Class 9 CBSE physics deleted portion 2020 to 2021..
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Answers
CBSE Class 9 Science (086) - Deleted portion (Theory):
Unit I: Matter-Nature and Behaviour
Chapter
Topics
Matter in Our Surroundings
Definition of matter; solid, liquid and gas; characteristics - shape, volume, density; change of state-melting (absorption of heat), freezing, evaporation (cooling by evaporation), condensation, sublimation.
Unit II: Organization in the Living World
Chapter
Topics
Diversity in Living Organisms
Diversity of plants and animals-basic issues in scientific naming, basis of classification. Hierarchy of categories / groups, Major groups of plants (salient features) (Bacteria, Thallophyta, Bryophyta, Pteridophyta, Gymnosperms and Angiosperms). Major groups of animals (salient features) (Non-chordates upto phyla and chordates upto classes).
Unit III: Motion, Force and Work
Chapter
Topics
Floatation
Thrust and Pressure. Archimedes’ Principle; Buoyancy; Elementary idea of Relative Density.
Sound
Nature of sound and its propagation in various media, speed of sound, range of hearing in humans; ultrasound; reflection of sound; echo and SONAR. Structure of the Human Ear (Auditory aspect only).
Unit V: Food Production
Chapter
Topics
Improvement in Food Resources
Plant and animal breeding and selection for quality improvement and management; Use of fertilizers and manures; Protection from pests and diseases; Organic farming.
DELETED PRACTICALS
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.
Unit IV: Our Environment
Physical resources: Air, Water, Soil. Air for respiration, for combustion, for moderating temperatures; movements of air and its role in bringing rains across India. Air, water and soil pollution (brief introduction). Holes in ozone layer and the probable damages.
Bio-geo chemical cycles in nature: Water, Oxygen, Carbon and Nitrogen.
We have also provided below the revised CBSE Syllabus for Class 9 Science subject on the basis of which the internal assessment and the annual examination will be conducted:
Download CBSE Class 9 Science Revised Syllabus for 2020-2021
Also Check:
NCERT Book for CBSE Class 9 Science
NCERT Solutions for CBSE Class 9 Science
CBSE Class 9 Science Chapter-Wise Extra Questions for 2020-2021
CBSE Class 9 Science Chapter-wise MCQs & Answers for 2020-2021