The outermost boundary in most of the leaf cell is:
Correct answer: A. Cell wall
- A. Cell wall
- B. Cell membrane
- C. Tonoplast
- D. Unit membrane
- E. Polar substances
Explanation
Option A: The outermost boundary of most leaf cells is the cell wall. It is a rigid layer that surrounds the cell membrane and provides support and protection for the cell. It is made up of cellulose, a long-chain carbohydrate. The cell wall is not present in animal cells. Option B: The cell membrane is the outermost boundary of all cells, but it is not the outermost boundary of most leaf cells. Option C: The tonoplast is the membrane that surrounds the vacuole, which is a large organelle found in plant cells. It is not the outermost boundary of the cell. Option D: A unit membrane is a single layer of phospholipids that forms the basic structure of all cell membranes. It is not the outermost boundary of any cell. Option E: Polar substances are molecules that have a positive and negative end. They are not boundaries of cells.
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Animal, plant, prokaryotic and eukaryotic cells are compared through their membranes, cell walls, nuclei and cytoplasmic organelles. The work includes the structures and functions of mitochondria, chloroplasts, ribosomes, endoplasmic reticulum, Golgi apparatus and lysosomes, as well as chromosome organization and the distinction between chromatin and chromosomes.
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