What happens when you add salt in the following cases? Fill up the table with correct answer. Activity Observation Reason 1 . While making potato chips, potatoes are thinly sliced and common salt is sprinkled over them 2 . Excess salt is added to the stem base of a plant 3 . Common salt is sprinkled over freshly cut fish or slice of meat.

Activity Observation Reason 1 . While making potato chips, potatoes are thinly sliced and common salt is sprinkled over them Slice potato shrinks Water is absorbed by the salt from the cells of potato. Activity Observation Reason 2 . Excess salt is added to the stem base of a plant Stem dehydrates Water moves from higher concentration to the lower concentration. The process is called osmosis. Activity Observation Reason 3 . Common salt is sprinkled over freshly cut fish or slice of meat. They shrink Water is absorbed by the salt from the cells and tissues of cut fish or slice of meat.

E M B I B E

Environment and Science Class 7>Chapter 4 - Role of Substances in Environment>Exercise 32

EASY

7th West Bengal Board

IMPORTANT

Earn 100

What is the source of the salt that we use in our daily life?

Important Questions on Role of Substances in Environment

MEDIUM

7th West Bengal Board

IMPORTANT

Environment and Science Class 7>Chapter 4 - Role of Substances in Environment>Exercise 33>Q (a)

Which constituent is mostly present in our body fluid?

MEDIUM

7th West Bengal Board

IMPORTANT

Environment and Science Class 7>Chapter 4 - Role of Substances in Environment>Exercise 33>Q (b)

What happens to sodium chloride, the main constituent of common salt present in our body fluid?

MEDIUM

7th West Bengal Board

IMPORTANT

Environment and Science Class 7>Chapter 4 - Role of Substances in Environment>Exercise 33>Q (c)

What happens to the other components of table salt present in the body?

MEDIUM

7th West Bengal Board

IMPORTANT

Environment and Science Class 7>Chapter 4 - Role of Substances in Environment>Exercise 33>Q (d)

If by any means you cut your lips or bite inside your cheek during eating, have you felt the taste of the blood?

EASY

7th West Bengal Board

IMPORTANT

Environment and Science Class 7>Chapter 4 - Role of Substances in Environment>Exercise 33>Q (f)

It has been found experimentally that

100

millilitre of human blood contains

0.9 g

of sodium chloride. What is the main constituent of human blood?

EASY

7th West Bengal Board

IMPORTANT

Environment and Science Class 7>Chapter 4 - Role of Substances in Environment>Exercise 34

What happens when you add salt in the following cases? Fill up the table with correct answer.

Activity	Observation	Reason
$1$ . While making potato chips, potatoes are thinly sliced and common salt is sprinkled over them
$2$ . Excess salt is added to the stem base of a plant
$3$ . Common salt is sprinkled over freshly cut fish or slice of meat.