Question

Explain structure of a leaf in detail. (5 Marks)

Answer 1

• A leaf has a stalk called petiole. The flat portion of the leaf is called leaf lamina or leaf blade. (1 Mark)
• On the lamina, there is a main vein called midrib. Other veins are branchout from mid rib. (0.5 Marks)
• The portion of the leaf connected in the nodal region of the stem is known as the leaf base. (0.5 Marks)
• Leaves of some plants possess a pair of lateral outgrowth on the base, on either side of auxiliary bud. These are called stipules. (1 Mark)
• The green colour of the leaf is due to the presence of green coloured pigment called chlorophyll. (0.5 Marks)
• On the lower side of the leaf there are tiny pores or openings known as stomata. (0.5 Marks)
  (1 Mark)