Question

Provide scientific term: (a) The parenchyma cells that maintain the pressure gradient in sieve tubes. (b) Large, empty, colourless cells found in adaxial epidermis of grass leaf.

Answer 1

b) leucoplast is large, empty ,colorless cells found in adaxial epidermis of grass leaf.

Answer 2

Pressure gradient in the sieve tubes is maintained by. (A)companion cells. (B)phloem fibres. (C)phloem parenchyma.

In grasses, certain adaxial epidermal cells along the veins modify themselves into large, empty, colourless cells. These are called bulliform cells. When the bulliform cells in the leaves have absorbed water and are turgid, the leaf surface is exposed.