AimMent

For Class 8, 9 & 10

Foundation - a strong base in Physics, Chemistry, Maths & Biology

Concept-first questions with clear model answers across all four subjects, aligned to NCERT. Start early, build the habit, and walk into your board exams, NEET and JEE already ahead.

Class 824Class 924Class 1036
SubjectAllPhysics 19Chemistry 19Biology 19Mathematics 27
ChapterAllAlgebraic Expressions and IdentitiesCell Structure and FunctionsChemical Effects of Electric CurrentCoal and PetroleumCombustion and FlameComparing QuantitiesConservation of Plants and AnimalsCrop Production and ManagementExponents and PowersForce and PressureFrictionLightLinear Equations in One VariableMaterials: Metals and Non-MetalsMensurationMicroorganisms: Friend and FoePollution of Air and WaterReaching the Age of AdolescenceReproduction in AnimalsSome Natural PhenomenaSoundSquares and Square RootsSynthetic Fibres and Plastics

Showing 1 question for Class 8. Tap a card to reveal the answer.

BiologyMicroorganisms: Friend and Foeeasy

Name two useful and two harmful micro-organisms and state what they do.

Reveal answer ↓

What it is

Microbes are tiny living things that can help us (curd, bread, medicine) or harm us (disease).

Answer

Useful: yeast is used to make bread and in brewing (fermentation), and Lactobacillus bacteria turn milk into curd. Harmful: the bacterium that causes tuberculosis, and the Plasmodium protozoan that causes malaria. So micro-organisms can help or harm us depending on the type.

  • •Useful: yeast (bread, fermentation), Lactobacillus (curd)
  • •Harmful: TB bacteria, malaria (Plasmodium)
  • •Microbes can be helpful or disease-causing

Why learn this

They set your curd, raise your bread and cause colds - biology you meet every day.

💡 Memory trick

Friends Ferment (curd and bread); Foes cause Fever.