Formative Practice 1.1 (Form 5 Biology Textbook Exercise and Answer)

Question 1:
State an example of cell modified from epidermal cells.

Guard cell / Root hair cell

Question 2:
Explain the differences of parenchyma, collenchyma and sclerenchyma tissues.

• Parenchyma tissue is the simplest living cell and do not undergo differentation. Collenchyma tissue is made of living cells which mature into cells that are flexible. Sclerenchyma tissues consists of dead cells when matured.

• Parenchyma tissue has the thinnest cell wall. The cell wall of collenchyma tissue is thicker than the parenchyma tissue. The cell wall of sclerenchyma tissue is the thickest among the three ground tissues.

• Parenchyma tissue are involved in photosynthesis, help in the storage of starch and sugar, and involved in gaseous exchange. Collenchyma tissues provide mechanical support and elasticity to plants. Sclerenchyma tissues provide support and mechanical strength to the parts of matured plants.

Question 3:
How is the structure of xylem adapted to its functions?

Xylem is made up of dead cells without cytoplasm. Xylem consists of xylem vessels that are elongated, hollow and connected to each other from the roots to the leaves. This enables xylem to transport water and mineral salt to all parts of the plant.

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