Uses of Common Salt

Q. Salt and sugar have been used for centuries as food preservatives. Salt is used to preserve meat because ___________.

1. It betters the taste of the meat and is nutritious
2. It increases the moisture content and thus increases nutrients
3. It promotes multiplication of beneficial bacteria that prevent food spoilage.
4. It kills the harmful microbes by drawing moisture to prevent their growth

Q.

The filled packets in which food items such as chips are sold are usually filled with nitrogen . How do you think that helps?

Answer: this is because the nitrogen present in the seal packets of chips prevent the growth of microorganism and acts as a preservator to preserve food.

Could you please check whether the above answer is correct

Q.

Name two food materials which are presereved by using common salt.

Q.

Fill in the following blanks with suitable words:

(a) Alcohol is produced with the help of _________

(b) Blue -green algae fix______directly from air to enhance fertility of soil.

(c) Micro-organisms can be seen with help of a______

(d) Cholera is caused by______

(e) Common salt has been used to preserve______ and ______for ages.

(f) The food material which is preserved by pasteurisation is ______

(g) As a result of nitrogen cycle, the percentage of nitrogen in the atmosphere remains more or less.______

Q. ___ is always added to pickles to preserve it for a long time.

Q. Salt is added to meat or pickles to preserve it. Why? (3 marks)

Q.

Suggest a suitable word for each of the following statements.

1. Chemicals added to food to prevent the growth of microorganisms.
2. Nitrogen-fixing microorganisms are present in the root nodules of legumes.

Q.

How are viruses extracted using suitable buffers?

Q. ___ is almost always added to pickles to preserve it for a long time.

Q. ___ is almost always added to pickles to preserve it for a long time.

Q. The sealed packets in which food items such as chips are sold are usually filled with nitrogen. How do you think that helps?

Q. ___ is almost always added to pickles to preserve it for a long time.

Q. ___ is almost always added to pickles to preserve it for a long time.