Question

In grasses, the type of cells which help in transpiration and rolling of leaves respectively are

• A. Dumb-bell shaped cells and empty colourless cells
• B. Lenticels and mesophyll cells
• C. Normal epidermal cells and guard cells
• D. Bulliform cells and bean-shaped cells

Answer 1

The correct option is A Dumb-bell shaped cells and empty colourless cells

The dumbbell-shaped cells present in the epidermis of grass leaves are called guard cells. They help in transpiration.

The large, colourless, water filled, hygroscopic, epidermal cells present in the upper epidermis of grass leaves are called Bulliform cells or Motor cells. They involve in the rolling of leaf lamina during dry conditions and unrolling of leaf lamina during wet conditions.

So, the correct option is ‘Dumb-bell shaped guard cells and empty colourless cells.