Which of the following scientists coined the term 'cell'?

The process of selective movement of substances through semi-permeable membrane is called

When an animal cell is placed in hypotonic solution, it

Which of the following maintains the basic structure (shape) of the plant cell after shrinkage of the cell content during plasmolysis?

Plasmolysis occurs due to

The primary function of leucoplasts is ..............................

The large central vacuole of plant cells helps to maintain the .............................of the cell.

The cells which do not have membrane-bound organelle are called ...........................cells.

The term 'protoplasm' for the fluid substance of the cell was coined by ............................

CO₂ moves out of the cell, from a region of high concentration to a region of low concentration outside the cell by the process of .............................

What will happen if an animal or plant cell is put into a solution of sugar and water?

Who discovered cells and how?

Our body is formed of millions of cells. Now, you can imagine how minute the cells are.We cannot see unicellular bacteria or our cheek cell without the help of microscope.We can see a type of cell with naked eye. These are shelled eggs, for example, egg of a hen. Eggs of a bird after hatching give rise young ones (chick).
With this information, answer the following questions:
(i) Egg of which bird is biggest?
(ii) Why is it said that take one egg daily?
(iii) Why should we not eat more eggs daily for a long period?
(iv) What is your duty after getting this information?

Differentiate between diffusion and Osmosis.

State three differences between plasma membrane and cell wall.

Water forms two-thirds of the weight of the body. Body cells contain about 60% to 70% of water.All life processes carried out in a cell require water medium.It is essential to well being, deprivation or loss of water, as in case of diaohrrea, dysentry, vomiting etc. is more immediately serious than of any other article in diet.On the basis of above information answer the following questions:
(i) What first aid you will provide to a patient who has lost sufficient water from the body cells due to loose motions?
(ii) How would you prepare the solution to hydrate the body cells of the patient?
(iii) What would you do for the community with this information?

Describe the role played by the lysosomes in the cell. Why are these termed as suicidal bags? How do they perform their function?