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Question

Why are angiosperm anther called dithecous? Describe the structure of its microsporangium.

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Solution

  • The anther of androecium of angiospermic flowers are bilobed and each lobe is divided into two parts or theca. Thus, the anther of angiospermic flowers are called dithecous
  • A typical microsporangium is surrounded by four layers - epidermis, endothecium, middle layer and tapetum.
  • The outer 3 layers ie., epidermis, endothecium and middle layer are protective in function and help in dehiscence of anther to release pollen grains.
  • Tapetum (innermost layer) nourishes the developing pollen grains and the cells of tapetum generally have more than one nucleus.
  • When the anther is young, a group of compactly arranged homogenous cells called sporogenous tissue occupy the centre of each microsporangium.

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