Habitats are generally classified into

1. Analyze the question The question asks how habitats are generally classified. A habitat is the place where an organism lives, so the classification should be based on the type of environment.

2. Explain the concept A habitat is the natural home of an organism. The broadest classification is based on whether the environment is water or land:

• Aquatic habitats: water-based, such as ponds, rivers, lakes, seas, and oceans. These are further divided into freshwater, marine, and brackish (estuarine) habitats.
• Terrestrial habitats: land-based, such as forests, savannah, deserts, and grasslands.

3. Step-by-step evaluation of the options

• A. Biotic and abiotic: These are factors (components) of an ecosystem, not types of habitat. Biotic means living things, and abiotic means non-living things such as temperature, light, and soil. ❌
• B. Aquatic and terrestrial: This is the standard primary classification of habitats, by water or land. ✅
• C. Aboreal and marine biomes: "Arboreal" (tree-dwelling) is a type of microhabitat, and "marine" is only one kind of aquatic habitat. The two are not parallel categories, and the question is about habitats, not biomes. ❌
• D. Microhabitats and macrohabitats: These describe the scale of a habitat, such as a rotting log versus a whole forest. They are not the general classification. ❌

4. Answer The correct option is B. aquatic and terrestrial.

5. Exam tip Remember the keyword "habitat" = "home." An organism's home is either in water (aquatic) or on land (terrestrial). If you see "biotic/abiotic" in an option, it usually refers to factors, not habitats.