O-Level Combined Science — Biology

Question 1

What is the basic unit of life?

Accepted Answer

Cell

Answer

Organ

Answer

Tissue

Answer

Organism

Question 2

Which organelle is responsible for producing energy (ATP) in the cell?

Accepted Answer

Mitochondria

Answer

Nucleus

Answer

Ribosome

Answer

Vacuole

Question 3

What is the process by which plants make their own food?

Accepted Answer

Photosynthesis

Answer

Respiration

Answer

Digestion

Answer

Fermentation

Question 4

Which blood cells are responsible for fighting infection?

Accepted Answer

White blood cells

Answer

Red blood cells

Answer

Platelets

Answer

Plasma cells

Question 5

What is the word equation for aerobic respiration?

Accepted Answer

Glucose + oxygen → carbon dioxide + water + energy

Answer

Glucose → carbon dioxide + water

Answer

Glucose + water → oxygen + energy

Answer

Carbon dioxide + water → glucose + oxygen

Question 6

What is the function of chlorophyll?

Accepted Answer

To absorb sunlight for photosynthesis

Answer

To store water in the leaf

Answer

To transport minerals from the roots

Answer

To control gas exchange