Which ocean is smallest? A. Atlantic B. Indian C. Arctic D. Pacific Explanation: Arctic Ocean is smallest.
Which boundary forms mountains? A. Divergent B. Convergent C. Transform D. Rift Explanation: Compression uplifts mountains.
Which rock is intrusive igneous? A. Basalt B. Granite C. Sandstone D. Slate Explanation: Granite forms underground.
Which gas contributes to ozone depletion? A. CO₂ B. CFC C. N₂ D. O₂ Explanation: CFCs release chlorine radicals.
Which biome is driest? A. Desert B. Rainforest C. Tundra D. Grassland Explanation: Deserts have minimal precipitation.
Which blood vessel carries oxygenated blood? A. Vein B. Artery C. Capillary D. Venule Explanation: Arteries carry oxygen-rich blood (except pulmonary).
Which phase of cell cycle duplicates DNA? A. G1 B. S C. G2 D. M Explanation: DNA synthesis occurs in S phase.
Which organelle modifies proteins? A. Ribosome B. Golgi C. Lysosome D. Nucleus Explanation: Golgi processes and packages proteins.
Which process converts DNA to RNA? A. Translation B. Transcription C. Replication D. Mutation Explanation: Transcription synthesizes RNA.
Which structure controls gene expression? A. DNA B. RNA C. Protein D. All Explanation: Regulation involves DNA, RNA, and proteins.