Bio f5 chap 1

Question 1

Explain the differences of parenchyma, collenchyma and sclerenchyma tissues.

Answer 1

• Parenchyma tissue is the simplest living cell and do not undergo differentiation. 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 2

How do secondary growth supports primary growth in plants?

Answer 2

• increases the diameter or circumference of plant stems
• the more growth, the more vascular and cork tissues