Biology · SEXUAL REPRODUCTION IN FLOWERING PLANTS

Consider the following statements regarding the structure of a typical stamen and anther: (a) The proximal end of the filament is attached to the thalamus or the petal of the flower. (b) A typical angiosperm anther is dithecous and bilobed. (c) The anther is a tetragonal structure consisting of two microsporangia, one in each lobe. (d) The microsporangia develop further and become pollen sacs extending longitudinally through the anther. Which of the above statements are correct?

1. (a), (b) and (d) only
2. and (c) only
3. (b), (c) and (d) only
4. (a), (b), (c) and (d)