Question

The diagram below represents a layer of epidermal cells showing fully grown root hair. Study the diagram and answer the questions that follow: 

 

1. Name the parts labelled A, B, C and D.
2. The root hair cell is in a turgid state. Name and explain the process that caused this state.
3. Mention one distinct difference between the parts labelled A and B.
4. Draw a diagram of the above root hair cell as it would appear when a concentrated solution of fertiliser is added near it.

Answer 1

1. A:  Cell wall
   B: Cell membrane
   C: Cytoplasm
   D: Nucleus
2. Endosrosis: The turgor pressure is produced when water from the ground enters the root hair and turns it turgid.
3. Whereas the cell membrane of a root hair is semi-permeable and does not enable large dissolved salt molecules to pass through, the cell wall of a root hair is freely permeable and lets both salt and water flow through.
4.