Q1 of 360 Page 119

How does a cell show division of labour? Is there any parallelism between working of the cell and our society?

A cell consists of several organelles like plasma membrane, mitochondria, endoplasmic reticulum, ribosomes, Golgi apparatus lysosomes, vacuoles etc. Every cell organelle performs specific functions. For example – plasma membrane controls the entry and exit of vital molecules, chloroplasts synthesize food, ribosomes help in protein synthesis, mitochondria convert glucose into energy etc. This shows that there is division of labour in a cell. Likewise, human society also has specific set of people to perform specific tasks. For example- police and security personnel’s control entry and exit of people in the city, city planners design and develop the infrastructure of a city. In this way masons, electricians, carpenters, plumbers, transporters scavengers, traffic controllers, teachers, doctors, farmer, shopkeepers, managers, security persons, all have some specialised job/ task to do for the human society.


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3

Give an illustrated account of nucleus.

 4

Write short note on the following:

(a) Golgi apparatus (b) Mitochondria

 2

Khushi wanted to eat rice and kidney bean (rajmah). She requested her mother to cook the same for lunch tomorrow. At night her mother took a cup of kidney bean and put them in a container having some water. She kept the container covered overnight. Next morning, she cooked rice and kidney beans for lunch. Khushi inquired her mother the following questions:

(i) Why dis dhe soak jkidney beans in water overnight?


(ii) Name the scientific phenomenon involved in above process.


(iii) name atleast one more food item that is cooked in this way.

 3

One day Muskan saw her mother making pickle. Her mother cut the carrots, turnip and cauliflowers into small pieces, washed them and put them in the sun for few hours. Thereafter, she mixed common salt, oil, paste of onion, ginger and garlic, gur, red chilli, turmeric powder, acetic acid, etc. As per requirement with the cut vegetables and heated them. After cooling, she put the contents in the air tight jar and kept it in the sun for many days.

(i)Why did Muskan’s mother cur the vegetables into small pieces and put them in the sun for few hours?


(ii) Why did she mix common salt in the cut vegetables and heated it? Name the process involved.


(iii) Why did she mix acetic acid?