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प्रश्न
Define the term cell? Also, describe types of cells.
उत्तर
Cell is the smallest structural and functional unit of all living organisms and is a membrane bound structure enclosing the protoplasm.
The two types of cells are:
- Prokaryotic cells – These cells lack a well-organised nucleus and membrane bound organelles. They are usually found in unicellular organisms, which are referred to as prokaryotes. Examples of prokaryotes are bacteria and blue-green algae.
- Eukaryotic cells – These cells possess a well-organised nucleus and membrane bound organelles. Organisms made up of eukaryotic cells are called eukaryotes. Examples of eukaryotes are plants and animals.
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संबंधित प्रश्न
A plant cell has a cell wall made of :
Name the part of the cell concerned with the following :
Transmission of hereditary characters from parents to offspring
Match the name of the organelle given in Column A with its function given in Column B.
| Column A (Organelle) | Column B (Function) | ||
| 1 | leucoplast | a | help in cell division |
| 2 | nucleus | b | transport of material |
| 3 | ribosomes | c | making food |
| 4 | mitochondria | d | digesting foreign bodies |
| 5 | endoplasmic reticulum | e | storage of starch and proteins |
| 6 | golgi bodies | f | making the cell turgid |
| 7 | chloroplast | g | making proteins |
| 8 | centrosome | h | controlling all the vital activities of a cell |
| 9 | vacuole | i | releasing energy |
| 10 | lysosomes | j | synthesis of cell wall in a plant cell |
Write true or false for each statement. Rewrite the false statements correctly:
The size of a cell is usually measured in centimetres
Write a short answer.
What is the relationship between growth and cell division?
What was the contribution of the following to our knowledge of cells?
Robert Hooke
Fill in the blank with a suitable word:
The single-celled alga ______ measures 10 cm in length.
Sketch and describe in your own words, the animal cell
Answer the following question.
Who discovered cells, and how?
