The correct option is (iii). Frequency measures complete oscillations per second; higher frequency increases the count of compressions passing a fixed point each second while shortening wavelength and time period. CBSE Class 9 Science Chapter 10 Sound Waves Characteristics and Applications ...
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The farmer should use vegetative propagation techniques like stem cuttings, layering or plant tissue culture. These methods reproduce plants rapidly from somatic tissues while ensuring identical, desirable parental traits. Class 9 Science Exploration New Book All Chapter Solution Revise, Reflect, Refine Chapter ...
Exclusive self-pollination severely diminishes genetic diversity across successive generations by endlessly recycling the same genes, limiting new character combinations and reducing the species ability to adapt to changing environmental conditions. Chapter 11 Reproduction How Life Continues Solutions Class 9 Science Reproduction How ...
Vegetatively propagated plants are genetically identical clones. Because they lack genetic diversity, any pathogen, pest or environmental change capable of harming one individual can rapidly wipe out the entire crop. CBSE Class 9 Science Chapter 11 Reproduction How Life Continues Solutions NCERT ...
(i) No, ~150 pages cover roughly 7.5 m², whereas a standard classroom floor is around 40 to 50 m². (ii) Storeroom volume is 9,000 cu ft (~255 m³); dividing by textbook volume (~0.0006 m³) fits roughly 350,000 to 400,000 books. Cbse ...