Agricultural Biomolecules: Fats, Proteins & Carbohydrates is one of 9 topics in the Grade 11 Agricultural Sciences CAPS syllabus, covered across 3 lessons on Study Vault. Below are real practice questions from this topic with full worked answers.
Sample practice questions
Easy
1. Alkanes are made up only of which two elements?
Carbon and hydrogen
Carbon and oxygen
Nitrogen and hydrogen
Carbon and nitrogen
Answer: Carbon and hydrogen — Alkanes are hydrocarbons made up only of carbon and hydrogen atoms, joined exclusively by single covalent bonds.
Easy
2. What functional group is present in an alcohol that is absent in an alkane?
Answer: hydroxyl group — Alcohols contain a hydroxyl group (-OH) attached to the carbon chain, which is absent in alkanes.
Medium
3. Why are alkanes described as "saturated" hydrocarbons?
Each carbon atom is bonded to the maximum possible number of hydrogen atoms via single bonds
They contain double bonds between carbon atoms
They are always liquid at room temperature
They dissolve completely in water
Answer: Each carbon atom is bonded to the maximum possible number of hydrogen atoms via single bonds — Alkanes are "saturated" because each carbon atom forms only single covalent bonds and is bonded to the maximum possible number of hydrogen atoms, unlike unsaturated compounds which contain double or triple bonds.
