Which biome is hottest? A. Tundra B. Desert C. Forest D. Grassland Explanation: Deserts have extreme heat.
Which blood cells carry oxygen? A. WBC B. RBC C. Platelets D. Plasma Explanation: Red blood cells transport oxygen.
Which organ produces insulin? A. Liver B. Pancreas C. Kidney D. Heart Explanation: Pancreas secretes insulin.
Which stage divides cytoplasm? A. Mitosis B. Cytokinesis C. Interphase D. Prophase Explanation: Cytokinesis splits cytoplasm.
Which molecule carries oxygen in muscle? A. Hemoglobin B. Myoglobin C. Collagen D. Keratin Explanation: Myoglobin stores oxygen in muscle.
Which enzyme breaks starch? A. Lipase B. Amylase C. Protease D. Nuclease Explanation: Amylase digests starch.
Which functional group is alcohol? A. -COOH B. -OH C. -NH₂ D. -CHO Explanation: Alcohols contain hydroxyl group.
Which compound has trigonal planar geometry? A. NH₃ B. CH₄ C. BF₃ D. H₂O Explanation: BF₃ is sp² hybridized.
Which reaction releases electrons? A. Reduction B. Oxidation C. Neutralization D. Precipitation Explanation: Oxidation is loss of electrons.