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Ncert Solution | Ncert Solution for class 9th | NCERT solutions for Class 9 Science | NCERT SOLUTIONS FOR CLASS 9 SCIENCE CHAPTER 5 THE FUNDAMENTAL UNIT OF LIFE
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NCERT Solutions For Class 9 Science Chapter 5 The Fundamental Unit of Life

NCERT Solutions For Class 9 Science Chapter 5 The Fundamental Unit of Life are prepared by CBSE student eCARE expert to score good marks in class 9. This chapter contain many topics which are very important to score good in class 9. There are some important topic/Activity mentioned below- 

Topics and Sub Topics in Class 9 Science Chapter 5 The Fundamental Unit of Life:

  1. The Fundamental Unit of Life
  2. What are Living Organisms Made Up of?
  3. What is a Cell Made Up of? What is the Structural Organisation of a Cell?



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Some questions are asked by class 9 students related to Science

1. Who discovered cells, and how?

Solution:

in 1665, Robert Hooke discovered cells while examining a thin slice of cork through a self-designed microscope. He observed that the cork resembled the structure of a honeycomb consisting of numerous tiny compartments. The minuscule boxes are referred to as cells.

2. Why is the cell called the structural and functional unit of life?

Solution:

Cells form the structure of an entity. A group of cells form a tissue, further an organ and ultimately an organ system. They perform fundamental functions and life processes such as respiration, digestion, excretion etc in both unicellular and multicellular entities. They perform all the activities independently. Hence, cells are referred to as structural and fundamental units of life.

3. How do substances like CO2 and water move in and out of the cell? Discuss.

Solution:

CO2 moves by diffusion – These cellular waste accumulates in high concentrations in the cell, whereas the concentration of CO2 in the external surroundings is comparatively lower. This difference in the concentration level inside and out of the cell causes the CO2 to diffuse from a region of higher(within the cell) to a lower concentration.

H2O diffuses by osmosis through the cell membrane. It moves from a region of higher concentration to a lower concentrated region through a selectively permeable membrane until equilibrium is reached.

4. Why is the plasma membrane called a selectively permeable membrane?

Solution:

The plasma membrane is called as a selectively permeable membrane as it permits the movement of only a certain molecules in and out of the cells. Not all molecules are free to diffuse.