Q: Define work.

A: Work is done when a force causes displacement in its direction.

Q: What is an acid?

A: An acid is a substance that produces hydrogen ions in aqueous solution.

Q: What is mitosis?

A: Mitosis is a type of cell division resulting in two identical cells.

Q: What was the First World War?

A: The First World War was a global conflict fought between 1914 and 1918.

Q: What is soil erosion?

A: Soil erosion is the removal of the top layer of soil by wind or water.

Q: Define work.

A: Work is done when a force causes displacement in the direction of the force.

Q: What is an acid?

A: An acid is a substance that produces hydrogen ions in solution.

Q: What is mitosis?

A: Mitosis is a type of cell division that results in two identical cells.

Q: What was the First World War?

A: It was a global war fought between 1914 and 1918.

Q: What is power?

A: Power is the rate of doing work.

Q: Define base.

A: A base is a substance that produces hydroxide ions in solution.

Q: What is meiosis?

A: Meiosis is a type of cell division that produces four haploid cells.

Q: What is natural vegetation?

A: Natural vegetation refers to plants that grow naturally without human interference.

Q: Who was Mahatma Gandhi?

A: Mahatma Gandhi was a leader of India's freedom struggle.

Q: What is electric energy?

A: Electric energy is the energy derived from electric current.

Q: Define salt.

A: A salt is formed when an acid reacts with a base.

Q: What is photosynthesis equation?

A: Carbon dioxide and water combine in presence of sunlight to form glucose and oxygen.

Q: What is irrigation?

A: Irrigation is the artificial supply of water to crops.

Q: What is nationalism?

A: Nationalism is a feeling of love and devotion towards one's nation.

Q: What is electric current? (Q317)

A: Electric current is the flow of electric charge.

Q: What is electrolysis? (Q318)

A: Electrolysis is the chemical decomposition using electricity.

Q: Define transpiration. (Q319)

A: Transpiration is the loss of water from plant leaves.

Q: Define quadratic equation. (Q320)

A: A quadratic equation is an equation of degree two.

Q: What is power? (Q417)

A: Power is the rate of doing work.

Q: Define corrosion. (Q418)

A: Corrosion is the gradual destruction of metals by chemical reaction.

Q: What is heredity? (Q419)

A: Heredity is the transfer of traits from parents to offspring.

Q: Define statistics. (Q420)

A: Statistics deals with collection and analysis of data.