Q1.Differentiate between the 3 simple permanent tissues found in plants. Question2. What makes plant cells more rigid than animal cells? Why do they need to be more rigid? Question2. What would happen if lysosome was not bound by a membrane? Question3. Diagrammatically show the position of three meristems. Question4. Differentiate between nucleoid and nucleus. What are their functions? Question5. A cell type has to release large amounts of protein and lipids into the extra cellular space. Which organelles will be found in high amounts in this cell type and why? Question6. Concentration of oxygen is more outside the cell as compared to inside. Will the oxygen concertation inside and outside change with time? If yes, where will it increase? If no, why not?
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ans2-Plant cells have a cell wall, a large central vacuole, and plastids such as chloroplasts. The cell wall is a rigid layer that is found outside the cell membrane and surrounds the cell, providing structural support and protection. The central vacuole maintains turgor pressure against the cell wall.
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ans 1
parenchyma: they store food , have intercellular space , live cell
collenchyma : they r living cell , they have some chloroplast
sclerenchyma : dead cell , they r long , they have thick walls
ans 2
The plant cells are more rigid compared to animal cells as they have cell wall.It provides rigidity as well as protection from outer environment.As plants are immovable they are more exposed to environmental hazards, therefore a protective covering is required. Cell wall is the outer most covering of the plant cell. Then comes the cell membrane. Due to presence of this cell wall they are protected from external injury and also remain alive in extreme temperatures. Even if the cell loses water, becomes plasmolysed, they can remain alive due to presence of cell wall and with regain of water they can become normal. Similarly, when excess water enters cell, the plant cell swells but it do not burst due to presence of wall pressure.ans 3
Lysosome contains very powerful enzymes which can eat up other organelles.So if lysosome was not bound by a membrane,it would have destroyed all the other organelles and eventually the cell.
hope it help
parenchyma: they store food , have intercellular space , live cell
collenchyma : they r living cell , they have some chloroplast
sclerenchyma : dead cell , they r long , they have thick walls
ans 2
The plant cells are more rigid compared to animal cells as they have cell wall.It provides rigidity as well as protection from outer environment.As plants are immovable they are more exposed to environmental hazards, therefore a protective covering is required. Cell wall is the outer most covering of the plant cell. Then comes the cell membrane. Due to presence of this cell wall they are protected from external injury and also remain alive in extreme temperatures. Even if the cell loses water, becomes plasmolysed, they can remain alive due to presence of cell wall and with regain of water they can become normal. Similarly, when excess water enters cell, the plant cell swells but it do not burst due to presence of wall pressure.ans 3
Lysosome contains very powerful enzymes which can eat up other organelles.So if lysosome was not bound by a membrane,it would have destroyed all the other organelles and eventually the cell.
hope it help
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