70-80 % of volume of a mature plant cell is occupied bya)endoplasmic reticulumb)nucleusc)cytoplasmd)vacuoleCorrect answer is option 'D'. Can you explain this answer?

Question

Answer

The mature cell has simple tissues rather than meristematic tissues so they will not divide and plant cell needs vacuole to make itself rigid and various excretion and storage works are also done by the vacuoles.

So, the vacuoles perform majority of the tasks of the plant cell and hence this is the reason, a mature plant cell has 70-80% of vacuoles in them.

Answer

Yes, the correct option is D as the the mature cell has simple tissues rather than meristematic tissues so they will not divide and plant cell needs vacuole to make itself rigid and various excretion and storage works are also done by the vacuoles. So the vacuoles perform majority of the tasks of the plant cell, this is the reason a mature plant cell has 70-80% of vacuoles in them

Answer

Explanation:

The correct answer is option 'D': vacuole.

The vacuole is a large, fluid-filled organelle found in plant cells. It plays a significant role in maintaining the shape and rigidity of the plant cell, as well as storing various substances such as water, ions, sugars, and pigments. The vacuole is surrounded by a membrane called the tonoplast, which regulates the movement of molecules in and out of the vacuole.

Volume of a mature plant cell:
- The volume of a mature plant cell is occupied mostly by the vacuole, which can account for about 70-80% of the total volume.
- The vacuole occupies such a large portion of the cell volume because it expands as it absorbs water, pushing the cytoplasm and other organelles towards the cell wall.

Other organelles in a mature plant cell:
- While the vacuole occupies the majority of the cell volume, other organelles also play important roles:

- Endoplasmic reticulum (ER): The endoplasmic reticulum is a network of membranous tubules and sacs that are involved in protein synthesis, lipid metabolism, and the transport of molecules within the cell. It is present throughout the cytoplasm of the cell, but its volume is relatively smaller compared to the vacuole.

- Nucleus: The nucleus is the control center of the cell and contains the cell's genetic material. It is surrounded by a nuclear membrane and occupies a smaller volume compared to the vacuole.

- Cytoplasm: The cytoplasm is the jelly-like substance that fills the cell and surrounds the organelles. It contains various molecules and structures necessary for cell metabolism and functions. The cytoplasm occupies a smaller volume compared to the vacuole.

Significance of the vacuole:
- The vacuole plays crucial roles in maintaining the turgor pressure of plant cells, which is necessary for plant support and rigidity. It also helps regulate the cell's pH and stores important nutrients and waste products.
- The large volume of the vacuole allows plants to store water, which is important for their survival, especially in arid environments.
- Additionally, the vacuole can also serve as a storage site for pigments, helping plants display vibrant colors.
- Overall, the vacuole's large size and functions make it a significant organelle in plant cells, occupying a substantial volume in the mature cell.

Answer

The mature cell has simple tissues rather than meristematic tissues so they will not divide and plant cell needs vacuole to make itself rigid and various excretion and storage works are also done by the vacuoles.

So, the vacuoles perform majority of the tasks of the plant cell and hence this is the reason, a mature plant cell has 70-80% of vacuoles in them.

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