Tag: structural organization in living organisms

Questions Related to structural organization in living organisms

Why do plant cells possess large sized vacuole?

biology structural organization in living organisms structure of a plant cell levels of organisation in plants plant and animal cell

  1. Storage

  2. Dumping of cellular wastes

  3. Maintaining turgidity in a cell

  4. All of the above

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Correct Option: D
Explanation:

Vacuoles are like storage bubbles which are found mostly in plant cells. They occupy most of the portion of plant cells. These are used for storage of food or water. They also store toxic metabolic by-products or end products of plant cells. Such vacuoles are thrown out of the cell by exocytosis. Osmotic pressure and turgidity are maintained by vacuoles due to the presence of cell sap. 

The plant cell lacks 

biology structural organization in living organisms structure of a plant cell levels of organisation in plants plant and animal cell

  1. Centriole and aster

  2. Asters

  3. Centriole

  4. Microtubules

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Correct Option: A
Explanation:

Centrosomes are the cellular organelles which are involved in the formation of centrioles. The centrioles are the centres for the formation of the microtubules required for the spindle fibres formation during cell division. The aster is the star-like formation around the centriole. This is the region from where the spindle fibres get distributed in all the sides. The centrioles and aster are present in the animal cells and absent in the plant cells. Thus, the correct answer is option A. 

The cellulosic cell wall is essential for plant cell because 
(a) It gives shape to the cell.
(b) It gives protection to the cells.
(c) It is able to withstand high temperature, high wind speed and atmospheric moisture.
(d) It is involved in the recognition of substances required for the cells.

biology structural organization in living organisms structure of a plant cell levels of organisation in plants plant and animal cell

  1. a, b, and d

  2. a, c and d

  3. b, c and d

  4. a, b and c

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Correct Option: D