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ICSE Class IX Mid-term 2024 : Assamese : English language

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SCIENCE (52) BIOLOGY SCIENCE Paper - 3 CLASS X There will be one written paper of two hours duration of 80 marks and Internal Assessment of practical work carrying 20 marks. 1. Basic Biology 2. Plant Physiology (i) Cell Cycle and Cell Division. Cell cycle Interphase (G 1 , S, G 2 ) and Mitotic phase. (i) Absorption by roots, imbibition, diffusion and osmosis; osmotic pressure, root pressure; turgidity and flaccidity; plasmolysis and deplasmolysis; the absorption of water and minerals; active and passive transport (in brief); The rise of water up to the xylem; Forces responsible for ascent of sap. Cell Division: Mitosis and its stages. A basic understanding of Meiosis as a reduction division (stages not required). A brief idea of homologous chromosomes and crossing over leading to variations. Significance and major differences between mitotic and meiotic division. Understanding of the processes related to absorption of water by the roots. Characteristics of roots, which make them suitable for absorbing water. Structure of a single full-grown root hair. A general idea of Cohesive, Adhesive forces and transpirational pull. Experiments to show the conduction of water through the xylem. (ii) Transpiration - process and significance. Ganong s potometer and its limitations. The factors affecting rate of transpiration. Experiments on transpiration. A brief idea of guttation and bleeding. (ii) Structure of chromosome. Basic structure of chromosome with elementary understanding of terms such as chromatin, chromatid, gene structure of DNA and centromere. (iii) Genetics: Mendel s laws of inheritance and sex-linked inheritance of diseases. The three laws of Mendel. Monohybrid cross phenotype and genotype. Dihybrid cross Only phenotype. The following terms to be covered: gene, allele, heterozygous, homozygous, dominant, recessive, mutation, variation, phenotype, genotype. Sex determination in human beings. Sex linked inheritance of diseases to include only X-linked like haemophilia and colour blindness. 1 Concept of transpiration and its importance to plants Experiments related to transpiration: (a) Loss in weight of a potted plant or a leafy shoot in a test tube as a result of transpiration. (b) Use of cobalt chloride paper to demonstrate unequal rate of transpiration in a dorsiventral leaf. Adaptations in plants to reduce transpiration. A brief idea of guttation and bleeding.

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ICSE Class IX Mid-term 2024 : Assamese : English language
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