Class 9 Science
A year along the chapter spine of NCERT's Exploration: the cell and the tissues built from it, motion described in words, graphs and equations, mixtures and how to pull them apart, forces and the three laws, work and energy, the inside of the atom and the way atoms combine, sound as a wave, how life continues from one generation to the next, and how the whole of that diversity is sorted out.
Print the whole term as one worksheet pack →Cells and Tissues
- The cell and what is inside itLesson
Name the parts of a plant and an animal cell and say what each does, tell a prokaryotic cell from a eukaryotic one, and use osmosis to explain what happens to a cell in salty water.
- Plant and animal tissuesLesson
Name the three meristems and the permanent tissues they become, match each plant and animal tissue to its job, and tell the joints and muscle types apart by what they do.
Describing Motion
- Distance, displacement, speed and velocityLesson
Separate distance from displacement and speed from velocity, work out average speed, average velocity and average acceleration, and say what stays fixed in uniform circular motion.
- Motion graphs and the kinematic equationsLesson
Read velocity off the slope of a position-time graph and displacement off the area under a velocity-time graph, and use v = u + at, s = ut + ½at² and v² = u² + 2as.
Mixtures and their Separation
Forces, Work and Energy
- Force and Newton's three lawsLesson
Add forces to find the net force, use F = ma and F = mg, say what Newton's three laws claim, and treat two connected objects as one system.
- Work, energy and powerLesson
Work out work done, kinetic energy, potential energy and power, say when work is positive, negative or zero, and explain what a pulley, a ramp and a lever actually change.
Atoms and Molecules
- Inside the atomLesson
Count protons, neutrons and electrons from an atomic number and a mass number, fill the shells and read off a valency, and say what makes two atoms isotopes.
- How atoms combine, and what a molecule weighsLesson
Use the laws of conservation of mass and of constant proportions, tell a covalent bond from an ionic one, write a formula by crossing over valencies, and add up a molecular or formula unit mass.
Sound
Life Continuing, and Life's Variety
- Reproduction: how life continuesLesson
Tell asexual reproduction from sexual, name the parts of a flower and follow pollen through to a seed, and describe fertilisation and the reproductive cycle in animals and humans.
- Diversity and classificationLesson
Place an organism in one of the five kingdoms, run the hierarchy from kingdom down to species, and read and write a scientific name in the binomial system.