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Lv 4
? asked in 科學及數學生物學 · 1 decade ago

F.4 biology (urgent)

1. Explain the following cases.

(a) The egg stains on clothes can be removed by biological washing powder.

(b) Some vegetable sellers in the markets spray water over the vegetables when they are selling

1 Answer

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  • 1 decade ago
    Favorite Answer

    1.(a) It is because biological washing powder contains protesase (an enzyme) that can digest proteins. So it can help to remove the stains on clothes.

    b.) I am not sure the answer. But may be

    Vegetables contains a lot of water, but if they expose in air for a long time, they become dry and appear dull in colour. In order to make them look fresh, the seller spray water over the vegetables.

    Hope can help u THX!

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