Very short answers
1. What is isotonic solution ?
2. What do you mean by selectively permeable membrane ?
3. Why does a cell shrinks down ?
4. What are vacuoles ?
5. Name the organal involved in the formation of lysosomes
Which enzyme is responsible for digestion of proteins? What kind of pH do you think this enzyme needs? How does the stomach maintain this pH? What is another advantage of having such a pH?