Explain how do cell walls permit the cells of fungi to withstand very dilute external media without bursting.
Q.1. Explain how do cell walls permit the cells of fungi to withstand very dilute external media without bursting.
Ans. Fungi withstand very dilute/hypotonic external media without bursting because of their cell walls. In such media, the cells swell by taking up water by osmosis and thus building up pressure against the cell wall. The wall exerts an equal pressure against the swollen cell.
Q.2. Name the scientist who discovered cells. List any two single-celled (unicellular) organisms.
Ans. Robert Hooke.
(i) Amoeba, (ii) Paramecium.
Q.3. What type of enzymes are present in the lysosomes ? What is their function? Which cell organelles manufacture these enzymes ?
Ans.
(i) Lysosomes contain the powerful digestive enzymes.
(ii) These enzymes are capable of breaking down all organic material thus, they help to keep the cell clean by digesting any foreign material as well as worn out cell organelles.
(iii) Rough endoplasmic reticulum manufactures these enzymes.
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