Biology

What does the microsporangia develop into?

• Pollen grain

• Pollen tube

• Pollen sac

• Pollen mother cell

In a trnsverse section, a typical microsporangium appears in outline as

• Rectangular

• Longitudinal

• Circular

• Oval

Identify the homogeneous group of cells which occupy the centre of each microsporangium.

• Nucellus

• Synergid cells

• Sporogenous tissue

• Megaspore mother cell

This layer has a role in nourishing the developing pollen grains. Identify the layer.

After meiotic divisions, what do the cells of the sporogenous tissue form?

The microspores ultimately dissociate from each other to form

The .............. represent the male gametophyte

• Stamen

• Pollen grains

• Pollen sac

• Anther

The appertures on the pollen grain exine where sporopollenin is absent is called...................

The intine of pollen grain is a thin layer made up of ......... and ........

In over 60% angiosperms pollen grains are shed at this stage........

• 3 celled

• 2 celled

• 7 celled 8 nucleate

• 8 celled 7 nucleate