Combined Science Flashcards

What is meant by 'adaptation' in biology?

Answer: A feature of an organism that helps it survive and reproduce in its environment

An adaptation is a feature (structural, behavioural, or physiological) that improves an organism's chances of survival and reproduction in its particular environment.

What type of reaction produces a precipitate?

Answer: A reaction where an insoluble solid forms from mixing two solutions

A precipitate is an insoluble solid formed when two solutions are mixed. For example, mixing lead nitrate and sodium iodide solutions produces a yellow precipitate of lead iodide.

What is the speed of light in a vacuum?

Answer: 3 × 10⁸ m/s

The speed of light in a vacuum is approximately 3 × 10⁸ m/s (300,000,000 m/s or 300,000 km/s).

In photosynthesis, what does the plant produce?

Answer: Oxygen and glucose

Photosynthesis: CO₂ + H₂O + light energy → glucose + O₂. Plants produce glucose (food) and oxygen as a by-product.

What is the difference between mass and weight?

Answer: Mass is the amount of matter in an object (kg); weight is the gravitational force on an object (N)

Mass is the amount of matter in an object, measured in kg — it stays constant anywhere. Weight is the gravitational force on an object (W = mg), measured in Newtons, and varies with gravity.

What is a food web?

Answer: A network of interconnected food chains showing feeding relationships in an ecosystem

A food web shows the complex feeding relationships in an ecosystem, with multiple interconnected food chains. It is more realistic than a single food chain.