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5. Disadvantages... 1- Synthetic fibres do not absorb water or sweat. In hot and humid weather therefore the clothes made of synthetic fibre stick to the body and make the wearer uncomfortable. 2- Synthetic fibres melt and burn easily. 3- Synthetic fibres on catching fire shrink forming beads which stick to the skin.
6. a) nuclear membrane is a double membrane that encloses the cell nucleus. It serves to separate the chromosomes from the rest of the cell. The nuclear membrane includes an array of small holes or pores that permit the passage of certain materials, such as nucleic acids and proteins, between the nucleus and cytoplasm
b) threadlike structure of nucleic acids and protein found in the nucleus of most living cells, carrying genetic information in the form of genes.
c) A vacuole is a membrane-bound organelle which is present in plant and fungal cells and some protist, animal, and bacterial cells.