-living things lack these self-sustaining biological functions and do not exhibit independent mobility or cellular organization.
- Respiration: Exchange of gases to produce energy (ATP).
- Homeostasis: Maintaining stable internal environment.
- Reproduction: Essential for species continuity.
- Irritability: Sensitivity and response to external stimuli.
- Metabolism: Sum of all chemical reactions in cells.
Basic Plant Biology
Plants are autotrophic organisms that synthesize food via photosynthesis using chlorophyll, sunlight, water, and CO2. They are categorized based on their life cycle and structural complexity, including herbs, shrubs, and trees.
- Photosynthesis: 6CO2 + 6H2O -> C6H12O6 + 6O2.
- Xylem: Transports water from roots to leaves.
- Phloem: Transports synthesized food to plant parts.
- Stomata: Microscopic pores for gas exchange.
- Transpiration: Evaporation of water from leaf surfaces.
Animal Kingdom & Adaptations
Animals are heterotrophic, multi-cellular organisms categorized by their skeletal structure (vertebrates vs. invertebrates) and habitats. Adaptations are physiological or behavioral modifications that enable survival in extreme environments like deserts, polar regions, or aquatic systems.
- Vertebrates: Presence of a backbone or spinal column.
- Invertebrates: Absence of an internal bony skeleton.
- Camouflage: Ability to blend into surroundings to escape predators.
- Hibernation: Seasonal dormancy to survive low temperatures.
- Aestivation: Summer dormancy in hot, dry environments.
Ecological Interactions
This subtopic explores how animals and plants interact within an ecosystem to maintain environmental balance. It covers food chains, food webs, and the symbiotic relationships that define survival strategies in nature.
- Producers: Green plants (autotrophs).
- Consumers: Organisms dependent on producers (herbivores/carnivores).
- Decomposers: Fungi and bacteria breaking down organic matter.
- Symbiosis: Mutualistic or parasitic relationship between species.
- Energy Flow: Only 10 percent energy reaches next trophic level.
Exam Tip
Focus on the functional differences between xylem and phloem and the specific adaptive features of desert plants (xerophytes), as these appear frequently in matching-type questions.
Common Mistakes
- Confusing 'respiration' only with 'breathing' (respiration occurs in plants even without lungs).
- Misidentifying non-living objects that show movement, like clouds or water currents, as living things.
- Ignoring the role of decomposers in nutrient cycling within an ecosystem.
More Revision Notes
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