Question

i.
Name the constituent of cell wall along with its one function.
ii. How does amoeba acquire its food?
iii. Mention one significance each of
diffusion and osmosis.
iv. Why do we call cell membrane selectively
permeable membrane?​

Answer 1

Answer:

1. Composition. In the primary (growing) plant cell wall, the major carbohydrates are cellulose, hemicellulose and pectin. The cellulose microfibrils are linked via hemicellulosic tethers to form the cellulose-hemicellulose network, which is embedded in the pectin matrix.
2. Amoeba envelops its food through the process of endocytosis or phagocytosis, where pseudopodia is created by flexibility of the plasma membrane. ... Inside the food vacuole, complex substances are broken down into simpler ones which then diffuse into the cytoplasm.
3. Osmosis is important for the cells for many reasons. It helps in the movement of important materials inside and out of the cell. The nutrients, water and other solutes move in and out of the cell by the process of osmosis.

• Diffusion is important to organisms because it is the process by which useful molecules enter the body cells and waste products are removed. The intestines. Digested food molecules (amino acids, glucose) move down a concentration gradient from the intestine to the blood.

4. Plasma membrane allows some materials to pass through it while blocks other materials from entering through it. So, cell membrane is called selectively permeable.

Answer 2

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