Food items like jams and pickles are protected by using ………….

How do interferéns protect us?

Fire was first used for protection and cooking by

Name two food items and two medicines that may cause an allergy. What reactions do they trigger in the alimentary canal?

Shyam went to a grocery shop to purchase some food items . The shopkeeper packed all the items in polythene bags and gave them to Shyam . But Shyam refused to accept the polythene bags and asked the shopkeepers to pack the items in papar bags . He informed the shopkeeper about the heavy penalty imposed by the government for using polythene bags . The shopkeeper promised that he would use paper bags in future in place of polythene bags. Answer the following : (a) Write the values (at least two) shown by Shyam . (b) Write one structural difference between low-density polythene and high-density polythene . (c) Why did Shyam refuse to accept the items in polythene bags ?

In Pickles, jams and jellies, the invaded bacteria die due to

Assertion : Chemicals added to foods for increasing their shelf life are called preservatives. Reason : Natural sweetners like sucrose and artificial sweetners like saccharin are commonly used as food preservatives.

How is the intestinal mucosa protected from the acidic food entering from stomach ?

(a) Why are the colourful polysterene and plastic packaging used for protecting the food, considered an environmental menace? (b) Write about the remedy found for the efficient use of plastic waste by Ahmed Khan of Bangalore.

(a) Why are the colourful polysterene and plastic packaging used for protecting the food, considered an environmental menace? (b) Write about the remedy found for the efficient use of plastic waste by Ahmed Khan of Bangalore.

Assertion: Detritus food chain begins with decomposers. Reason: Detrivores, like fungi and bacteria, are major decomposers in such food chains.