GCSE GCSE Combined Science

Question 1

What is the equation for photosynthesis?

Accepted Answer

6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

Answer

The balanced equation for photosynthesis is: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂ (using light energy). Plants use carbon dioxide and water to produce glucose and oxygen.

Question 2

What is the difference between mitosis and meiosis?

Accepted Answer

Mitosis produces 2 identical daughter cells (for growth/repair); meiosis produces 4 genetically unique gametes (for reproduction)

Answer

Mitosis produces 2 genetically identical diploid cells (same number of chromosomes as parent) for growth, repair, and asexual reproduction. Meiosis produces 4 genetically unique haploid cells (gametes) for sexual reproduction.

Question 3

What is Newton's Second Law of Motion?

Accepted Answer

Force = mass × acceleration (F = ma)

Answer

Newton's Second Law states that the resultant force acting on an object equals its mass multiplied by its acceleration: F = ma. The greater the force or the smaller the mass, the greater the acceleration.

Question 4

What is an ionic bond?

Accepted Answer

A bond formed by transferring electrons from a metal to a non-metal, creating oppositely charged ions

Answer

An ionic bond forms when a metal atom transfers electrons to a non-metal atom. This creates positive metal ions and negative non-metal ions, which are held together by electrostatic attraction.

Question 5

What is the relationship between frequency, wavelength, and wave speed?

Accepted Answer

Speed = frequency × wavelength

Answer

Wave speed = frequency × wavelength (v = fλ). This applies to all waves — light, sound, and water waves. Rearranged: f = v/λ or λ = v/f.

GCSE Revision Practice Test

GCSE Revision Practice Test

GCSE GCSE Combined Science