Which of the following factors is not considered in a terrestial habitat?

Step 1: Analyze the question We are asked which factor is not considered when studying a terrestrial (land) habitat. So we look for the factor that doesn't apply on land.

Step 2: Explain the concept A terrestrial habitat is a land-based environment, such as a forest, savanna, or desert. Ecologists study its abiotic (non-living) factors, including:

• Temperature: affects the metabolism and distribution of organisms.
• Sunlight (light): drives photosynthesis and influences animal behaviour.
• Humidity: the moisture content of the air, which affects water loss in organisms.
• Others include rainfall, wind, soil type, and topography.

Turbidity is the cloudiness or murkiness of water caused by suspended particles like silt, clay, and plankton. It is a property of water, so it is measured in aquatic habitats such as rivers, lakes, and ponds. It has no meaning in a land habitat.

Step 3: Solution by elimination

• A. Temperature: relevant on land. ❌
• B. Sunlight: relevant on land. ❌
• C. Humidity: relevant on land. ❌
• D. Turbidity: relevant only to water. ✅

Step 4: Answer The correct option is D. Turbidity.

Exam tip: Link the words to their habitats. Turbidity, salinity, dissolved oxygen, and water current point to aquatic habitats. Humidity, wind, and soil type point to terrestrial habitats. Temperature and light apply to both.