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प्रश्न
Cell is the basic unit of life. Discuss in brief.
उत्तर
- The cell is the basic structural and functional building block of all life since, without cells, there could be no living thing. Every life starts off as a single cell.Either a single cell (unicellular) or several cells (multicellular) make up an organism.
- While each group of cells in a multicellular creature is specialised for a particular function, a single cell in a unicellular organism is capable of autonomous existence and may carry out all necessary life processes.
- Cells are the units of life that divide to create new ones, and these cells always come from the division of pre-existing ones.
- Due to the totipotency of cells, a single cell can develop into an entire creature. A cell is the fundamental building block of life since the actions of an organism are the culmination of the activities of its cells.
APPEARS IN
संबंधित प्रश्न
Make a sketch of the human nerve cell. What function do nerve cells perform?
I convert the Sun’s energy into food for the plant. Who am I?______
Assertion (A): Tissue is a group of dissimilar cells.
Reason (R): Muscle is made up of Muscle cell.
Assertion (A): Majority of cells cannot be seen directly with naked eye because.
Reason (R): Cells are microscopic.
Why the cell is very important for us?
On the lines given below, write about what you have learned from the activities done in this lesson.
Let me tell you about some of the important things I’ve learned about cells. First, I’ll start with…______
In Latin, the word ‘cellula’ means a ______.
Analogy:
Smallest cell: virus.
Biggest cell: ______.
Which of the following can be made into crystal?
Which of these options are not a function of Ribosomes?
- It helps in manufacture of protein molecules
- It helps in manufacture of enzymes
- It helps in manufacture of hormones
- It helps in manufacture of starch molecules
Do you agree that “A cell is a building unit of an organism”. If yes, explain why?
Draw a plant cell and label the parts which
- determines the function and development of the cell
- packages materials coming from the endoplasmic reticulum
- provides resistance to microbes to withstand hypotonic external media without bursting
- is site for many biochemical reactions necessary to sustain life. (e) is a fluid contained inside the nucleus
Choose the correct statement with respect to unicellular organisms.
Choose the correct statements.
Identify the correct statement about cells.
Match the terms given in column I with their functions given in column II and fill the blanks given below the table :
| Column I | Column II |
| A. Chloroplast | i) carries hereditary characters |
| B. Cell membrane | ii) controls the activities of cells |
| C. Nucleus | iii) site of photosynthesis |
| D. Chromosome | iv) controls the movement of materials into and out of cells. |
A - ______ ; B - ______ ; C - ______ ; D - ______
Fill in the blanks with the terms given in the box below :
| Nucleus | chromosomes | cell wall | cell membrane | protoplasm | cytoplasm | ribosome | cell organelles |
The outermost layer of plant cells is the __(a)____ beneath which is the __(b)____ The term ___(c)___ refers to the jelly-like substance containing all the ___(d)___ The __(e)____ contains thread-like structures called ___(f)___.
______ first saw and described a live cell.
Give two examples of stains which make the nucleus distinct.
