Question

1. What are the functions of the cell wall in plant cells?
2. State the reason why do we slip when we step on a banana peel.
3. We add a little curd to warm milk to set curd. Why?
4. Why aluminium foils are used to wrap.food items?​

Answer 1

Answer:

1. The cell wall surrounds the plasma membrane of plant cells and provides tensile strength and protection against mechanical and osmotic stress. It also allows cells to develop turgor pressure, which is the pressure of the cell contents against the cell wall.
2. We slip when we step on a banana peel because the inner side of banana peel being smooth and slippery reduces the friction between the sole of our shoe and the surface of road.
3. Curd contains bacteria Lactobacillus which is added to warm milk to make more curd. This bacteria need suitable temperature for its growth and multiplication that is why warm milk is used. Curd is formed by the chemical reaction between bacteria and milk protein.
4. Aluminium foil has smooth shiny surface. Due to which it reflects back the heat radiation emitted by the food. Hence food remains warm for a longer time.

Hope this could help..

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