Which current is cold? A. Gulf Stream B. Kuroshio C. Humboldt D. Agulhas Explanation: Humboldt current is cold.
Which boundary spreads plates apart? A. Convergent B. Divergent C. Transform D. Subduction Explanation: Plates move away at divergent boundaries.
Which rock is extrusive? A. Granite B. Basalt C. Marble D. Slate Explanation: Basalt forms from lava.
Which biome has seasonal rainfall? A. Desert B. Savanna C. Tundra D. Polar Explanation: Savanna has wet and dry seasons.
Which blood component clots? A. RBC B. WBC C. Platelets D. Plasma Explanation: Platelets initiate clotting.
Which phase of meiosis involves crossing over? A. Prophase I B. Metaphase II C. Anaphase I D. Telophase II Explanation: Homologous recombination occurs in prophase I.
Which organelle synthesizes lipids? A. Rough ER B. Smooth ER C. Ribosome D. Lysosome Explanation: Smooth ER produces lipids.
Which enzyme converts glucose to glucose-6-phosphate? A. Hexokinase B. Ligase C. Amylase D. Lipase Explanation: First step of glycolysis.
Which orbital hybridization is tetrahedral? A. sp B. sp² C. sp³ D. dsp² Explanation: sp³ gives tetrahedral geometry.