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The Fundamental Unit of Life CBSE Class 9

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The Fundamental Unit of Life Topics

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Question 1/20

Q 1. Movement of water into cells is called

Solution

Movement of water into cells is called endosmosis. 

Q 2. _______ is the simplest biological structure which cannot be sub-divided into further simpler, standalone units.

Solution

Cell is the basic structural and fundamental unit of life. 

Q 3. In an experiment based on osmosis, raw eggs are preferred over boiled eggs because

Solution

Raw eggs are living cells and exchange of materials takes place in living cells. 

Q 4. What is your observation when a raw deshelled egg is placed in a sugar solution?

Solution

When a raw deshelled egg is placed in a sugar solution, it shrinks. 

Q 5. A mitochondrion is bounded by _______ membranes.

Solution

A mitochondrion is a double membrane cell organelle. 

Q 6. Water in a water purifier is purified using the technology of

Solution

Water purifiers purify water using the technology of reverse osmosis. 

Q 7. ____________ is a large network of membrane-bound tubes and sheets.

Solution

Endoplasmic reticulum is a large network of membrane-bound tubes and sheets. 

Q 8. ________ are non-membrane bound organelles present in all prokaryotic cells.

Solution

Ribosomes are non-membrane bound organelles present in all prokaryotic cells. 

Q 9. Chromosomes are present in the

Solution

Chromosomes are present in the nucleus of the cell. 

Q 10. ____________ solution contains higher water concentration than that in the cell.

Solution

Hypertonic solution contains higher water concentration than that in the cell. 

Q 11. Which of the following organisms is unicellular and eukaryotic?

Solution

Paramoecium is unicellular and eukaryotic in nature. 

Q 12. The plasma membrane is said to be

Solution

The plasma membrane allows the entry and exit of certain solutes; hence, it is said to be semi-permeable. 

Q 13. Anton Von Leeouwenhoek called cells

Solution

Anton Von Leeouwenhoek called cells animalcules. 

Q 14. Which of the following does not pass easily through a selectively permeable membrane?

Solution

Molecules such as glucose and sucrose do not pass easily through a selectively permeable membrane. 

Q 15. Hair-like projections on the surface of a prokaryotic cell are called

Solution

Fimbriae are small, hair-like projections on the surface of a prokaryotic cell. 

Q 16. Living cells were observed for the first time by

Solution

Living cells were observed for the first time by Anton Von Leeouwenhoek in 1964. 

Q 17. Which of the following cell structures in a prokaryotic cell help in locomotion?

Solution

Flagellae in a prokaryotic cell help in locomotion. 

Q 18. The plant cell wall is mostly composed of

Solution

The plant cell wall is mostly composed of cellulose. 

Q 19. An ostrich egg is ________ in diameter.

Solution

An ostrich egg is 16 cm in diameter. 

Q 20. Which of the following cells is visible to the naked eye?

Solution

Ostrich egg is 17 cm in diameter and hence can be easily seen with the naked eye. 

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