1. Structure of which molecule is not tetrahedral?
A. CCl4B. NH + 4C. BH − 4D. SF4
2. What type is the endosperm of gymnosperm plants?
A. HaploidB. DiploidC. TriploidD. Aneuploid
3. Which of the mouthparts of a grasshopper contains glossa and paraglossa?
A. MandibleB. MaxillaC. HypopharynxD. Labium
4. Choose the appropriate preposition: They provided us___ food and drink.
A. forB. withC. aboutD. to
5. If the temperature decreases, the resistance of a semiconductor-
A. DecreasesB. IncreasesC. Remains unchangedD. Becomes zero
6. What is produced by breaking down glucose in anaerobic respiration?
A. and ethanol CO2B. and CO2 H2OC. Ethanol and H2OD. Formic acid and H2O