CBSE Class 9 Deleted Portion of Syllabus for 2020-2021
CBSE had released a revised syllabus for Class 9 in 2020-2021 due to the COVID-19 pandemic and the subsequent disruptions in the academic calendar.
The deleted portion of the syllabus varied subject-wise and included certain topics or chapters that were deemed to be reduced in order to reduce the academic load on students. The deleted portions were meant to be covered in the subsequent academic year to ensure a smooth progression of the curriculum.
Students can find the complete detail of the deleted CBSE Class 9 Science syllabus of 2020-21 from the table below.
| Deleted Portion (Theory) |
| Under Unit I: Matter-Nature and Behaviour |
| Definition of matter: Matter refers to anything that occupies space and has mass. It can exist in the form of solid, liquid, or gas. Solid: Solid is a state of matter that has a definite shape, volume, and a high density. Particles in a solid are closely packed and have fixed positions. Solids do not flow and are not easily compressible. Liquid: Liquid is a state of matter that has a definite volume but takes the shape of the container it occupies. Liquids have a lower density compared to solids. Particles in a liquid are loosely packed and can move past each other, allowing liquids to flow and take the shape of their container. Gas: Gas is a state of matter that has no fixed shape or volume. Gases have the highest density among the three states of matter. Particles in a gas are far apart and move randomly. Change of state: Matter can undergo changes in state, such as melting, freezing, evaporation, condensation, and sublimation. Melting: Melting is the change of state from solid to liquid by absorbing heat energy. It results in the particles in a solid gaining enough energy to overcome their attractive forces and start moving more freely. Freezing: Freezing is the change of state from liquid to solid by losing heat energy. It results in the particles in a liquid losing energy and slowing down, eventually forming a fixed arrangement in a solid state. Evaporation: Evaporation is the change of state from liquid to gas by the process of vaporization. It occurs when the particles in a liquid gain enough energy to break their intermolecular forces and escape into the air as vapor, resulting in cooling of the liquid. Condensation: Condensation is the change of state from gas to liquid by losing heat energy. It occurs when the particles in a gas lose energy and come closer together, forming liquid droplets. Sublimation: Sublimation is the change of state from solid directly to gas without passing through the liquid state. It occurs when the particles in a solid gain enough energy to overcome their attractive forces and escape into the air as vapor. |
| Under Unit II:Organization in the Living World |
| Diversity of Plants and Animals: Basic Issues in Scientific Naming and Basis of Classification Scientific naming, also known as nomenclature, is a system of naming organisms using standardized rules to avoid confusion and establish a universal way of identifying and classifying living organisms. The basis of classification involves grouping organisms based on their characteristics and evolutionary relationships. Hierarchy of Categories/Groups: The classification of living organisms follows a hierarchical system with various categories or groups. The basic hierarchy of categories, from the highest to the lowest, includes: Kingdom Phylum (in case of animals) / Division (in case of plants) Class Order Family Genus Species Major Groups of Plants (Salient Features): Bacteria: Bacteria are unicellular prokaryotic organisms with a simple cellular structure and lack a true nucleus. They can be found in various habitats and have diverse shapes and modes of nutrition. Thallophyta: Thallophyta are plant-like organisms that lack true roots, stems, and leaves. They include algae and fungi, which can be either unicellular or multicellular. They reproduce through spores and have a simple body organization. Bryophyta: Bryophyta are non-vascular plants that include mosses, liverworts, and hornworts. They have a simple plant body with no true roots, stems, or leaves. They reproduce through spores and require a moist environment for survival. Pteridophyta: Pteridophyta are vascular plants that include ferns and fern allies. They have well-developed roots, stems, and leaves, and reproduce through spores. They require a moist environment for reproduction and growth. Gymnosperms: Gymnosperms are seed-producing plants that do not have flowers. They have naked seeds that are exposed on the surface of cone scales. Gymnosperms include plants like conifers, cycads, and ginkgoes. Angiosperms: Angiosperms are seed-producing plants that have flowers and enclosed seeds. They are the most diverse group of plants and include all flowering plants. Angiosperms can be further classified into monocots and dicots based on the number of cotyledons (seed leaves) and other characteristics. Major Groups of Animals (Salient Features): Non-chordates (up to Phyla): Non-chordates are animals that do not possess a notochord, which is a flexible rod-like structure found in chordates. Non-chordates include a wide variety of animals such as sponges, cnidarians (e.g., jellyfish, corals), mollusks (e.g., snails, clams), arthropods (e.g., insects, crustaceans), echinoderms (e.g., starfish, sea urchins), and many others. Chordates (up to Classes): Chordates are animals that possess a notochord at some stage of their life cycle. Chordates include animals like fishes, amphibians, reptiles, birds, and mammals. They have a well-defined body plan with a dorsal notochord, hollow nerve cord, pharyngeal slits, and a post-anal tail. Chordates are further classified into different classes based on their characteristics and evolutionary relationships, such as Agnatha (jawless fishes), Chondrichthyes (cartilaginous fishes), Osteichthyes (bony fishes), Amphibia (amphibians), Reptilia (reptiles), Aves (birds), and Mammalia (mammals). |
| Under Unit III: Motion, Force and Work |
| Floatation: Concept of buoyant force, thrust and pressure in fluids. Archimedes’ Principle and its applications. Introduction to the concept of relative density. Sound: Nature of sound and its propagation in different mediums. Speed of sound and its relation with temperature and pressure. Range of hearing in humans and characteristics of sound waves. Ultrasound and its applications. Reflection of sound, echo, and their applications. Introduction to SONAR and its working principle. Structure of the Human Ear: The auditory aspect of the human ear, including the structure and function of the outer, middle and inner ear. |
| Under Unit V: Food Production |
| Enhancing Food Resources: Advancements in Plant and Animal Breeding, Quality Management, Fertilization and Manure Usage, Pest and Disease Control, and Organic Farming. |
| Theme: Natural Resources: Balance in nature Unit IV: Our Environment |
| Physical Resources: Air, Water, and Soil – Their Roles and Impact on the Environment. Air for respiration, combustion, and climate regulation; Importance of air movements in monsoons in India. Pollution of air, water, and soil (brief overview). Depletion of ozone layer and potential consequences. Biogeochemical cycles in nature: Water, Oxygen, Carbon, and Nitrogen cycles. |
DELETED PRACTICALS
The following topics were part of the CBSE Class 9 syllabus for the academic year 2020-2021, but were included in the deleted portion of the syllabus:
- Separation of the components of a mixture of sand, common salt, and ammonium chloride (or camphor).
- Determination of the melting point of ice and the boiling point of water.
- Verification of the Laws of reflection of sound.
- Determination of the speed of a pulse propagated through a stretched string/slinky (helical spring).
- Study of the characteristics of Spirogyra, Agaricus, Moss, Fern, Pinus (either with male or female cone), and an Angiospermic plant. Draw and give two identifying features of the groups they belong to.
- Observe the given pictures/charts/models of earthworm, cockroach, bony fish, and bird. For each organism, draw their picture and record: a) one specific feature of its phylum. b) one adaptive feature with reference to its habitat.
- Study of the external features of root, stem, leaf, and flower of monocot and dicot plants.
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