How do greenhouses keep plants warm?

Answer: Glass traps heat from sunlight inside

Glass traps heat from sunlight inside ✓ — Correct! Sunlight passes through glass and warms the interior. The warm surfaces radiate infrared heat, which can't escape easily through glass. This 'greenhouse effect' creates a warm environment for growing plants year-round.

Green color absorbs more energy — Wrong. Greenhouses are usually clear, not green. The name comes from growing green plants, not the structure's color. They work by trapping heat inside.

Walls filter sunlight into pure light — Wrong. Greenhouses don't filter or purify light. They allow full-spectrum sunlight in while trapping the resulting heat energy.