Epidermal cell of onion bulb: Cell Y*

a)

• (i) Epidermal cell of onion bulb: Cell Y
• (ii) Cheek cell: Cell X

b)

• The Cell membrane is semi-permeable membrane enclosing cell contents. Its function is controlling the movements in and out of the cells.
• The jelly-like substance in which chemical processes are carried out in the cells above is Cytoplasm. Mitochondrion is an organelle where food is broken down to release energy in the cells, a process called respiration.
• Nucleus controls all the activities taking place within the cells.

c)

• (i) Q: Cell wall
• (ii) R: Mitochondrion

d)

• (i) Q (Cell wall): Provides structural support and protection to the plant cell. It also gives the cell its fixed shape.