Question

1. Identify the figure. What is its function?
2.  Label V and W.
3. Label X, Y and Z.
4. W loses its nucleus in the mature state, still it remains alive. Explain how?

Answer 1

1. The figure shows phloem tissue, which transports prepared food through the plant.
2. V - phloem parenchyma; W - sieve-tube element.
3. X - sieve plate; Y - companion cell; Z - sieve pores.
4. A mature sieve-tube element remains alive because its associated companion cell supports its functioning. The two cells are connected by plasmodesmata and arise from the same mother cell.