A) Short Answer
1 . Difference between
a Prokaryotic and Eukaryotic cells
b. Multicelular and Unicellular organisms
2 Draw a well - labelled diagram of a typical cell.
3. Write short notes on
a.plastids
b.Centrosomes
c.Cell membrane
4. Briefly eplain about the nucleus.
5. What are the different stages of cels? Explain with examples.
6. Why is cell division important?
B). Long Answer Questions.
1. With the help of a neat and well-labelled diagram differentiate between plant and animal cells
2. Who proposed the cell theory?
What are ts postulates?
3. How did Robert Hooke discover cels?
4. Explain the process of cell division.
5. List all the cell organelles and describe their Funcions.
6. Why are sosomes called the suicidal bags of the cell?
Answers
prokaryotic cells have primitive nucleus and no double membrane bound organelles while eukaryotic cells have developed nucleus and have double membrane bound organelles .
Explanation:
multicellular organisms are those who have many cells and undergo division of labour and unicellular have single cell.
plastids:-Plastids are double-membrane organelle which are found in the cells of plants and algae. Plastids are responsible for manufacturing and storing of food. These often contain pigments that are used in photosynthesis and different types of pigments that can change the colour of the cell
Centrosomes:-Centrosomes are organelles which serve as the main microtubule organizing centers for animal cells. Centrosomes are made of from arrangement of two barrel-shaped clusters of microtubules, called “centrioles,” and a complex of proteins that help additional microtubules to form.
Cell membrane:-The cell membrane (also known as the plasma membrane (PM) or cytoplasmic membrane, and historically referred to as the plasmalemma) is a biological membrane that separates the interior of all cells from the outside environment (the extracellular space) which protects the cell from its environment.
4. Nucleus:-The nucleus is a membrane-bound organelle that contains genetic material (DNA) of eukaryotic organisms. As such, it serves to maintain the integrity of the cell by facilitating transcription and replication processes. It's the largest organelle inside the cell taking up about a tenth of the entire cell volume.
5:-The cell goes through 4 steps (prophase, metaphase, anaphase, and telophase.) The cells at the end of the process also have the same amount of chromosomes as the parent cell. At the end, 2 cells are produced. Mitosis is used to make body cells, and occurs in the body.
6.Cell division is the process by which a parent cell divides into two or more daughter cells. Cell division usually occurs as part of a larger cell cycle. ... Meiosis results in four haploid daughter cells by undergoing one round of DNA replication followed by two divisions.
7.Credit for developing cell theory is usually given to two scientists: Theodor Schwann and Matthias Jakob Schleiden.
Cell theory states that living things are composed of one or more cells, that the cell is the basic unit of life, and that cells arise from existing cells.
8.When he looked at a thin slice of cork under his microscope, he was surprised to see what looked like a honeycomb. Hooke made the drawing in the figure below to show what he saw. As you can see, the cork was made up of many tiny units, which Hooke called cells.
9.Cell division is the process by which a parent cell divides into two or more daughter cells. Cell division usually occurs as part of a larger cell cycle. ... Meiosis results in four haploid daughter cells by undergoing one round of DNA replication followed by two divisions.
10.when cell gets damaged, lysosome may burst and the enzymes digest their own cell. Therefore lysosomes are known as the Suicidal bags of a cell or we can say that they posses different kind of hydrolases on release of these enzymes that cause death of cell
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